No. 3665 CADDISFLIES—FLINT 76 
the West Indian islands support one to three or four species, most 
of which appear to be endemic to one or adjacent islands. 
The larvae and pupae inhabit cases made of sand grains in the 
form of a snail shell. The immatures have been described in detail 
a number of times (Betten 1934, Botosaneanu 1959). 
Key to Species 
LARVAE AND CASES 
Sclerites pale yellowish, hind femur with more than 35 setae; case with umbilicus 
TOTEAEING . CY BCIH ts Agatti te Mea te ati mM ae RL ee ae Ba H. apicauda 
Sclerites brown, hind femur with about 15 setae; umbilicus almost completely 
CLOSCOSEMIEM RRL os pte che Medea chy P Lg Warm grat ang) cd vat bay ahaa H. species 2 
FEMALES 
Anterolateral angles of subgenital plate with cuplike invaginations. H. apicauda 
Subgenital plate without anterolateral invaginations. ..... H. species 1 
Helicopsyche apicauda, new species 
Figures 226-229 
This species is another member of the Helicopsyche haitiensis group, 
and perhaps closest to H. incisa Ross. From this it differs in having 
the mesobasal lobe of the claspers directed more dorsad and in having 
the anterodorsal angle more rounded and the apicodorsal point 
narrower in the claspers. 
Aputt.—Length of forewing 4-5.5 mm. Color pale brown. Basal 
abdominal segments reticulate ventrally; sixth sternum with a terete 
process expanded apically, about as long as sternum. Male genitalia: 
ninth segment rather wide ventrally; tenth tergum short, slightly 
arched, apex shallowly bilobate; clasper rounded anterodorsally, 
apical point elongate, posterior margin almost straight, mesobasal 
lobe elongate, directed slightly dorsad, and distinctly separated from 
clasper; aedeagus short and broad, especially apically. Female geni- 
talia: subgenital plate conical, extending almost as far posteriad as 
cerci, lateral margin sclerotized with anterolateral angles bearing 
a cuplike pocket; cercus short, ventral plate rounded apically; bursa 
copulatrix with long slender posterior supports, internally with 2 
flattened plates. 
Larva.—Length (straightened) about 6 mm. Seclerites pale 
yellowish. Head with many small spicules frontally; a slight ridge 
from eyes to posterior of frontoclypeal suture, ridge well separated 
from suture, which is indented to a point at midiength. Pronotum 
with anterior margin and anterior third bearing many pale, bladelike 
setae. Rather hairy in general; posterior femur bearing about 36 
setae. 
Pupa.—Length about 5 mm. Mandibles sickle shaped without 
inner teeth. Hook-plates anteriorly on segments 3-6, posteriorly on 
