1948] 
D e nnin g — N ear die Trichoptera 
19 
species by the short stocky tenth tergite, the shape of the 
cerci and claspers and the presence of 3 subapical spines 
on the lateral arm of the aedeagus. 
Male. — Length 14-15 nun. Fore wings tawny except 
for irregular dark brown markings along the veins and a 
concentration of irregular dark brown markings from the 
cubitus to the inner margin of the wing. Front femur 
with a linear patch of black spinules along under side and 
with 2 small apical spines ; front basitarsus subequal to 
following segment; front tibia with 8 to 10 black spines 
including one apical pair. Eighth tergite with mesal pro- 
jection covered with black spinules. 
Genitalia as in fig. 4. Ninth segment with lateral por- 
tion wide, markedly reduced to a narrow bridge dorsally, 
portion next to cerci arcuate. Lobes of tenth tergite very 
short and stocky, apex small and only slightly upturned. 
Cerci, from lateral view, only a trifle longer than wide, 
posterior margin slightly sinuate ; convergent from dorsal 
view and with an acute apex; viewed from caudal aspect, 
fig. 4A, mesal margin black and sharply bent mesad. 
Claspers longer than wide, sides practically parallel, dor- 
sal and ventral corners rounded, a small acute projection 
along distal margin. Lateral arms of aedeagus fig. 4B, 
shorter than main body, apically enlarged into a lobe 
bearing a brush of fine setae, apex acute, just caudad to 
apex occur three small spines as in fig. 4B. Apparently 
some modification of these subapical spines may occur, as 
on one lateral arm of the paratype the most ventrad spine 
is considerably elongated, fig. 4C. 
Female. — Length 16 mm. Genitalia as in fig. 4D. Same 
color and general structure as male. Ninth segment com- 
pletely divided dorsally. Tenth tergite tubular, apex at- 
tenuated, bifid from dorsal view, fig. 4E. 
Holotype. Male. — Callao, Juab County, Utah, August 
7, 1945 (G. F. Knowlton), at light. [U. S. National Mu- 
seum Collection.] 
Allotype. Female. — Same data as for holotype. 
Paratype. Male. Same data as for holotype. 
Holotype and allotype deposited in the U. S. National 
Museum. 
