setae 14 and 12 are situated posterior to the periocular area; seta 16 

 situated posterior to them; seta 15 small and light; seta 17 short and slightly 

 thinner than the others, situated slightly asymmetrically posterior to the 

 bifurcation of the frontal sutures. Ventral seta 8 situated near the anterior 

 margin, thin, brown, resembling seta 7; seta 18 dark brown, spinelike, 

 situated in the posterior half of the head, widely separated (Figures 524, 525). 



[381) 



FIGURES 524-526. Stenopsyche griseipennis McL.: 

 524 — head, dorsal; 525 — head, ventral; 526 - pronotum. 



Labrum (Figure 527) with yellowish hairs near the anterior membranous 

 margin; dorsal sclerite yellowish brown, dark brown in the middle and near 

 the posterior angles; seta 1 not visible among the hairs; seta 3 short, light, 

 situated near the anterior margin; seta 5 larger, situated near the margin; 

 seta 6 also brown, large; setae 2 and 4 small, light, situated close together 

 lateral to the median indentation. 



Mandibles (Figure 528) with broad, yellowish, concave outer side; upper 

 blade little marked. Left mandible with a large distal tooth on the upper 

 blade; lower blade of left mandible with 3 teeth in addition to the apical 

 tooth; middle tooth of this group small; in addition to the two large teeth 

 of the upper and lower blade, apical part of left mandible with one or two 

 381 additional teeth, one of them very small; a brush of dense, shining golden 

 chetoids in the median depression. Upper blade of right mandible with 

 2 teeth, a large apical tooth and a small little marked tooth near it; lower 

 blade with 3 teeth in addition to the apical tooth; middle tooth of this group 

 very small. Outer setae of mandibles situated in a dorsal groove, they are 

 almost of the same length, situated at a distance from the base and from 

 each other; basal seta brown and almost straight; apical seta curved and 

 lighter. 



426 



