NO. 3665 CADDISFLIES—FLINT 65 
beyond which extends a thinner, more membranous collar that bears 
mesally a dark point to which are attached long, internal rods; bursa 
copulatrix with a short basal stem, a broad rounded apical lobe, and a 
complex of central structures; ninth and tenth segments extremely 
long and extensile. 
MatTERIAL.—Dominica, Freshwater Lake, 14 April 1964, O. S. Flint, Jr., 19 ; 
Pont Casse, .4 miles east, 16 May 1964, O. 8S. Flint, Jr., 19. 
Ochrotrichia (M.) species 2 
Figures 184-185 
On the basis of size and coloration, these are possibly the females 
of O. exclamationis. The structure of the eighth sternum is extremely 
distinctive. 
Aputt.—Length of forewing 1.5-2 mm. Color silver gray, forewing 
with several transverse bands of white hair, antenna pale basally, 
dark apically. Female genitalia: eighth sternum with posterior margin 
slightly lobate mesally; with an internal posteromesal sclerite giving 
rise to internal rods from its lateral angles and with its posterior mar- 
gin developed into a projecting mesal lobe; eighth segment dorsally 
with a pair of knobbed submesal processes; bursa copulatrix ovoid, 
with lateral margin bandlike and a central complex. 
MarteErtaL.—Dominica, Pont Casse, 2.5 miles east, 16 Jan. 1965, W. W. Wirth, 
39. 
Family LEPTOCERIDAE 
The leptocerids are worldwide in distribution but perhaps a little 
more abundant and diverse in the warmer regions than in the colder. 
This is probably because they are one of the few families that have 
successfully invaded the larger, warmer lakes and slowly flowing rivers. 
The larvae construct cases that are generally tubular and made of 
sand or organic matter although a few genera hollow-out twigs or 
utilize discarded cases of other species. Pupation takes place within 
the larval case, which has been firmly attached to some object in the 
substrate. 
Key to Genera 
LARVAE 
1. Metanotum with large sclerotized plates ......4.4... Atanatolica 
MGtANOLUM. WHOMY MGMpPranOUs, 2) ccc. cs tee olpice sh os) fe. ous wesipy woh es 2 
2. Anal proleg ventrally with linear rows of hairs and spines . Brachysetodes 
Anal prolegs without hairs and spines ventrally ......... Oecetis 
ADULTS 
1. Forewing with M unbranched from base to apex ........ Oecetis 
Forewing with M branched near wing margin. ........4-.2... 2 
313-152—68——_5 
