458 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii4 



Atopsyche alconura Ross (?) 



Figure 2,a-(i 



Of this species, I have several larvae and a single pupa in which the 

 male genitalia are developed enough to be suggestive of alconura, 

 but not enough to be certain. The other larvae are associated with 

 this specimen by means of the included larval sclerites in the meta- 

 morphotype. 



The larva agrees in structm'al characteristics with the detailed 

 description given that of Atopsyche species 1. 



Larva. — Length 7 mm., width 1 mm. Head (fig. 2, a) yellowish, 

 with a dark brown area dorsomesally extending anteriorly on the 

 frontoclypeus (lacking on 1 larva) and a narrow band extending 

 ai'ound the sides to meet and greatly enlarge midventrally; dark 

 areas Vvdth conspicuous pale muscle scars. Pronotum yellowish, 

 with brown on posterior half, black on posterior margin, and antero- 

 lateral angle (fig. 2, a). Anal proleg lacking basoventrai spine in 1 

 specimen. 



Pupa.— Length 6 mm. ; specimen considerably deformed. Mandibles 

 long, slender, and toothed and serrate over entu'e inner margin 

 (fig. 2,c). Labrum roughly semicircular with 7 pairs of setae (fig. 

 2,d). Head capsule with 3 pau's of setae below antennae, 1 above 

 base of each mandible, 1 pak between antennal bases, 4 pairs posterior 

 to antennae and 3 on rear of each eye. Pronotum and metanotum each 

 with 2 pairs of setae, mesonotum with 3 pairs. Foreleg with 1 seta 

 near apex of coxa, 2 near apex of femur. Midleg with 1 seta near base 

 and 2 near apex of coxa, 2 setae near apex of femur, and 2 contiguous 

 near apex of tibia; hair fringe v/ell developed on both sides of tarsal 

 segments. Hindleg with 1 small seta on coxa. Abdominal segments 

 1-8 with a pair of setae dorsally, another laterally, and 4-5 ventrally 

 (possibly lacking on 1-4). Hook plates anteriorl}^ on segments 2-7, 

 posteriorly on 4 and 5; actual number of hooks per plate obscure. 

 Apex of abdomen with lobes containing genitalia; dorsal lobes each 

 with 3 stout setae posterolaterally (fig. 2,6). 



Material. — Ecuador: Rio San Daly, 3.3 miles east of Puyo, 2500 

 ft., Apr. 16, 1958, R. W. Hodges, 1 pupa. Rio Saloya, north of 

 Chu-iboga, 6500 ft.. Mar. 31, 1958, R. W. Hodges, 1 larva.; 

 Rio Rebadiniera, 10 miles north of Puyo, 3000 ft., Apr. 18, 1958, 

 R. W. Hodges, 1 larva. 



Atopsyche species 1 



Figure 3 



The larva of this species was chosen for detailed description only 

 because it is relatively large and the structures ai'e more distinct. 



