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Bullae: 44, Apiophora paulseni Philippi; 45, Dolicliottaster brevicornis (Wiedemannj; 46, Eumydas corwpas, gen. n., sp, n.: 47, Messiasia pertenuis (Johnson); 48, Midacritus stuardoanue Seguy: 49, Mitrodetus dentitarsis (Macquart); 50, Opomudas atiuimus Seguy; 51, Mydas lividus Curran; 52, Nemomydas venosus (Loew); 53, Parctmydas igniticornis (Bigot); 54, Phyllomydas scitulus (Wiltiston): 55, Pluomudas peruviensis, gen. n., sp. n.; 56, Pseudo nomoneura hirta (Coquillett): 57, Pseudorliopalui mirandai (d'Andretta & Carrera). in The American Genera of Mydidae (Diptera), with the Description of three new Genera and two new Species

Bullae: 44, Apiophora paulseni Philippi; 45, Dolicliottaster brevicornis (Wiedemannj; 46, Eumydas corwpas, gen. n., sp, n.: 47, Messiasia pertenuis (Johnson); 48, Midacritus stuardoanue Seguy: 49, Mitrodetus dentitarsis (Macquart); 50, Opomudas atiuimus Seguy; 51, Mydas lividus Curran; 52, Nemomydas venosus (Loew); 53, Parctmydas igniticornis (Bigot); 54, Phyllomydas scitulus (Wiltiston): 55, Pluomudas peruviensis, gen. n., sp. n.; 56, Pseudo nomoneura hirta (Coquillett): 57, Pseudorliopalui mirandai (d'Andretta & Carrera).

Fig. 43 in The American Genera of Mydidae (Diptera), with the Description of three new Genera and two new Species

Fig. 43, Thorax of a Mydidae; ant: anterior mesonotum (prescutum); coi-L: coxa 1; ex-2: coxa 2; ex-3: coxa 3; eps-L: episternum 1; h.: halter; hum: humerus; hypo: laterotergite ("hypopleuron"); kem.; katepimeron; m-1: epimeron 1; m-2: epimeron 2; meso: mesopleuron; rnpl: metapleura; mts: metasternum; post: posterior mesonotum (scutum); psl: postscutellum (mediotergite): ptero: pteropleuron; s: spiracle; s-t: sternite 1; 8-2: sternite 2; sel: scutellum; sterno: sternopleuron; t-1a: tergite 1 (anterior); t-1p: tergite 1 (posterior); t-z: tergite 2.

Antennae: 30, Opornydas limbat1ts (Williston); 31, Opomydas town sendi (Williston); 32, Paramydas igniticornis (Bigot); 33, Plyornydas peruoieneis, gen. n., sp. n.; 34, Plyllomydas scitulus (Williston); 35, Phyllomydas phyllocerus Bigot; 36, Ph.ullomiuia« bruesii Johnson; 37, Pliullomuda« currani Hardy; 38, Pseudonomoneura californica. (Hardy); 39, Pseudonomoneura tinkhami (Hardy); 40, Pseudonomoneura micheneri (James); 41, Pseudonomoneura hirta (Coquillett): 42, Nemomudas lamia (Seguy). in The American Genera of Mydidae (Diptera), with the Description of three new Genera and two new Species

Antennae: 30, Opornydas limbat1ts (Williston); 31, Opomydas town sendi (Williston); 32, Paramydas igniticornis (Bigot); 33, Plyornydas peruoieneis, gen. n., sp. n.; 34, Plyllomydas scitulus (Williston); 35, Phyllomydas phyllocerus Bigot; 36, Ph.ullomiuia« bruesii Johnson; 37, Pliullomuda« currani Hardy; 38, Pseudonomoneura californica. (Hardy); 39, Pseudonomoneura tinkhami (Hardy); 40, Pseudonomoneura micheneri (James); 41, Pseudonomoneura hirta (Coquillett): 42, Nemomudas lamia (Seguy).

