Zelusia principalis Lugo-Ortiz & McCafferty 1998

(Figs. 67–75)

Taxonomy. This species, described based on nymphs, can be distinguished by the following combination of characters: 1) labrum medially raised, dorsally with a row of long robust subapical setae on either side of midline (Figs. 67 a and b); 2) mandibles with incisors fused (Figs. 68–69); 3) left mandible with prostheca robust (Fig. 68); 4) right mandible with prostheca bifid (Fig. 69); 5) lingua rounded with tuft of setae apically (Fig. 70); 6) maxillae with palpi two-segmented and longer than galea-lacinia (Fig. 71); 7) glossae subequal in length to paraglossae, the last one subquadrate and with 2 rows of spine-like setae, segment II of palpi without lateral projection (Fig. 72); 8) legs elongate, dorsal edge of femora with a row of spine-like setae (Fig. 73); 9) tarsal claws with a row of denticles (Fig. 74); 10) hind wing pads absent; 11) terga dorsal surface with scales, posterior margin with pointed projections (Fig. 75).

Distribution. Brazil, Colombia and Venezuela

Material examined. One nymph: Tarotá river, 5º 49´N, 61º 25´W, 1324 m, 18/ 03/ 2006, EG, AMO, and MEG cols. One nymph: stream close to Paují locality, 4º 36´N, 61º 5´W, 942 m, 17/ 3/ 2006, EG, AMO, and MEG cols. One nymph: Kako-Parú stream, 4º 54´N, 61º 5´W, 913 m, 25/ 11/ 2005, EG, AMO, CA and MEG cols. Two nymphs: river close to Paují locality, 4º 29´N, 61º 34´W, 917 m, 17/ 3/ 2006, EG, AMO, and MEG cols. One nymph: Parupa river, 5º 40´N, 61º W, 1281 m, 28/ 6/ 2007, EG, AMO, CA and MEG cols. One nymph: Kauí stream, 5º 28´N, 61º16´W, 1196, 24 / 11/ 2005, EG, AMO, CA and MEG cols. Material housed at IML.