226 
The Ohio Naturalist. 
[Vol. II, No. 5, 
gena, or cheek. The fore wing or elytron, f, has a triangular 
clavus extending along the inner or hinder part and separated 
from the rest of the wing by the claval suture. It includes two 
claval veins. From the base of the wing two principal veins run 
toward the apex. They are called the first and second sectors, 
or sometimes the radial and ulnar sectors. The first is usually 
forked and the inner fork of first sector connected to the second 
figured, Dcltocephalus inimicus Say, is one of our most abundant 
species and occurs in blue grass over a very wide range of terri- 
tory in the United States. 
For systematic study of these insects, Van Duzee’s “Synopti- 
cal Arrangement of North American Jassidae’’ and “ Catalogue 
of the Described North American Jassoidea” are indispensible. 
.Scattered papers by the same author, Uhler, Fitch, Stal, Pro- 
vancher, Woodworth and others are more or less essential. 
Gillette and Baker’s “ Hemiptera of Colorado,’’ Gillette’s 
“ Typhlocybinae,” Osborn and Ball’s “Review of the Genus 
sector by one or two trans- 
verse veins. The cells at 
tip of wing are the apical 
and those next to them the 
ante-apical, while those 
next the costal margin are 
costal cells. The genitalia 
are of great importance for 
separating species in some 
of the genera. The female 
ventral segments, d, show 
a terminal ventral segment 
beyond which are two side 
pieces, including the ovi- 
positor. The side pieces 
are termed pygofers, though 
more properly the}- are the 
ventral margins of the 
pygofer or terminal seg- 
ment. The male, c, has 
following the last complete 
segment a variously shaped 
partial segment, the valve, 
following which are two 
plates that are usually tri- 
angular in outline and dor- 
cl I let , J . wing , g , itxi \ a. 
(After Osborn and Ball.) 
of the pygofer. The larva 
is shown at g. The species 
