460 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



Larva. — Length 23 mm,, width 3 mm. Head yellowish, with brown 

 area middorsally and extending anteriorly along frontal sutures and 

 with conspicuous pale muscle scars; slightly darker laterally with indis- 

 tinct pale muscle scars (fig. 3, a). Setae arranged as in figure 3, a, most 

 greatly reduced in length. Labrum dorsally with seta 5 erect and 

 pigmented, remainder decumbent and colorless, lateral brush weak; 

 ventrally %vith an apicomesal patch of posteriorly directed spicules and 

 a pair of ovoid sclerites submesally (fig. 3,c). Mandibles with dorsal 

 cutting edge completely overhanging ventral, each mandible with 2 

 dorsal subapical teeth; ventral edge poorly developed, with 1 small 

 subapical tooth (fig. 3,d). Maxilla as seen from ventral surface with 

 typical cardo; stipes angulate near middle, appearing jointed here; 

 palpifer typical; first and second palpal segments short, third and 

 fourth each about twice as long as second; galea cylindrical (fig. 3,6). 

 Labium in ventral view with the submentum apparently fused to 

 praegula, whole elongate and bifurcate anteriorly; palpal segment 

 about twice as long as broad (fig. 3,6). In dorsal view the membrane 

 basal to galea, with 2 large flattened setae and numerous hairs; labium 

 with a large apicolateral lobe bearing many normal and flattened setae; 

 men turn with a row of strong teeth along posterior margin; hypo- 

 pharyngeal rods bearing a row of strong teeth on their apicomesal 

 margins (fig. 3,6). 



Pronotum yellowish brown, darker laterally, with dark muscle scars 

 and black posterior margin (fig. 3, a). Mesonotum and metanotum 

 membranous, each with 3 pairs of setae. Prosternum with a large mesal 

 sclerite bearing a pair of small anterolateral sclerites (fig. 3,e), area 

 between legs almost completely filled by these sclerites. Femur of 

 foreleg -with apicoventral angle produced into a thumblike process 

 against which reduced til)ia, tarsus, and claw closes (fig. 3,/); femur 

 twisted at 90° to axis of coxa so that normal posterior face is dorsal. 

 Midleg and hindleg normally developed and nearly identical, except 

 hind tibia and tarsus slightly longer. 



Abdominal segments 2-9 with 1 pair of long setae ventrally; seg- 

 ments 1-9 with a long setae laterally (much shorter on 1 and 9); seg- 

 ments 1-8 with a pair of setae posterodorsally, and more anteriorly 

 another pair which are minute except on 7 and 8. Ninth tergite brown, 

 straplike, with 3 pairs of long and 1 pair of short setae posteriorly (fig. 

 3,^). Anal proleg yellowish brown marked with black, bearing a stout 

 basoventral spine; claw lacking ventral teeth (fig. 3,h). 



Material. — Ecuador: stream about 5 miles south of Antisana, 

 13,500 ft., Apr. 28, 1958, R. W. Hodges, 2 larvae. 