Antennae: 13, Apiophora paulseni Philippi; 14, Dolichogaster brevicornis (Wiedemann); 15, Eumyaas ecru/pas, gen. n., sp. n.; 16, Heteromutias bicolor Hardy; 17, Messiasia decor (Osten Sacken); 18, Messuieu: polita (Wiedemann); 19, Messiasia pertenuis (Johnson); 20, Midacritus stuardoanus Seguy: 21, Mitrodetus dentitarsis (Macquar't): 22, Mydas clavatus (Drury); 23, Mydas xanthopterus Loew; 24, Mydas luteipennis, Loew; 25, Mydas dives Westwood; 26, Mydas rubidapex Wiedemann; 27, Nemomudas pantherinus (Cerstaecker): 28, Nemomudas melanopooon. SteYskal; 29, Opornydas athamus (Seguy): in The American Genera of Mydidae (Diptera), with the Description of three new Genera and two new Species

Antennae: 13, Apiophora paulseni Philippi; 14, Dolichogaster brevicornis (Wiedemann); 15, Eumyaas ecru/pas, gen. n., sp. n.; 16, Heteromutias bicolor Hardy; 17, Messiasia decor (Osten Sacken); 18, Messuieu: polita (Wiedemann); 19, Messiasia pertenuis (Johnson); 20, Midacritus stuardoanus Seguy: 21, Mitrodetus dentitarsis (Macquar't): 22, Mydas clavatus (Drury); 23, Mydas xanthopterus Loew; 24, Mydas luteipennis, Loew; 25, Mydas dives Westwood; 26, Mydas rubidapex Wiedemann; 27, Nemomudas pantherinus (Cerstaecker): 28, Nemomudas melanopooon. SteYskal; 29, Opornydas athamus (Seguy):

PLATE XX. Fig. 1 in New genera and species from the Belly River Series (mid-Cretaceous)

PLATE XX. Fig. 1. Monoclonius belli, Lambe, parietal element of posterior crest, superior view; one-third the natural size. Page 66. Fig. 2. The same, inferior view. Fig. 3. Monoclonius dawsoni, Lambe, rostrai bone, side view; one-half the natural size. (Provisionaily associated with M. dawsoni). Page 63. Fig. 4. Outline of section of at ". " same c Fig. 5. Horn core with an asymmetrical base. Kot specifically determined. Fig. G. Sectional outlines of same at a and h" g, groove for premaxilla

PLATE XVIII. Fig. l in New genera and species from the Belly River Series (mid-Cretaceous)

PLATE XVIII. Fig. l. Monoclonius canadensis, Lambe, right mandibular ramus, external view; one-half the natural size. Page 65. Fig. 2. The same, internal view. Fig. 3. Monoclonius canadensis, maxillary tooth, external view; natural size. (Provisionally associated with M. canadensis.) Page 66. Fig. 4. Internal view of the same. Fig. 5. Tooth from lower jaw, (provisionally associated with M. canadensis), internal view natural size.; Fig. 6. The same, lateral view showing the two roots. Fig. 7. The same, external view. e, coronoid process; a, alveolar groove; b. syınphyseal surface; e, mandibular groove; f, facet for predentary bone.

PLATE XIX. Fig. 1 in New genera and species from the Belly River Series (mid-Cretaceous)

PLATE XIX. Fig. 1. Myledaphus bipartitus, Cope, pavement tooth, face of crown; enlarged four times. Page 28. Fig. 2. Side view of same tooth. g, crown; f, face of crown; r, root. Fig. 3. Lepidotus occidentalis, Leidy, outer surface of scale natural size. Page 29. Fig, 4. Monoclonius dawsoni, Lambe, lcft scapula and coracoid, internal view. (Provisionally associated with M. dawsoni); onefourth natural size. Page 60 Fig. 5. Monoclonius dawsoni, predentary bone, lateral view. (Provisionally associated with M. dawsoni); natural size. Page 63. Fig. 6. The same, viewed from above. s scapula; c coracoid; a, suture between scapula and coracoid; g, glenoid cavity; b, upper,, border d, anterior end; e, groove for dentary.

