VOLUME 55, NUMBER 1 
31 
m (4900'), 6 August 1968, R. C. Gardner, C. S. Glaser, T. A. Sears. Para- 
types. 2 males. Same data as for holotype. 
Types deposited Entomology Department, University of California, 
Davis. 
Helicopsyche rentzi, new species 
This species bears little resemblance to other described species. Diag¬ 
nostic characters: ventrad projected tergum 10; ventral angled phallus; 
straight dorsal margin of clasper; narrow mesobasal lobe of clasper. 
Male .—Length 5 mm. General color luteous. Antennal scape equal in 
length to next 4 segments. Mesh-like reticulation on sterna 3, 4, 5 cephalic 
margins brown; terga cephalic margins brown, excisions wide, shallow. 
Mesal lobe on sternum 6 non-pigmented, about half width of segment (Fig. 
4A). Genitalia, Fig. 4. Sternum 9 narrow, in absence of a pigmented lateral 
apodeme, demarcation of tergum 9 difficult to discern. Cerci small, elongate. 
Tergum 10 directed sharply ventrad, apex subacute; from dorsal view distal 
half not discernible due to sharp ventral angulation; the setose semicircular 
lateral area best viewed from lateral aspect. Clasper base narrow; greatly 
enlarged dorsal portion with ventral and dorsal margins subparallel; apex 
attenuated, subacute, black; a brown pigmented line discernible in cleared 
specimens on lateral surface (Fig. 4); from ventral aspect (Fig. 4B), mesal 
lobe narrow, apex obliquely truncate with dense, brown spicules. Phallus 
angled abruptly ventrad. 
Female .—Length 5.5 mm. Color, general structure similar to male. Sterna 
3, 4 with mesh-like reticulation; all cephalic margins of sternites dark brown. 
Sternum 6 with lightly pigmented subacute mesal lobe, about half width of 
segment; distal margin bearing dense brown setae (Fig. 4C). Sternum 8 with 
submarginal narrow band of dense dark brown setae; tergites deeply ex¬ 
cised, cephalic margins dark brown, especially on terga 5, 6, 7, 8. Tergum 
11, dorsal aspect, with elongate brownish lobes densely setate. Bursa cop- 
ulatrix, ventral aspect, as in Fig. 4D. 
Holotype. —Male, Costa Rica: Guanacosta, Finca La Pacifica, 10 miles 
north Canas, 10 February 1969. David C. Rentz. Allotype. Female. Same 
data as for holotype. 
Type to be deposited in Academy of Sciences, Golden Gate Park, San 
Francisco, California. 
Named in honor of Dr. David C. Rentz, who has collected many very 
interesting Trichoptera. 
Helicopsyche sinuata, new species 
This species is remarkably different from the four species known from 
North America north of Mexico. Diagnostic characters: phallus curved 
