1975] 
Alockford — Eremopsocus 
247 
It is my opinion that the hypandrium in these insects presents 
more information than the relative widths of flagellomeres and that 
the two genera can best be recognized on the basis of type of hypan- 
drium. This opinion is strengthened by the fact that no intermediate 
type of hypandrium has been found, whereas flagellomeres of different 
species show varying degrees of incrassation. 
In order to test this opinion further I have searched for additional 
characters showing essentially two states in the assemblage of species 
under consideration and noted how their states are distributed. The 
following characters were found : 
( 1 ) shape of posterior clunial margin of male in region of base 
of epiproct: slightly protruding and bilobed (Fig. 8) or decidedly 
protruding and not 'at all bilobed (Fig. 5) ; 
(2) presence (Fig. 5) or absence of a protuberance immediately 
distad of sense cushion on paraproct in male; 
(3) relative length of stem of dark T-shaped mark of female 
subgenital plate (stem of vase-shaped figure extending into distal 
process of plate) : either more than twice as long as broad or scarcely 
longer than broad to much shorter than broad. 
The following species were examined (assigned to genera accord- 
ing to current usage): Cerastipsocus bogotanus (Kolbe), C. crassi- 
cornis (Kolbe), C. cubanus Enderlein, C. fuscipennis (Burmeister), 
C. 1 ochraceocristatus Enderlein, C. sivorii Ribaga, C. trifasciatus 
(Provancher) , C. venosus (Burmeister), two undetermined species 
of Cerastipsocus , Eremopsocus inf.umatus McLachlan, and E. re- 
ductus (Banks). 
The data are summarized in Table I. From this table, the fol- 
lowing correlations are seen: 
1. Incrassate flagellomeres correlate with hypandrial type of E. 
infumatus. The notable exception is E. reductus, while C. cubanus 
shows slight incrassation. 
Explanation of Figures 1-8 
Fig. 1 . Eremopsocus crassicornis (Kolbe) $, forewing, scales in mm. 
Fig. 2. E. crassicornis (Kolbe) $, hindwing. Fig. 3. E. crassicornis 
(Kolbe) $, hypandrium. Fig. 4. E. crassicornis (Kolbe) $, phallosome. 
Fig. 5. E. crassicornis (Kolbe) £, epiproct, left paraproct, and adjacent 
clunial margin, scale of Fig. 3. Fig. 6. E. crassicornis (Kolbe) $, antenna 
(scape to base of f 3 ), scale of Fig. 1. Fig. 7. E. crassicornis (Kolbe) $, 
antenna (scape to base of f 3 ), scale of Fig. 1. Fig. 8. Cerastipsocus venosus 
(Burmeister) $, epiproct, base of right paraproct, and adjacent clunial 
margin. 
