NO. 3660 MICROLEPIDOPTERA, XVII—CLARKE 47 
Lasiothyris Meyrick 
Lasiothyris dysmorphia, new species 
Figure 25; Puats 2 (ria. 6) 
Alar expanse 14 mm. 
Labial palpus pale buff with fuscous irroration on outer side. 
Antenna grayish, finely spotted with fuscous basally; scape pale buff 
with fuscous irroration dorsally. Head pale brown, mixed with buff 
laterally; face buff. Thorax buff, mixed with pale brown and fuscous; 
tegula brown, narrowly edged with buff. Forewing ground color pale 
buff, irregularly irrorate with fuscous and spotted with pale brown; 
from basal fifth of costa almost to inner angle an ill-defined, brown, 
basal patch; from slightly beyond middle of costa to dorsum a poorly 
defined, irregular, brown, transverse fascia that extends narrowly 
along dorsum to basal third; at apical fifth of costa a quadrate brown 
blotch; apical area mottled brown; underside strongly infuscated; 
cilia mixed buff, brown, and fuscous. Hindwing pale buff, slightly 
shaded fuscous and with fuscous irroration around anal angle; costal 
hairpencil of male with black spot near outer end. Foreleg buff; 
femur and tibia fuscous on outer side; tarsal segments broadly banded 
with fuscous; midleg similar to foreleg; hindleg buff; femur with 
slight fuscous marking basally on outer side; tibia with sparse fuscous 
scaling at bases of spurs. Abdomen grayish with some heavy fuscous 
scaling dorsally; ventrally ocherous white, irrorate with grayish 
fuscous; anal tuft ocherous white. 
Male genitalia slides JFGC nos. 11233, 11628. Harpe very broad 
basally, abruptly narrowed toward cucullus; cucullus expanded into 
two widely separated parts; sacculus produced into a long, curved 
point, the latter preceded by a dense patch of long, stiff setae and 
a sharp longitudinal ridge. Uncus absent or only faintly indicated. 
Socii fused along median line, flattened, and with a circular terminal 
excavation. Vinculum coalesced, broad. Transtilla arched and with 
double-keeled, median process fused distally. Tegumen very short, 
arched. Anellus a U-shaped, sclerotized plate. Aedeagus long, slender, 
curved, terminating in a blunt point; vesica armed with a single, 
short cornutus. 
Holotype: U.S. National Museum No. 69739. 
Type-locality: Bolivia, Cochabamba, Incachaca. Tropical cloud 
area, 2100 m. 
Distribution: Known only from the type-locality. 
Described from the male holotype (27.VIII-5.1X.56. L. Pejia), and 
one o paratype with the same data. 
The extraordinary male genitalia immediately distinguish dys- 
morphia from any of the related species. It appears to be more closely 
