NO. 3665 CADDISFLIES—FLINT 55 
The species is related to O. janella but is easily recognized by the 
more deeply divided ninth sternum and the very different dorsal 
processes of the same segment. 
Apu.t.—Length of forewing 2 mm. Color various shades of brown 
and white. Male genitalia: eighth segment divided midventrally and 
dorsally, posterolateral margin bilobate; ninth sternum produced 
posteriorly, deeply divided apically, dorsally giving rise to a pair of 
curving rods laterad to the aedeagus, each with an apical spine, ventrad 
to aedeagus a mesal, pointed structure; aedeagus tubular, basally ex- 
panded. Female genitalia: eighth sternum with posterior margin slightly 
bilobate, with a pair of ovate depressions; bursa copulatrix with 
posteriolateral supports, with basal portion angulate, complex, with 
a large basal membranous sac. 
Larva, PupPA, cAsE.—Not known for certain. 
MareriAL.— Grenada, 2 miles west of Grand Etang, 4-8 Aug. 1963, O. S. Flint, 
Jr., 24o7 119. Balthazar, 7 Aug. 1963, O. S. Flint, Jr.,107 29. 
Brotocy.—A number of typical larvae and pupae of this genus were 
taken on rocks in the small brook two miles west of Grand Etang and 
may belong to either this or the preceding species. The stream is 
about three feet wide by six inches deep on the average, clear, and 
tumbling over bedrock and boulders. 
Oxyethira cirrifera Flint 
Figures 140-141, 144, 147 
Oxyethira cirrifera Flint, 1964b, p. 57; 1968a, p. 42. 
The species was described from Puerto Rico and has since been 
found on Jamaica, and now Dominica. It is related to the following 
species, from which it differs most noticeably in the structure of the 
eighth segment and aedeagus. 
Aputt.—Length of forewing 2 mm. Color pale brown with some 
darker flecks. Male genitalia: eighth tergum produced laterally into 
a long saber-like process, sternum produced dorsolaterally in a broad 
flap; clasper dark, tightly attached to ninth sternum, quadrate in 
ventral aspect; subgenital plate C-shaped in lateral aspect, in 
ventral aspect produced into 2 submesal points; an elongate, seta- 
bearing rod dorsal of clasper; aedeagus with a flattened process 
arising at midlength and twisted around central tube 1% times; 
central tube attenuate beyond origin of process, tip slightly twisted. 
Female genitalia: eighth sternum produced as a semicircular flap 
mesally, apicolaterally with sclerotized, pouchlike invaginations; 
bursa copulatrix short with a pair of jawlike apical processes. 
Larva, PUPA, CASE.— Unknown. 
MarteriaLt.—Dominica, Cabrit Swamp, 23 Feb. 1965, W. W. Wirth, 129; 
same, but 18 June 1964, O.S. Flint, Jr.,207 29. 
