122 
Psyche 
[December 
to those from Trinidad, Specimens from Panama are us- 
ually larger in size, with a more pallid coloration, little in- 
fuscation, the membrane brownish and the scutellum fre- 
quently yellowish and not black. Possibly they represent 
a distinct geographic race. I have been fortunate in being 
able to examine a long series from the same locality in 
Guatemala (23 $ $ and 34 $ $ ), in which every shade of 
variation occurs between specimens which are identical 
with those from Trinidad, with the hemelytra immaculate, 
and specimens which agree with the descriptions given by 
Say (1832) and Stal (1854), having the whole posterior 
disc of the pronotum infuscate and a large, inwardly di- 
rected, black fascia on the corium. 
Specimens from Mexico, Honduras, Salvador and Costa 
Rica follow the same course of variation, while in a number 
of specimens from Ecuador the fascia on the corium covers 
the whole of the apex. 
All these different color varieties share the characteris- 
tic parameres described above and may be recognized on 
superficial examination by the unicolorous antennas, the 
fact that the lateral flanges of the pronotum are luteous and 
not, as is usually the case, the same color as the anterior 
callus, by the infuscation of the discs of the posterior abdo- 
minal sternites in the female and usually by the black 
scutellum. It may be remarked that forms of D. mimus 
Say with the hemelytra immaculate may be difficult to dis- 
tinguish from similarly pallid forms of D. mimulus Hussey, 
bu.t it is possible to do so from the fact that D. mimulus 
rarely has the disc of the pronotum immaculate, there be- 
ing usually a sharply defined posterior black margin, 
whereas in D. mimus the black fascia, where it occurs, 
merges indefinably into the paler color. Moreover, in D. 
mimulus the black anterior margins to the abdominal ster- 
nites are relatively broader and more sharply defined than 
in D. mimus. 
An examination of the male parameres, of course, reveals 
the nature of a doubtful specimen immediately. 
In Trinidad this species is found feeding and breeding 
on the same plants as support the two preceding species, 
but it is distinguished by its penchant for the low-lying 
