1975] 
Mock ford — - Eremopsocus 
249 
2. The protruding male clunial margin tends to correlate with 
the E. infumatus hypandrial type, while the bilobed male clunial 
margin tends to correlate with the C. venosus hypandrial type. This 
correlation is better than indicated on the table. In E. infumatus , 
C. crassicornis, and C. sp. no. 1, the protrusion is a thickened lip, 
while in C. cubanus and E. reductus it is only a thin rim, as in those 
species with the bilobed margin. 
3. The protuberance distad of the male paraproctal sense cushion 
tends to correlate with the E. infu?natus hypandrial type and absence 
of the protuberance with the C. venosus hypandrial type. Again, 
the correlation seems better than the table suggests, as the protuber- 
ance in E. infumatus , C. crassicornis, and C. sp. no. 1 is small and 
decidedly pointed, while that in C. bogotanus is low, larger, and 
rounded. 
4. The long stem of the T-shaped mark of the female subgenital 
plate shows complete correlation with the E. infumatus hypandrial 
type and the shorter stem with the C. venosus hypandrial type. 
From the above correlations, I conclude that the genera Eremop- 
socus and Cerastipsocus may be differentially defined as follows: 
Eremopsocus. — Antennae incrassate at least in male ; hypandrium 
with central lobe of disc; male clunial margin protruding above 
epiproctal base as a rounded, thickened lip; a pointed protuberance 
distad of male paraproctal sense cushion; stem of T-shaped mark 
of female subgenital plate more than twice as long as broad. 
Cerastipsocus. — Antennae incrassate or not; hypandrium lacking 
central lobe of disc; male clunial margin bilobed before base of 
epiproct or slightly protruding above epiproctal base but never de- 
veloped as a decidedly protruding, thickened lip; generally lacking 
a protuberance distad of male paraproctal sense cushion, or with a 
low, rounded protuberance; stem of T-shaped mark of female sub- 
genital plate little longer than broad to much shorter than broad. 
Assignment of species to Cerastipsocus and Eremopsocus. — I can 
affirm, either through examination of specimens or by existing pub- 
lished descriptions, the generic assignment of the following species 
according to the above definitions: 
Cerastipsocus. — C. fuscipennis (Burmeister) (type species), C. 
beaveri New, C. bogotanus (Kolbe), C. cubanus Enderlein, C. ochra- 
ceocristatus (Enderlein), C. reductus (Banks), new combination, 
C. siuorii (Ribaga), new combination, C. trifasciatus ( Provancher) , 
C. venosus (Burmeister). 
