SO ILLINo1is NATURAL History SURVEY BULLETIN 
from Anna, Antioch, Beach, Browns, Bu- 
reau, Champaign, Dolson, Golconda, Grand 
Detour, Herod, Makanda, Marshall, Mount 
B 
STYG/CUS 
A 
ATRITIB/ALIS 
(Rae) 
PALLIPES 
V ol. 22; Artme 
Illinois Records.—Thirty-five males and 
44 females, taken May 12 to July 15, are 
from Algonquin, Antioch, Browns, Charles- 
A 
ee BREVIATUS 
8 
(Ahiee (UES 
was 
A 
A 
AMBROSIAE 
Fig. 114.—Male genital claspers of Strongylocoris. A, left clasper; B, right clasper. 
Carmel, Oakwood, Oregon, Pulaski, Shaw- 
neetown, Urbana, West Union. 
Strongylocoris atritibialis Knight 
Strongylocoris atritibialis Knight (1938, p. 2). 
This species is distinguished from stygicus 
(Say) by its more arcuate hemelytra, black 
tibiae and the structure of the male genital 
claspers, fig. 114. 
Mace.—Length 4.60, width 2.40. Head 
width 1.21, vertex 0.65. Antennae black; 
length of first segment, 0.34; second, 1.26; 
third, 1.00; fourth, 0.43. Pronotum, length 
1.12, width at base 1.77. Hemelytra with 
costal margin strongly arcuate. Dorsal sur- 
face nearly glabrous, rugulose, punctate, 
sparsely clothed with fine, short pubescence, 
which is more evident on cuneus and embo- 
lium. General coloration deep black; mem- 
brane very dark brown; legs black; tibiae 
and tarsi sometimes very dark brown, but 
hind tibiae always black. Genital claspers 
distinctive for species, fig. 114. 
FemaALe.—Length 4.50, width 2.50; em- 
boliar margins more strongly arcuate than 
in male. Form more robust than in male, 
but: very ‘similar in coloration. 
Known DistripuTion.—Widely distrib- 
uted in eastern United States and ranging 
westward into Alberta, Colorado, Wyoming. 
ton, Dolson, Dongola, Fountain Bluff, 
Galena, Galesburg, Grand Detour, Grays- 
lake, Havana, Herod, Joliet, Makanda, 
Muncie, Pulaski, St. Anne, Shawneetown, 
Sheldon, Volo. 
Strongylocoris hirtus Knight 
Strongylocoris hirtus Knight (1938, p. 4). 
This is distinguished from allied species 
with erect pubescence by the longer second 
antennal segment, which exceeds the width 
of the head across the eyes; the tibiae and 
first antennal segment are pale and the male 
genital claspers are distinctive, fig. 114. 
Mave.—Length 4.60, width 2.20. Head 
width 1.12, vertex 0.56. Antennae, first seg- 
ment, length 0.38, pale, base fuscous; second, 
1.43, black, basal one-fifth pale; third, 0.86, 
black ; fourth, 0.47, black. Pronotum, length 
0.98, width at base 0.16. Hemelytra with 
costal margin moderately arcuate on distal 
half. Clothed with thickly set, erect, golden- 
brown to black pubescence. General colora- 
tion black, shining slightly; legs mostly 
black, with tibiae, all but apical segment 
of tarsi, and apices of femora, pale; tibial 
spines fuscous. 
FEMALE.—Length 4.30, width 2.40. More 
robust than male, but very similar in color 
and pubescence. 
