NO. 8665 CADDISFLIES—FLINT 67 
2. Hindwing with anal area expanded, wing broader than forewing. 
Atanatolica 
Hindwing with anal area compressed, wing narrower than forewing. 
Brachysetodes 
Genus Oecetis McLachlan 
Oecetis McLachlan, 1877, p. 329. [Type-species: Leptocerus ochraceus Curtis, 
1825, by subsequent designation of Ross, 1944.] 
A single species of this worldwide genus has been found on Dominica. 
The larvae of this genus generally make rather bulky cases of plant 
material although some make more trim cases of sand grains. The 
long mandibles and palpi of the larvae are apparently correlated with 
a trend toward predation. 
Oecetis pratti Denning 
Figures 186-188, 196-201 
Oecetis pratti Denning, 1947, p. 656.— Wolcott, 1950, p. 93.—Flint, 1964b, p. 62.— 
Fischer, 1966, p. 140. 
The species has heretofore been known only from Puerto Rico 
although there are closely related, if not identical, species in Florida 
and Peru. The Dominican specimens differ slightly from the Puerto 
Rican in possessing a more elongate tenth tergum. 
Apuit.—Length of forewing 7-8 mm. Color brown, forewing with 
small tufts of black hair where Rs branches and just ventrad on M, 
where Re+3 and Cu, branch, and where the branches of Cu meet the 
wing margin. Male genitalia: ninth segment narrow, slightly widened 
laterally; cercus ovate about twice as long as broad; tenth tergum 
rodlike, longer than cerci, slightly expanded apically; a conical pro- 
cess slightly ventrad of tenth tergum; clasper broad basally, tapering 
to a blunt apex, inner margin near apex bearing short, stout, recurved 
setae, basomesal lobe with short setae; aedeagus tubular, slightly 
enlarged apically, internally with a pair of angular sclerites. Female 
genitalia: eighth sternum without strongly sclerotized marks; bursa 
copulatrix elongate; seventh segment internally with a hollow, more- 
or-less spherical structure. 
Larva.—Length to 5 mm. Head mottled yellow and brown; thoracic 
notae more uniformly brown. Foreleg short and broad, mid- and 
hind-legs slender, hindleg especially long, with tibia and tarsus divided 
at midlengths. Spacing humps well developed; gills single; lateral 
line lacking. Ninth tergum with 3 pairs of long, black setae. Anal claw 
with 3 small accessory teeth in a transverse row. 
Pupa.—Unknown. 
