McAtee—Key to Nearctic Genera and Species of Geocorinoe. 127 
CC. Part of head bearing eye somewhat retrorsely produced, 
paralleling or almost touching anterior angle of thorax. 
D. Tylus not sulcate. 
E. Clavus parallel-sided, commissure distinct. 
Germalus Stal. 
EE. Clavus attenuate at apex, commissure lacking. 
Slenophthalmicus Costa.* 
J)I). Tylus sulcate; Thorax much narrowed in front, part of 
head bearing eye extended laterally and constricted 
so that eye appears almost stalked; Bucculaesmall; 
second joint of beak subequal to first, thoracic cal¬ 
losities continuous or interrupted by only a few 
scattered punctures; scutellum notably longer than 
wide, almost plane, uniformly, but sparsely punc¬ 
tate; Clavus distinctly narrowed behind, commis¬ 
sure short. Isthmocoris new genus. 
Type species: Saida pice a Ssiy, included species: the 
type, Geocovisimperialis Distant and G. tristis Staff 
BB. Eyes not at all pedicillate. Geocoris Fallen.t 
Key to the Nearctic genera and species. 
A. Eyes entirely laterad of point of apparent junction of head and 
thorax; second joint of beak not noticeably shorter than first. 
Isthmocoris. 
B. Punctures on corium mostly confined to the margins, chiefly 
near clavus. I- impe7'ialis Distant. 
BB. Corium more uniformly punctate. I. piceus Say. 
AA. Eyes not so protruding; second joint of beak noticeably shorter 
than first. Geocoris. 
C. Scutellum with lateral callosities; anterior angles of pro- 
notum evenly rounded. G. punctipes Say. 
CC. Scutellum without lateral callosities; anterior angles of 
pronotum usually truncate or angulately rounded. 
D. Scutellum olnfiously longer than wide (sometimes 
subequilateral in small specimens of G. bullatus 
Say and var. discopterus Stal), strongly convex or 
in i)art elevafi'cl, almost always bicolor. 
* See Piiton, A, et Lethierry, L. Heinipteres nouveatix de L’Algerie. Revue D’Eii- 
tomologie. VI. 1887, p. 301. 
t Moiittindou suggests (.Vuuiiles Musei Nalioualis Huugarioi, V, 1907, p. 90) tliat 
these species should be assigned to the genus (iermalus Stal. There are objections to 
this course, however. Germalus is described as having the buccidae distinctly elevated 
anteriorly, the clavus with sides parallel, and the tylus not sulcate. Isthmocoris impe- 
rialis and piceus, on the other hand, have the bucculae not more prominent than in 
our species ol Geocoris, the clavus distinctly narrowed behind, and the tylus sulcate. 
J For key to subgenera of Geocoris, see Stal, C., Genera Lygaoidaruni Kuropae 
disposuit. Ofv. Kgl. Vet. Akad. Forh., 1872, No. 7, pp. 45-4C. 