PLATE XVII. Fig. 1 in New genera and species from the Belly River Series (mid-Cretaceous)

PLATE XVII. Fig. 1.? Monoclonius dwasoni, Lambe, side view of'! nasal horn core; one-half the natural size. outlines of the at " " and " b " Fig. 2. Sectional same a 3. Monoclonius canadensis, Lambe, right Orbital horn core, obliquely from behind; one-halfe Fig. natural size. Page 63. o, orbit. sectional outline at " ". Fig. 4. The same, a 5. Palaeoscincus Lambe, side view of tooth; four times natural size. Page 54. Fig. asper,

PLATE XVI. Fig. 1 in New genera and species from the Belly River Series (mid-Cretaceous)

PLATE XVI. Fig. 1. Sacrurn, provisionally associated with Monoclonius dawsoni, Laınbe, superior view; two-sevenths the natural size. Page 61. Fig. 2. The same, viewed from the right.

PLATE XI in New genera and species from the Belly River Series (mid-Cretaceous)

PLATE XI. Stereocephalus tutus, Lambe, head armature, superior view natural size. The anterior end of specimen points downward. Page 55. a, anterior end.

PLATE XII. Fig. 1 in New genera and species from the Belly River Series (mid-Cretaceous)

PLATE XII. Fig. 1..Stereocephalus tutus, Lambe, view of left side of specimen figured on plate XI one half the natural size Page 55. Fig. 2. Palatal view of the same one-half tho natural size. Fig. 3. Stereocephalus tutus, coössified postcranial scutes, superior view two sevenths the natural size. Page 56. Fig. 4. The same, anterior view. Fig. 5. Transverse section of rib (provisionally associated with S. tutus; one-half the natural size.) Page 55. p, palatine; s, suture pt, pterygoid; z', inlerpterygoid vacuity pb, prosphenoid and basisphenoid element; a, anterior b, posterior.

DT A 'rw YTTT Unix... Au .. Ornithomimus nazis, Lainbe, phalanges of right pes, external view; natural size. Page 50. in New genera and species from the Belly River Series (mid-Cretaceous)

DT A 'rw YTTT Unix... Au .. Ornithomimus nazis, Lainbe, phalanges of right pes, external view; natural size. Page 50.

PLATE XIV Ornithomius altus, Lambe. Fig. l. Posterior dorsal vertebra, viewed from the left, natural size. Page 50 Fig. 2. Caudal vertebral., superior view, natural size. Page 52. Fig. The same, inferior view. Fig. 4. The same, left lateral view. Fig. The saule, posterior view. Fig. G. Distal end of iuetzttarszil III. of left pes, viewed from the front; natural size. Page 50. Fig. 7. The same, posterior view. Fig. ö. Terminal phalanx of pes, side view, natural size. Page 50. Fig. Ü. The same, posterior view. Fig. lo. 'Terminal phalanx of manus, side view; natural size. Page Õf. Fig. ll. The same, posterior view. Fig. 12. - Interior tooth, provisionally associated with O. altus, side view, natural size. Page 53. Fig. 13. Posterior view of the saure, showing the minute deııticulııtioııs on one of the two posterior gariugu, neural spine s, pim-zygapopliysis É, postzygapophysis, n, neural arch, J, diapophysis, _/, facet for chevron hone L', neural canal, c, posterior articular' face of ccntruin. in New genera and species from the Belly River Series (mid-Cretaceous)

PLATE XIV Ornithomius altus, Lambe. Fig. l. Posterior dorsal vertebra, viewed from the left, natural size. Page 50 Fig. 2. Caudal vertebral., superior view, natural size. Page 52. Fig. The same, inferior view. Fig. 4. The same, left lateral view. Fig. The saule, posterior view. Fig. G. Distal end of iuetzttarszil III. of left pes, viewed from the front; natural size. Page 50. Fig. 7. The same, posterior view. Fig. ö. Terminal phalanx of pes, side view, natural size. Page 50. Fig. Ü. The same, posterior view. Fig. lo. 'Terminal phalanx of manus, side view; natural size. Page Õf. Fig. ll. The same, posterior view. Fig. 12. - Interior tooth, provisionally associated with O. altus, side view, natural size. Page 53. Fig. 13. Posterior view of the saure, showing the minute deııticulııtioııs on one of the two posterior gariugu, neural spine s, pim-zygapopliysis É, postzygapophysis, n, neural arch, J, diapophysis, _/, facet for chevron hone L', neural canal, c, posterior articular' face of ccntruin.

