126 Proceedings of the Biological Societi/ of Washington. 
may liave the following pale markings: spots antero-laterad of 
each coxa, front mai’gin of prostethium, triangular outline or 
area on underside of head, and whole of legs. The coxae them¬ 
selves and nari’ow lateral margins of abdominal segments also 
are commonly pale. 
Because of this uniformity of lower surface, little attention is 
paid to that part of the body in tlie following pages. Unless 
otherwise stated, it will he understood that descriptions of form 
as well as color apply to the insect as viewed directly from above. 
The typical color pattern is most persistent on liack part of 
head, middle of pronotum, base of scutellum and inner angle 
of corium. These parts should be scrutinized when there is 
doubt as to the ground color. 
All of the species may have brachypterous forms, and these 
sometimes differ remarkably in appearance from the typical 
aspect. These short-winged specimens appear more oval and 
broader, this being intensified by the fact that the hemelytra 
usually are not overlapped so closely as in perfect-winged indi¬ 
viduals. This condition also alters the apparent shape of the 
scutellum, allowing more of it to be seen. The corium of 
brachypterous specimens is invariably more densely and uni¬ 
formly punctate than in the macropterous forms. 
Finally it should be remembered that there are few hard and 
fast lines and that it can not be expected that a key will be 
simple and unerring when the group it is intended to analyze is 
complex and confusing. 
Key to the genera of Geocorin^ of the World. 
The following key is made largely from descriptions and for that reason 
is undoubtedly less satisfactory than would be the case were specimens of 
all the groups in hand. 
A. First joint of antenna longest; clavus widened posteriorly; eyes on 
long slender styles, directed outward and forward. 
Bpipolops Herrich-Schaeffer. 
AA. First joint of antenna shortest; clavus not at all or only slightly 
widened posteriorly. 
B. Eyes somewhat pedicillate. 
C. Part of head bearing eye not at all or very little retrorsely 
produced, and not fitted to anterior angle of the pronotum. 
Tylus short, not sulcate; clavus with sides subparallel or 
feebly divaricate posteriorly. Odoriferous orifices scarcely 
"^'isible. OphthaJmocoris Montandon. 
