NO. 3665 CADDISFLIES——FLINT 59 
Genus Ochrotrichia Moesly 
Ochrotrichia Mosely, 1934, p. 162. [Type-species: Ochrotrichia insularis Mosely, 
1934, by original designation.] 
The genus, which is of exclusively New World distribution, is 
divided into two subgenera, Metrichia and Ochrotrichia. The adults 
of the former are easily recognized by the presence of an apical spur 
on the foreleg. 
The mature larvae inhabit compressed, purse-shaped cases, similar 
in appearance to those of Hydroptila. To date no characteristics have 
been found that will serve to separate the larvae of the two subgenera. 
The larvae of Metrichia were described by Flint (1964b); 
Ochrotrichia, by Ross (1944). 
Key to Species 
ADULTS 
1. With claspers and aedeagus: males. 
Without claspers and aedeagus: females . 
2. Foretibia without apical spur . 
Foretibia with apical spur . a, 
3. Clasper short with posterior margin developed ie meas spurs. 
O. spinosissima 
aw NT bb 
Clasper elongate, not developed into spurs. . . . Figg ee 
4. Clasper elongate, paralled sided, produced into an pcodersl leben O. brayi 
Clasper shorter, higher, hind margin bilobate. . . ... . . . O. ponta 
5. Abdominal segments 4 and 5 with hair tufts and inter sacs. 
O. exclamationis 
These segments unmodified. . ... Se Seer CoO! 
6. Apicodorsal lobe of clasper narrowed ara deveined ‘invies a ue . O.campana 
Apicodorsal lobe pointed, but not spurlike. . ....... . .. O.similis 
Pemitboutapical spur omforetibia. ps. 2.) ft 0 os cs ee we 
With apical spur on foretibia. . . . . PRs dae ata ey A) 
8. Eighth sternum with a tongue-like process o pagina. . . O. spinosissima 
Highth sternum with a small mesal lobe. . ....... 2... O.ponta 
9. Eighth sternum with a large internal sclerite. . .... . . O. species 2 
Highth sternum with a posterior collar, but no internal plate . . O. species 1 
Ochrotrichia (O.) spinosissima Flint 
Fiaures 159-163 
Ochrotrichia spinosissima Flint, 1964b, p. 58. 
The species was described from Puerto Rico. The shape of the 
clasper and aedeagus is distinctive. 
The female is ascribed to this species primarily on coloration, which 
is quite different in O. brayi, the only other species of the subgenus 
in which the female is unknown. 
Apu.t.—Length of forewing 2-2.5 mm. Color black, legs annulate, 
forewing with a narrow transverse white band, and small white spots 
