72 ILtinois NATURAL History SURVEY BULLETIN 
alba), bur oak (Quercus macrocarpa), bass- 
wood (Tilia sp.) and hawthorn (Crataegus 
Spa) 
KNown DIstrinuTION.—A common spe- 
cies in the northeastern states; known also 
from Colorado, Iowa, Minnesota, New 
Mexico, and southeastward into Georgia 
and North Carolina. 
Illinois Records.—Thirty-two males and 
36 females, taken June 2 to July 16, are 
from Antioch, Apple River Canyon State 
Park, Champaign, Chicago, Elizabethtown, 
Frankfort, Galena, Galesburg, Grand De- 
tour, Keithsburg, Manito, Monticello, 
Mount Carroll, Urbana, Waukegan, White 
Pines Forest State Park, Willow Springs, 
Zion. Blatchley (19264, p. 900) also records 
this species from Glen Ellyn. 
Deraeocoris davisi Knight 
Deraeocoris davisi Knight (1921, p. 140). 
ApDULTS.—Length 5.30, width 2.50. Gen- 
eral color uniformly brownish black; legs 
and antennae chiefly pale, hind femora with 
an incomplete dark annulus on apical half; 
membrane with apical half very faintly but 
uniformly stained with brownish, veins and 
areoles darkened with brownish; closely re- 
lated to quercicola Knight, but the internal 
arm of left clasper more highly developed, 
fig. 106. 
Known DistriputTion. — An uncommon 
species, known only from Alabama, Illinois, 
New York, North Carolina, Texas. 
Illinois Records.—Poto: May 31, 1933, 
Ross & Townsend, 1 g. VIENNA: June 14, 
1934, savanna grasses, DeLong & Ross, 
On 
Deraeocoris nitenatus Knight 
Camptobrochis nitens Reuter (1909, p. 56). 
Preoccupied. 
Deraeocoris nitenatus Knight (1921, p. 141). 
Apu.Lts.—Length 5.70-6.00, width 2.00- 
2.90. General aspect very similar to guerci- 
cola Knight, but more highly polished, calli 
black around margins only. Dorsum rich 
brownish to dark brownish and piceous, fre- 
quently brownish on scutellum, but rarely 
black each side of median line. Brachium 
and apex of areoles dark fuscous, apical half 
of membrane practically clear; male genital 
claspers distinctive for species, fig. 106. 
Hasits.—Breeds on elm (Ulmus sp.), 
basswood (Tilia americana), and other 
trees, where it is predacious on the woolly 
Vol. 22, Art. 1 
aphid, Eriosoma lanigerum (Hausmann), 
and, probably, other aphids. 
Known DIistripuTION.—District of Co- 
lumbia, Illinois, Iowa, Maryland, Minne- 
sota, New England, North Carolina, Que- 
bec, Virginia. 
Illinois Records.—ANTI0cH: July 5-7, 
1932, on Tilia sp., IT. H. Frison ef aly tae 
GALESBURG: July 24, 1892,14,1¢9. 
Group C 
KEY LO °SBEGiES 
1. Dorsum practically glabrous, at most 
only sparsely and finely pubescent 
(not rubbed specimens), rarely with 
a few hairs at anterior angles of 
pronotum \°.....) 7. 2 
Dorsum heavily pubescent, at least 
with long hairs at anterior angles of 
pronotum:...: 0-2. a) 
2. Second antennal segment of female 
with prominent exserted hairs, length 
of hairs one and one-half times the 
thickness of segment where they 
occur. Second antennal segment of 
male as thick at middle as on the 
apical half, and length of exserted 
hairs equal to one and one-half times 
the thickness of segment. 42... =e 
tw sole ann laricicola, p. 73 
Second antennal segment of female with 
erect hairs but length of hairs barely 
equal to twice the thickness of seg- 
ment where they occur. Second 
antennal segment of the male slender 
on basal half, distinctly thicker on 
apical half than at middle; length of 
hairs not greater than maximum 
thickness of second segment........ 
CPG SR Ee 8, pinicola, p. 73 
3. Pronotum, hemelytra and legs uni- 
formly dark, sepia brown or black, 
semitranslucent areas stained with 
brownish; hind tibiae usually with 
distinct annulated pale bands on 
Apical) iia | tee nigritulus, p. 73 
Pronotum usually fusco-grayish or 
black; hemelytra fuscous to black, 
becoming paler in certain areas but 
not stained with brownish; legs very 
dark brown, hind tibiae sometimes 
with indistinct pale bands on apical 
half; front coxae, xyphus, lower mar- 
gins of propleura, gula, and sides of 
tylus; pale eee albigulus, p. 73 
