GENUS EREMOPSOCUS McLACHLAN: DISTINCTION 
FROM CERASTIPSOCUS KOLBE AND REVIEW OF 
SPECIES (PSOCOPTERA: PSOCIDAE)* 
By Edward L. Mockford 
Department of Biological Sciences 
Illinois State University 
Normal, Illinois 61761 
During investigation on the systematics of Cerastipsocus and its 
close relatives, I have experienced difficulty in assigning species be- 
tween the two genera Erejnopsocus and Cerastipsocus. In this paper, 
I attempt an unequivocal definition of these genera. I also include 
diagnoses of the species placed by the new definition in Eremopsocus , 
and a reconsideration of geographic variation in the type species, E. 
infumatus McLachlan. The subgenera of Eremopsocus are also re- 
evaluated. One new species is described. 
Measurements (Table II) were made on whole specimens either 
pinned or temporarily mounted in glycerine. They are in mm and 
have an error of ± 1.04 microns. Abbreviations used with the mea- 
surements are explained as follows: C, f 2 = lengths of first and 
second flagellomeres; Fw — forewing length; F = length of pos- 
terior femur; T = length of posterior tibia; ti, t 2 = length of 
first and second posterior tarsomeres; t x ct “ number of ctenidia on 
posterior first tarsomeres; IO/D = least distance between com- 
pound eyes in dorsal view divided by greatest santero-posterior di- 
ameter of eye in dorsal view; PO = greatest transverse diameter 
of compound eye in dorsal view divided by greatest antero-posterior 
diameter of the eye in same view. 
Characters of Eremopsocus and distinction from Cerastipsocus . — 
Eremopsocus McLachlan (1866) was erected for a single large 
Brazilian species, £„ infumatus, with fuscous wing membranes. This 
species was reported to have incrassate flagellomeres in the male 
only, those of the female being slender. This antennal character, 
alone, was held to separate the genus from Psocus, which was then 
used in a very broad sense. 
Pearman (1933) correctly aligned Eremopsocus with its close 
relatives by placing it in subfamily Cerastipsocinae of Family 
Psocidae. Pearman’s material, from Venezuela, showed incrass'ate 
flagellomeres in both sexes, and on that account, he designated a 
distinct subspecies, E. infumatus venezuelensis. 
* Manuscript received by the editor August 15, 1975. 
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