September, 1941 
mone bs, 19. WAUKEGAN: July 6, 1932; 
ool itia sp., |. H. Frison, 19. WiILLOow 
Sprincs: July 8, 1906, W. J. Gerhard, 
19, FM. 
Deraeocoris borealis (Van Duzee) 
Camptobrochys borealis Van Duzee (1920, 
p. 354). 
Not taken in Illinois; known from Michi- 
gan, Minnesota, Ohio, Wisconsin; occurs on 
alders. Male genitalia as in fig. 106. 
Deraeocoris grandis (Uhler) 
Camptobrochis grandis Uhler (18874, p. 230). 
Apu tts.—Length 6.40—-7.00, width 2.90- 
3.10. Distinguished by its long rostrum, 
which reaches the second abdominal ster- 
nite. Dorsum rather uniformly dark brown; 
median line of pronotal disk with a rather 
broad, pale stripe, but this area only slightly 
paler than that behind calli. Legs pale; 
apical half of hind femora and basal half of 
tibiae with two black annulations. Mem- 
brane uniformly pale smoky on the apical 
half. Male genitalia as in fig. 106. 
Hasits.—Occurs on hickory (Carya sp.). 
KNown DistrisuTION. — Illinois, Iowa, 
Maryland, New York, Ontario. 
Illinois Records.—NorTHERN ILLINOIS: 
19. CHAMPAIGN: June 15, 1888, at elec- 
maceueht, C. A. Hart. FRANKFORT: June 
8, 1933, on Carya sp., Mohr & Townsend, 
Bee 3D. 
Deraeocoris aphidiphagus Knight 
glad aphidiphagus Knight (1921, p. 
134 
Aputts.—Fig. 107. Length 5.80-6.10, 
width 2.90-6.10. Fusco-grayish to black, 
paler and translucent parts not stained with 
brownish; apical half of membrane infus- 
cated; tibiae with three black annulations; 
left genital clasper with a long horn at 
dorsal extremity, internal arm slender, fig. 
106. 
Hasits.—I have found this species breed- 
ing only on elm (Ulmus sp.), in curled 
leaves infested with Eriosoma americanum 
(Riley). Both nymphs and adults feed on 
the aphids and their honeydew excretions. 
The nymphs are coated with a white, wax- 
like material similar to that which covers 
the aphids, and in the early stages, at least, 
they are rather inconspicuous, as they live 
KNIGHT: PLANT Bucs, or MiripAgz, or ILLINOIS el 
among the aphids and their excretory prod- 
ucts. This species of mirid must be regarded 
as a beneficial species, as it reduces the num- 
bers of elm aphids. 
Known DistrinuTION.—Several eastern 
states; taken as far west as Arkansas, Colo- 
rado, Minnesota, North Dakota, South Da- 
kota. 
Illinois Records. — Twenty-one males 
and 13 females, taken June 5 to July 18, are 
Fig. 107.— Deraeocoris aphidiphagus, &. 
from Alto Pass, Antioch, Augerville, Cham- 
paign, Elgin, Frankfort, Galesburg, Grand 
Detour, Hardin, Lacon, Normandy, Ur- 
bana, Willow Springs. 
Deraeocoris quercicola Knight 
Deraeocoris quercicola Knight (1921, p. 138). 
ApuLts.—Length 5.50-5.80, width 2.40- 
2.80. General color fuscous to black. Calli 
black; apical half of membrane smoky, 
rarely as pale as in nitenatus Knight. Left 
genital clasper with a long dorsal horn that 
is very distinctive when contrasted with the 
form of the internal arm, fig. 106. 
Specimens of this species in which the calli 
are more or less pale, the hemelytra are 
pallid or yellowish, and the corium has a 
black spot in the middle, have been desig- 
nated variety pallens Knight (1921, p. 140). 
This variety and the typical one occur to- 
gether in Illinois. 
Hasits.—Occurs on white oak (Quercus 
