September, 1941 
River Canyon State Park, Argo, Bowman- 
ville, Chicago, Elizabeth, Fort Sheridan, 
Galesburg, Geneseo, Ingleside, Lake Villa, 
Normal, Oquawka, Palos Park, Port Byron, 
Riverside, Roby, Rockford, Savanna, Ur- 
bana, Waukegan, White Pines Forest State 
Park. 
Mesomiris Reuter 
No Illinois species; Mesomiris curtulus 
Reuter is known from Colorado eastward 
to Pennsylvania and Connecticut. It has 
not yet been collected in I\linois, but should 
be found here eventually. 
CAPSINAE 
REve LOS URIBES 
1. Elongate antlike species, figs. 180, 181; 
abdomen constricted at base; lateral 
margins of pronotum indistinct, more 
or less sinuate; emboliar margins of 
hemelytra recurved ventrad....... 
(OED Myrmecorini, p. 209 
Not antlike, figs. 154, 155; abdomen 
not distinctly constricted at base; 
pronotum with lateral margins dis- 
tinct, frequently finely carinate; 
hemelytra with emboliar margins 
straight or slightly arcuate, not re- 
Bro CV eNtradecc tr. ack «ii hes v 
= : 
PERITREME 
ALMOST 
147 “ABSENT 
Fig. 147.—Thorax of 
Opistheuria clandestina. 
Fig. 148.—Thorax of 
Lygus oblineatus. 
Fig. 149.—Protho- 
rax of Platytylellus fra- 
ternus. 
2. Ostiolar peritreme small, indistinct, fig. 
147, its dorsal margin scarcely ex- 
tending dorsad as far as ventral mar- 
gin of mesepimeron; body impunc- 
tate; pronotal collar broad, strongly 
convex, mesal length of collar usually 
aepereatas width of calli... 34:-.. 
str b ter okt Resthenini, p. 131 
KNIGHT: PLANT Bucs, or Miripaz, oF ILLINOIS 
13 
Ostiolar peritreme prominent, fig. 148, 
its dorsal margin extending well 
above ventral margin of mesepime- 
ron; dorsum frequently punctate; 
pronotal collar not so broad and 
prominent as above. . .Capsini, p. 136 
RESTHENINI 
KBY TO,GENERA 
Stricture of pronotal collar joining base of 
coxal cleft, fig. 147; head oblique as 
viewed from side; gula rather long, ob- 
Liq UGE ERR pete eho Opistheuria, p. 131 
Stricture of pronotal collar interrupted at 
side, not joining directly with base of 
coxal cleft, fig. 149; head short, vertical; 
gula short, scarcely apparent......... 
AUR A ee ce oe Mee Platytylellus, p. 132 
Opistheuria Reuter 
Opistheuria clandestina Van Duzee 
Opistheurta clandestina Van Duzee (1915, 
p, £10), 
Matcet.—Length 7.00, width 2.80. Head 
width 1.30, vertex 0.61. Rostrum, length 
1.90, reaching to middle of intermediate 
coxae. Antennae black; first segment, length 
1.08, slender, 0.13 thick, clothed with long, 
suberect, fuscous hairs; second, length 2.20, 
cylindrical ethird, .!./0;.tourth) 1.008. Pro- 
notum, length 1.43, width at base 2.20. Em- 
boliar margins distinctly arcuate on apical 
half. Clothed with erect, rather short, pale 
pubescence, longer and more fuscous on legs 
and antennae. Color orange red; antennae, 
front and tylus, all but central area of disk 
of scutellum, all but outer margins of hem- 
elytra, and genital segment, black; legs 
black; coxae reddish; femora more or less 
pale at base. 
FEMALE.—Length 7.10, width 3.00. More 
robust than male, but very similar in color 
and pubescence. 
All our Illinois specimens but one have 
the pronotal disk variously marked with 
black and are referable to the variety dor- 
salis Knight (1918d, p. 115); the exception 
is the single female from West Pullman 
which has the venter more or less fuscous 
or black and belongs to the variety ventralis 
Knight (1918d, p. 115). 
Hasits.—Occurs on willow (Salix sp.) 
and beans (Phaseolus spp.). 
