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Figs. 1–4 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Figs. 1–4. Distribution of primary setae and pores on the maxilla of selected groups of Dytiscidae. 1–2) maxilla of Laccophilus hyalinus (Laccophilinae), dorsal and ventral aspects respectively, showing the distribution of primary setae and pores outside the Hydroporinae; 3–4) maxilla of a generalized Hydroporinae larva, dorsal and ventral aspects respectively, showing the ground plan pattern of primary setae and pores proposed in this study (compared with Alarie 1991). Numbers and lower case letters refer to primary setae and pores respectively.

Fig. 2 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 2. Maxilla of adult Nearctic Brychius spp. (Coleoptera: Haliplidae); left side, ventral view: a) B. hornii Crotch; b) B. hungerfordi Spangler; c) B. pacificus Carr.

Fig. 8 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 8. Gonocoxa of Nearctic Brychius spp. (Coleoptera: Haliplidae); a) B. hornii Crotch; b) B. hungerfordi Spangler; c) B. pacificus Carr.

Fig. 10 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 10. Right paramere of Nearctic Brychius spp. (Coleoptera: Haliplidae); a) B. hornii Crotch; b) B. hungerfordi Spangler; c) B. pacificus Carr.

Figs. 14–19 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Figs. 14–19. Polyclada species, the Omusati and Ohangwena regions, northern Namibia, January–February. 14) host plant, Sclerocarya birrea (Anarcardiaceae), marula

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Figs. 10–15. Hoperius planatus, first instar. 10 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Figs. 10–15. Hoperius planatus, first instar. 10) Metathoracic leg, anterior view; 11) Metathoracic leg, posterior view; 12) Metathoracic tarsus, dorsodistal aspect; 13) Abdominal segment 8, dorsal view; 14) Abdominal segment 8, ventral view; 15), Urogomphus, dorsal aspect. Abbreviations: CO = coxa; FE = femur; PT = pretarsus; TA = tarsus; TI = tibia; TR = trochanter. Solid squares refer to additional setae; solid triangles refer to additional pores. URb, URc, and additional sensilla on the urogomphus are not labeled.

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Figs. 2–9. Hoperius planatus, first instar. 2 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Figs. 2–9. Hoperius planatus, first instar. 2) Cranium, dorsal view; 3) Cranium, ventral view; 4) Right antenna, dorsum; 5) Left antenna, venter; 6) Antennomere 3, distal aspect; 7) Right mandible, dorsum; 8) Maxilla and labium, venter; 9) Prementum, dorsal view. Abbreviations: A3′ = ventrolateral apical process of antennomere 3; EB = egg burster; FR frontoclypeus; LA = labium; LM = labrum; MX = maxilla; PA = parietal; Sp = spinula; TP = posterior tentorial pit. Solid squares refer to additional setae; solid triangles refer to additional pores.

Fig. 24 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 24. Leg chaetotaxy of right metathoracic leg of the larva of Brychius hornii Crotch

Fig. 22 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 22. Leg chaetotaxy of right prothoracic leg of the larva of Brychius hornii Crotch

Fig. 20 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 20. Leg chaetotaxy of right mesothoracic leg of the larva of Brychius hornii Crotch

Fig. 21 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 21. Leg chaetotaxy of right metathoracic leg of the larva of Brychius hornii Crotch

Fig. 19 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 19. Leg chaetotaxy of right prothoracic leg of the larva of Brychius hornii Crotch

Figs. 1–4. 1 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Figs. 1–4. 1) San man digging up Diamphidia cocoons, N of Botlapatlou, 23°45910.90S,

Figs. 1–3. Eulechriops hovorei, new species. 1 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Figs. 1–3. Eulechriops hovorei, new species. 1) dorsal view; 2) lateral view; scale bar 5

Fig. 13 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 13. Mesothoracic leg of adult male Nearctic Brychius spp. (Coleoptera: Halipli-

Fig. 1 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 1. Lateral (A) and dorsal (B) views of Chlamydopsis chadster, new species; lateral

Fig. 1a in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 1a, Xylotrechus hovorei Swift, new species, male, dorsal habitus. Fig. 1b, X. nauticus

Figs. 3–4. Akrobothrus ecuadoriensis 3 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Figs. 3–4. Akrobothrus ecuadoriensis 3) female frons 4) male frons.

Fig. 18 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 18. Urogomphus of third instar larva of Brychius hornii Crotch

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Fig. 31 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 31. Distribution of Brychius hornii Crotch (Coleoptera: Haliplidae) and Brychius pacificus Carr (Coleoptera: Haliplidae) in Oregon, U.S.A. based on specimens examined.