FIGURES 20–33 in Two new species of Caenis Stephens, 1835 (Ephemeroptera: Caenidae) from South America

FIGURES 20–33. Nymph of Caenis elidioi sp. nov. 20) labrum; 21) left mandible (ventral view); 22) right mandible (dorsal view); 23) hypopharynx; 24) maxilla; 25) coxal projection of hind coxa; 26) foreleg; 27) middle leg; 28) hind leg; 29) comblike setae of middle leg; 30) details of setae of hind margin of middle femur; 31) fore tarsal claw; 32) middle tarsal claw; 33) hind tarsal claw.