NO. 3665 CADDISFLIES—FLINT 4] 
of this group, I prefer to leave both groups in the genus Alisotrichia, 
rather than establish a second genus. 
Key to Species 
LARVAE 
1. Abdominal terga with large, elongate-oval setae... .. . . A. species 2 
Abdominal terga with short, truncate setae... ........e84.8-. 2 
2. First abdominal tergum with a central dark mark ... .. . A. orophila 
First abdominal tergum without a central mark. ...... A. species 1 
ADULTS 
ieee Madleg: without a preapical spur . . 6. . 6. 6 6 0 ele os Be oes ee 
Madierawithy a-preapiCAl Spur sts vwlece oe) ce) a) es ees ay) eel aah 3 
2. Highth sternum of male with a bifurcate ventrolateral lobe; forewing gray, 
WAGHEWIMILENPALGHES 5 0s os, wt, tee lo oe gee ener A. orophila 
Highth sternum with a rounded dorsolateral lobe and a pointed ventrolateral 
ROHS MMete Ys ciat her) “al snes Cd cath Ace pie 2) a oar crdeiawo ye! Soko acne A. lobata 
3. Claspers fused into a single median rodlike process; forewings fuscus with 
brighitvereentspOtstitms 1 yioceco sense ne eitiey ate A. septempunctata 
Claspers not fused: without green.spots .. . . . . « « © « «ss 6 « 4 
4. With an elongate process extending ventrad from venter of tenth segment 
A. dominicensis 
Without an elongate midventral process from tenth sternum .. A. wirthi 
Alisotrichia orophila, new species 
Figures 92-94, 105 
The species seems to be closely related to the following from which 
it differs strikingly in the shape of the eighth sternum, which possesses 
a long dorsolateral spine and a bifurcate apicolateral hook. 
Avu.tt.—Length of forewing 1.5 mm. Color grayish, forewing with 
alternating bands of silver and fuscus hair. Structure of head and ap- 
pendages conforming closely to type species. Male genitalia: eighth 
sternum bearing a long dorsolateral spine, apicolateral angle with a 
strong mesally directed, shallowly bifurcate hook; ninth segment with 
extremely long anterolateral rods, with a dorsomesal sclerite; tenth 
tergum with paired dorsal, straplike sclerites, apex with a semimem- 
branous process; aedeagus tubular, with conical base. Female genitalia: 
seventh tergum narrowly triangular; eighth and ninth segments with 
long anterolateral rods; apparently the same as following species. 
Larva.—Length 1.5 mm. Sclerites pale brown. Structurally very 
similar to larva of type species, but differing in the possession of a ter- 
gite on first abdominal segment. 
Pupa.—Length 1.2 mm. Mandibles with a short apical blade, lack- 
ing mesal serrations. Hook-plates anteriorly on segments 3-7, pos- 
teriorly on 3-5; each with many hooks. 