PLATE XXI. Fig. 1 in New genera and species from the Belly River Series (mid-Cretaceous)

PLATE XXI. Fig. 1. Stegoceras validus, Lambe, prenasal bone; side view. Natural size. Page 63. Fig. 2. The same, inferior aspect. Fig. 3. Superior view of another specimen; natural size. Fig. 4. The same; side view. Fig. 5. The same; inferior view. Fig. 6. Stereocephalus tutus, Lambe, symmetrical plate, superior aspect; one-half the natural size. (Pro. visionally associated with S. tutus). Figs. 7 and S. Similar keeled plates one-half the natural size. Fig. 9. Shield of Acipenser albertensis, Lambe, viewed from above. Natural size. Page 29

PLATE IX. Fig. 1 in New genera and species from the Belly River Series (mid-Cretaceous)

PLATE IX. Fig. 1. Trachodon (Pteropelyx) marginatus, Lambe, right tibia, external view; fi-ve twenty-thirds the natural size. (Provisionaliy associated with T marginatus). Page 73. Fig. 2. Another tibia of the same species, posterior view; similarly reduced. (Provisionally associated with T. marginatus)

PLATE VII. Fig. 1 in New genera and species from the Belly River Series (mid-Cretaceous)

PLATE VII. Fig. 1. Trachodon (Pteropelyx) marginatus, Lambe, left ulna and radius, anterior view; one-third natural size. From the S 8.l119 lll(ll \'l(ll 1{1l as that to which the humerus, figured on plate VI, belonged. Page 72. Fig. 2. The same, posterior view. 11, ulna r, radius; o, olecranon process.

PLATE VIII. Fig. l in New genera and species from the Belly River Series (mid-Cretaceous)

PLATE VIII. Fig. l. Trachodon (Pteropelyx) marginatus, Lambe, right femur, anterior view; one-fifth the natural size. (Provisionally associated with T. marginatus). Page ÎÎZ. Fig. 2. The same, internal view. Fig. 3. The same, posterior view. h, head; l, great trochanter; m, third trochanter; e, inner condyle.

PLATE VI. Fig. 1 in New genera and species from the Belly River Series (mid-Cretaceous)

PLATE VI. Fig. 1. Trachodon (Pteropelyx) marginatus, Lambe, left humerus, viewed obliquely from inner front,' one-third natural size. Page Tl. Fig. 2. The same, from outer rear. Fig. 3. Trachodon (Pteropelyx) marginatus, impression of epidermis, from the sandstone in which the above specimen was embedded; natural size. r, radial crest; lı, head; i, inner tuberosity; 0, outer tuberosity; c, outer condyle.

PLATE V Fig. 1 in New genera and species from the Belly River Series (mid-Cretaceous)

PLATE V Fig. 1. Trachodon (Pteropelyx) marginatus Lainbe. right inaxillarv bone. external view: reduced one- 1¬¬ 1. ¢_ um» 7.1-.. -..De Fig. 2. The same, internal view. Fig. 3. The same, superior view. a, facet for jugal; b, facet for palatine.

PLATE I. Fig. 1 in New genera and species from the Belly River Series (mid-Cretaceous)

PLATE I. Fig. 1. Trionyx foveatus, Leidy, upper surface of the carapace shown in figure l, p. 34, * one-half the " nhn-n] cian puma 22 JÃIUUUICUI Dllıbı J. luau LII-Ia Fig. 2. Trionyx ƒoveatus, lower or outer surface of a right hypoplastral bone; natural size. Page 35, Fig. 3. Trionyx vagans, Cope, upper surface of carapace shown on page 37, figure 3,' slightly less than one-fourth natural size. Page 36. Fig. 4. Portion of the upper surface of thc same carapace, natural size; to show the sculpture.