September, 1941 
Deraeocoris pinicola Knight 
Deraeocoris pinicola Knight (1921, p. 162). 
Aputts.—Length 5.70-6.00, width 2.60— 
2.90; calli margined or lined with black, 
antero-lateral angles invaded by light-col- 
ored areas; median line of front and areas 
just anterior to calli pale to ivory white; 
general color pale to grayish, darkened with 
black, not at all tinged with brownish. Male 
genitalia as in fig. 106. 
Hasits.—Occurs on white pine (Pinus 
strobus) ; predacious on Chermes pinicorticts 
(Fitch). This. species may also attack 
aphids, such as Cinara strobi (Fitch) and 
Eulachnus rileyi (Williams), which com- 
monly occur on white pines growing in IIli- 
nois. 
Known DistrispuTION. — Iowa, Minne- 
sota and states to the east where white pine 
grows. 
Illinois Records—WHITE PINEs For- 
Est oTATE PARK: July 4, 1932, on Pinus 
strobus, Dozier & Mohr, 1 9 ; June 4, 1933, 
on Pinus strobus, Ross & Townsend, | ¢. 
Deraeocoris Jaricicola Knight 
Deraeocoris laricicola Knight (1921, p. 164). 
Aputts.—Length 6.00-6.50, width 2.70- 
2.80; very suggestive of pinicola Knight, but 
slightly larger and more elongate. Antennae 
with prominent, exserted hairs; male geni- 
tal claspers distinctive, fig. 106. 
Hasits.—Occurs on larch (Larix lart- 
cina). 
Known DistrisuTIon. — Illinois, Indi- 
ana, Minnesota, New York. 
Illinois Records.—AntTiocH: July 5-7, 
ioc let. Frison e¢ al.,69. Vouo: June 
peel s0. Ross & Burks, 24, 2 9. 
Deraeocoris nigritulus Knight 
Deraeocoris nigritulus Knight (1921, p. 170). 
Not taken in Illinois. Breeds on Virginia 
pine (Pinus virginiana); known from Dis- 
trict of Columbia, Maryland, Ohio, Vir- 
ginia. Male genitalia as in fig. 106. 
Deraeocoris albigulus Knight 
Deraeocoris albigulus Knight (1921, p. 171). 
Not yet collected in Illinois. Occurs on 
pine; known from Indiana, Iowa, Michigan, 
Minnesota, New York; will surely be found 
in Illinois eventually. Male genitalia as in 
fig. 106. 
KNIGHT: PLANT Bucs, or MirIpAgE, oF ILLINOIS 73 
Group D 
Deraeocoris sayi (Reuter) 
Euarmosus sayi Reuter (1876, p. 76). 
ApuLts.—Length 7.40-7.90, width 3.40- 
3.80; distinctly hairy. Color chiefly black, 
with considerable variation in the color of 
the head, pronotum and scutellum. In the 
darkest form, var. unicolor Knight (1921, 
p. 177), these parts are mostly or entirely 
black; in the lightest form, var. sayi, most 
of them are reddish. Various intermediate 
conditions occur between these extremes, 
thcse taken in Illinois representing var. 
mirginata Knight (1921, p. 176), frontalis 
Fnight (1921, p. 177) and costalis Knight 
(1921, p. 177). Male genitalia, fig. 106. 
Hasits.—Occurs on oaks (Quercus sp.). 
Known DiIstripuTion.—Described from 
Texas and since found in Florida, Georgia, 
Illinois, Iowa, Massachusetts, Michigan, 
Minnesota, Mississippi, New York, North 
Carolina. 
Illinois Records.—NorTHERN ILLINOIS: 
Ze ae DOUTHERN) ILLINOIS?) 1°90 .. ,ALGON- 
QUIN fee Vi aye 2/n1 009 a1 6 | unem ois 
1900 23s oe ner lo, 6190 Nason = luce 
Cuicaco: June 9, 1 ¢. GALESBURG: Strom- 
Derewles Oo une.) 2=14 5 eel Oe uly: 
17, 1892, 19 ; June 14-19, 1893, Stromberg, 
lige 1508, GLEN ELiyN.: June) 18219)" W. 
fen Getlands: tes se EMG Ge One 
Eurychilopterella Reuter 
KE Ye LO sSPECLES 
Dorsum of body fuscous to black on a pale 
back erouticians ae oes luridula, p. 73 
Dorsum of body uniformly fuscous brown 
brunneata, p. 74 
Eurychilopterella luridula Reuter 
ik eon luridula Reuter (1909,° p. 
60). 
Mave.—Fig. 108. Length 4.50, width 
1.80; fuscous to black on a pale background; 
pronotum coarsely punctured; dorsum 
clothed with stiff, erect pubescence. 
FEMALE.—Length 4.40, width 1.03; more 
robust than male, but very similar in colora- 
tion. 
Hasits.—Occurs on apple (Pyrus malus ) 
and elm (Ulmus sp.) ; evidently predacious 
in habits. 
