NO. 3665 CADDISFLIES—FLINT OF 
Key to Species 
ADULTS 
Clasper of male in lateral aspect very narrow, developed into an apicodorsal 
point; eighth tergum of female slightly less produced than sternum, trilobate. 
H. grenadensis 
Clasper broader, widening regularly from base to apex; eighth tergum deeply 
ange rectangularly “emarpinate. 2) ss, soi jelis Oe eh els H. antilliarum 
153 157 
Ficures 150-158.—Hydroptila antilliarum, new species: 150, male genitalia, ventral; 151, 
male genitalia, lateral; 152, aedeagus, lateral; 153, female eighth sternum, ventral; 154, 
bursa copulatrix, ventral. H. grenadensis, new species: 155, male genitalia, ventral; 
156, male genitalia, lateral; 157, aedeagus, lateral; 158, female eighth sternum, ventral. 
Hydroptila antilliarum, new species 
Fiaures 150-154 
This species is related to a species from Mexico that I believe to 
be H. paschia Mosely. From this species it differs in the more deeply 
divided tenth tergum, longer claspers, and smaller membranous 
process of the aedeagus. 
Apu.t.—Length of forewing 2 mm. Color brown, mottled with 
patches of white hair. Male genitalia: ninth segment with anterior 
margin slightly expanded ventrally, posterior margin developed into 
a sharp point laterad of clasper; tenth tergum with declivent, sclerot- 
ized, lateral band, divided dorsally almost to base; clasper evenly 
