Spiritiops silvudus Lugo-Ortiz & McCafferty 1998

(Figs. 7, 57–66)

Taxonomy. This species can be distinguished by the following combination of characters, in the nymph: 1) labrum dorsally with two pairs of long subapical setae (Fig. 57 a), anterior margin with bifid bipectinate setae (Fig. 57 b); 2) mandibles (Figs. 58–59) with incisors fused and with prostheca robust; 3) right mandible with setae between prostheca and mola, and prostheca with transverse bipectinate seta (Fig. 59); 4) hypopharynx with lingua subequal in length to superlinguae (Fig. 60); 5) maxillae with palpi two-segmented, segment II with a constriction (Fig. 61); 6) labium with glossae subequal to paraglossae, glossae with a row and paraglossae with 3 rows of spine-like setae, segment II of palpi with slight distomedial projection, segment III small and conical (Fig. 62); 7) legs robust, dorsal edge of femora with a row of spine-like setae (Fig. 63); 8) tarsal claws with two rows of denticles and with a strong subapical seta (Fig. 64); 7) hind wing pads present; 8) terminal filament 0.8 times the length of cerci; 9) abdominal color pattern as in Fig. 7; 10) posterior margin of abdominal terga with rounded projections (Fig. 65); 11) posterior margin of paraprocts with spines (Fig. 66).

Distribution. Brazil, Colombia, French Guiana, Surinam and Venezuela.

Material examined. One nymph: Aponwao river, 5º 51´N, 61º 27´W, 1340 m, 27/ 6/ 2007, EG, AMO, CA and MEG cols.; 6 nymphs same locality and collectors, 18/ 3/ 2006. 12 nymphs: Tarotá river, 5º 49´N, 61º 25´W, 1324 m, 18/ 03/ 2006, EG, AMO, and MEG cols; 10 nymphs same locality and collectors, 28/ 6/ 2007. Two nymphs: Golondrina river, 5º 32´N, 61º16´W, 1143 m, 23/ 11/ 2005, EG, AMO, CA and MEG cols. 10 nymphs: Maremán-Parú, 5º 44´N, 61º 24´W, 1308 m, 23/ 11/ 2005, EG, AMO, CA and MEG cols.; 6 nymphs same locality and collectors, 19/ 3/ 2006; 8 nymphs same locality and collectors, 27/ 6/ 2007. Two nymphs: Kaimorán river, 5º 37´N; 61º 21´W, 1313 m, 23/ 11/ 2005, EG, AMO, CA and MEG cols.; 13 nymphs same locality and collectors, 20/ 3/ 2006; 3 nymphs, same locality and collectors, 29/ 6/ 2007. Two nymphs: Kauí stream, 5º 28´N, 61º16´W, 1196 m, 24/ 11/ 2005, EG, AMO, CA and MEG cols.; one nymph, same locality and collectors, 20/ 3/ 2006. Two nymphs: Kako-Parú stream, 4º 54´N, 61º 5´W, 913 m, 25/ 11/ 2005, EG, AMO, CA and MEG cols. Two nymphs: stream close to Kavanayén locality, 5º 38´N, 61º 40´W, 1355 m, 22/ 11/ 2005, EG, AMO, CA and MEG cols.; 5 nymphs same locality and collectors, 19/ 3/ 2006. 15 nymphs: Kavanayén stream, 5º 37´N; 61º 44´W, 1355 m, 21/ 11/ 2005, EG, AMO, CA and MEG cols. Eight nymphs: Pacheco river, 5º 10´N, 61º 29´W, 1144 m, 24/ 11/ 2005, EG, AMO, CA and MEG cols.; 2 nymphs, same locality and collectors, 21/ 3/ 2006. Seven nymphs: river close to Paují locality, 4º 29´N, 61º 34´W, 917 m, 17/ 3/ 2006, EG, AMO and MEG cols. Two nymphs: Parupa river, 5º 40´N, 61º 32´W, 1281 m, 29/ 6/ 2007, EG, AMO, CA and MEG cols. Seven nymphs: stream close to Paují locality, 4º 36´N, 61º 5´W, 942 m, 17/ 3/ 2006, EG, AMO, and MEG cols. Material housed at IML except 10 nymphs housed at MLBV.