ILLino1is NATURAL History SURVEY BULLETIN 
level of ventral margins of eyes, fig. 
LS Ui aa eerce ae Ilnacora, p. 82 
Base of tylus less angularly produced, 
not located ventrad of level of 
Vol. 22m Aris 
cence only; sometimes with a few 
silky-hairs.... ..... 2 
8. Pronotum and corium thickly clothed 
ventral margins of eyes, fig. 119; on 
a line with or considerably dorsad 
of level of ventral margins of eyes.. 4 
TYLUS 
TYLUS 
Fig. 116.—Head of Hadronema militare. 
Fig. 117.—Head of Lopidea confluenta. 
Fig. 118.—Head of J/nacora stalit. 
Fig. 119.—Head of Mecomma gilvipes. 
4. Second antennal segment thickened 
d tia Pex. (fits 1033 Aes eee nen eee 
Seah Sey an es Heterocordylus, p. 107 
Second antennal segment linear, 
Figs 259 y oc beaten iy tee neared ce ee 5 
5. First antennal segment with a longi- 
tudinal black line on either side, 
these lines connected on ventral 
sid exeated exe een = Reuteria, p. 92 
First antennal segment not marked 
with longitudinal black lines... ... 
6. Eyes rounded behind and set at or 
near middle of head, well removed 
from anterior margin of pronotum, 
figs OSes oe Diaphnidia, p. 91 
Eyes relatively straight behind and 
set close to anterior margin of pro- 
NOLUTete 20 eee ee eee 
7. Body clothed with scalelike hairs 
intermixed with more nearly erect 
bristles ity. .ehyerwan ene) athe! cee ee 
Body clothed with simple pubes- 
10: 
le 
with black and white, scalelike pu- 
bescence, with a few bristles; venter 
very dark, almost black; third an- 
tennal segment equal to three times 
the length of fourth segment; large 
fuscous species, length 5.50—-6.00. . 
em re DURA ee Noctuocoris, p. 105 
Pronotum and corium bearing numer- 
ous erect bristles intermixed with 
scattered scalelike pubescence, fig. 
152; venter light; third antennal 
segment not equal to three times the 
length of fourth segment; small 
species, length less than 5.00...... 
....Melanotrichus, p. 95 
Vertex with a carina at posterior mar- 
PIN. cease es os 10 
Vertex without a carina at posterior 
margin. ....: 1.10.0 er 11 
Head broad; width of vertex three 
times as great as dorsal width of an 
eye, fig21 30 sere Labopidea, p. 105 
Head not so broad; width of vertex 
not more than two times as great as 
dorsal width of an eye, fig. 129.... 
Sitar ee ee Orthotylus, p. 97 
. Head vertical, strongly compressed 
apically, fig. 119; as viewed from 
the side, tip of tylus projecting be- 
low posterior end for a distance 
equal to one-half height of eye; pro- 
notum sinuate at base and slightly 
so at sides; male and female dis- 
similar in form; female brachypter- 
ous, abdomen very broad, macrop- 
terous forms rare. ..... een 
Spiniced ae eee Mecomma, p. 95 
Head inclined, more prognathous; as 
viewed from side, tip of tylus not 
projecting below posterior end of 
gula for a space equal to half the 
height of eye; both sexes macrop- 
CEroUSs tease eae Cyrtorhinus, p. 95 
Ilnacora Reuter 
KEY TO SPECIES 
Length of first antennal segment ex- 
ceeding width of vertex........... 2 
Length of first antennal segment less 
than width of vertex. . pee 3 
