1975] 
Mock ford — Eremopsocus 
245 
I have examined 15 adult specimens of this species from two 
localities in central Brazil, ;and I find that all individuals of both 
sexes have antennae incrassate. I believe that McLachlan’s observa- 
tion was incorrect and that the error arose from his having had 
more than one large, fuscous-winged Cerastipsocine species in his 
material. There are several such species in Brazil. Those with 
slender flagellomeres in both sexes are currently assigned to Cera- 
stipsocus. The argument for McLachlan’s having had a mixture of 
species is strengthened by another of his observations: that males 
have wings shining, while females have them dull. Pinned specimens 
in the series of E. infumatus which I studied have the wings shining 
in both sexes while pinned specimens of Cerastipsocus fuscipennis 
(Burmeister) received in the same shipment from a nearby locality 
in Brazil have the wings dull. I conclude that the flagellomeres of 
both sexes of E. infumatus are incrassate and that Pearman’s Vene- 
zuelan subspecies has no validity. 
Pearman (1933) described the genitalia of both sexes of E. in- 
fumatus. The hypandrium is symmetrical and bears an apically 
rounded lobe in the middle of the disc; distally, it bears a pair of 
blunt, posteriorly-directed prongs. This hypandrium differs from 
that of the type of Cerastipsocus ( C . fuscipennis [Burmeister], 
designated by Roesler [1944], not C. venosus [Burmeister], erron- 
eously designated by Smithers [1967]). 
In C. fuscipennis , there is no trace of a rounded lobe in the middle 
of the disc and distal prongs are absent. This type of hypandrium 
has been illustrated for C. cubanus Enderlein (Mockford, 1974: 
164, Fig. 1 18) and C. venosus Burmeister (Chapman, 1930, pi. 
XIII, Fig. 9). C. beaveri New (1972: 207, Fig. .^2) is much the 
same but its hypandrium has a pair of short, laterally directed 
distal prongs. 
The distinctive hvpandria of the types of Eremopsocus and Cera- 
stipsocus provide useful character complexes for distinguishing be- 
tween these two genera. Unfortunately, these complexes do not 
correlate with the distribution of incrassate and slender flagellomeres 
in the species as currently assigned in these two genera. Thus E. 
reductus (Banks) has the flagellomeres developed as in E. infumatus 
but the hypandrium as in C. venosus, completely lacking a lobe in 
the middle of the disc and without distal prongs (personal observa- 
tion). C. crassicornis (Kolbe) in which the male has only the first 
flagellomere incrassate and the flagellomeres of the female are slender 
has the hypandrium developed as in E. infumatus (personal obser- 
vation). 
