September, 1941 
6. First and second antennal segments 
10. 
rl, 
Ee. 
$5: 
thickly clothed with heavy black 
pubescence, fig. 155; large red 
Beco MiCHythits.QUtcveen a. 20... 
Ae Coccobaphes, p. 138 
First antennal segment more sparsely 
clothed with pale pubescence, fig. 
Poo sizeviessithan 7:50:7......... r) 
Pronotum with lateral margins sharp- 
ly angulate, carinate near posterior 
angle; body red and black, fig. 159. 
2. a Neocapsus, p. 147 
Pronotum with lateral margins round- 
ed or angulate, but not carinate... 8 
Rostrum extending to fourth or fifth 
abdominal sternite; dorsum glab- 
rous;.......... Platylygus, p. 147 
Rostrum rarely extending beyond tips 
of hind coxae; if so, then dorsum 
Mistinctly pubescent.;.......:... D 
Pronotum very finely punctate, fig. 
152.4; body integument more thinly 
enicinized, more frasile....)..,.<. 
cca re Neolygus, p. 154 
Pronotum coarsely, or at least dis- 
tinctly punctate, fig. 152B; body 
integument heavily chitinized..... 10 
Second antennal segment distinctly 
more slender at base, fig. 162; lat- 
eral margins of pronotum angulate. 
5 53 lee Lygus, p. 148 
Second antennal segment cylindrical, 
scarcely more slender at base, fig. 
158; lateral margins of pronotum 
BGC. Gis o.. Lygidea, p. 145 
First antennal segment thickened, 
clothed with numerous flattened 
hairs, fig. 172. .Neurocolpus, p. 181 
First antennal segment devoid of 
Settencd hairs, fig. 170... 2.0. a. 12 
Pronotum with two subexcavated, 
dull, black spots situated behind 
the callosities, fig. 170; first anten- 
nal segment clothed with long black 
Peetteranid Seta sf. cess ee ee os 
Te ss Paracalocoris, p. 176 
Pronotum without black spots, or 
with only superficial ones, and with 
first antennal segment without 
prominent, long, black setae; length 
of hairs on first antennal segment 
rarely exceeding thickness of seg- 
Second antennal segment thickened; 
somewhat spindle shaped, fig. 171 
a Garganus, p. 181 
KNIGHT: PLant Bucs, or Miripakz, oF ILLINOIS 137 
Second antennal segment linear, or 
only very slightly thickened at tip, 
Lie LOGS aeiamah ie rasene ee Fre me Aca 14 
14. Hind femora long, extending much be- 
yond tip of abdomen, and flattened, 
broadest before middle and more 
sleniden dita pexetlg-al 70) Geen 
ea, ote eee Phytocoris, p. 184 
Hind femora shorter, not or scarcely 
extending beyond tip of abdomen, 
LG Ml OS Sree Matt Me ee tg eles ox 15 
15. First segment of hind tarsus dis- 
finctly longertian-thitd see 
Se ee nd ai Stenotus, p. 175 
First segment of hind tarsus shorter 
CIAL ECHICC eee yes ee es 16 
16. Dorsal surface distinctly pubescent, 
UMN bod Rea: AMG Oya reat ae ew tl ahs ell ee 17 
Dorsal surface glabrous, highly pol- 
Perec lig tl Gym ae erate ey eee or 20 
17. Body above and below clothed with 
silky or woolly pubescence....... 
Le eee Polymerus, p. 166 
Body clothed only with simple pubes- 
CENCE TICVeIE WOO Ve wees 4a a 18 
18. Head broad, eyes practically in con- 
tact with pronotal angles, hind 
margins of eyes somewhat flattened 
and forming an arcuate line with 
base of vertex, fig. 166, .4...5... 
Ey i boat ea Dichrooscytus, p. 165 
Head not unusually broad, eyes con- 
vex behind and well removed from 
pronotalpanelesssngs 1OGe. eee 12 
19. Thickness of fourth antennal segment 
almost equal to that of base of 
second segment; mesal length of 
collar subequal to thickness of 
fourth antennal segment, fig. 168. . 
ihe 5, oc meet Adelphocoris, p. 174 
Fourth antennal segment distinctly 
thinner than base of second seg- 
ment; mesal length of collar dis- 
tinctly greater than thickness of 
fourth segment....Calocoris, p. 137 
20. Rostrum short, scarcely surpassing 
ANCETIO RA COX AC. aemnmei gre ein ee 
Sse een Poecilocapsus, p. 172 
Rostrum longer, at least reaching 
posterior margins of middle coxae. . 
CIR a ic 18 ee: Horcias, p. 172 
Calocoris Fieber 
No Illinois species; Calocoris norvegicus 
(Gmelin) is a European species now known 
