34 Intinois NATURAL History SuRvEY BULLETIN 
Known DistrinuTion.— Newfoundland 
and the New England states, westward to 
Michigan, Illinois and Minnesota. 
Illinois Record.—ANTIocH: June 10, 
1933, Mohr & Townsend, 2¢, 39. 
Plagiognathus cuneatus Knight 
. Plagiognathus annulatus var. cuneatus Knight 
(1923d, p. 442). 
This form is allied to the typical annulatus 
Uhler, but the cuneus is pale at the base and 
sometimes at the lateral margin; the femora 
are yellowish and spotted with black, but 
the spots do not form black lines. 
Matce.—Length 4.00, width 1.50. Head 
width 0.75, vertex 0.36. Rostrum extending 
to posterior margins of hind coxae. Anten- 
nae black; first segment, 0.30; second, 1.22; 
third, 0.83; fourth, 0.47. Pronotum, length 
0.61, width at base 1.16. General color 
black; cuneus pale to yellowish at base and 
lateral margin; clothed with yellowish to 
golden pubescence. Membrane fuscous. Legs 
pale to yellow; hind femora with two rows 
of small fuscous spots on anterior face, 
sometimes clouded with fuscous. 
FEMALE.—Length 4.20, width 1.70; more 
robust than male but very similar in colora- 
tion. 
Foop PLtant.—Wild aster (Aster sp.). 
Known  DistrisputTion.—Georgia,  IIli- 
nois, New Hampshire, New York, Texas, 
Vermont. 
Illinois Record.—ELIZABETHTOWN: 
May 2723.15 1932 Siieelae Dozier, elec ieg 
Plagiognathus nigritus Knight 
Plagiognathus nigritus Knight (1923d, p. 
441). 
Known only from Colorado, Connecticut, 
Ohio. 
Plagiognathus sericeus (Heidemann) 
Psallus sericeus Heidemann (1892, p. 226). 
Plagiognathus tiliae Knight (1926/, p. 252). 
This species is distinguished by its uni- 
formly pale yellow color and by a few small, 
fuscous points on the anterior face of its 
hind femora. 
Mare—Length 3.30, width 1.34. Head 
width 0.74, vertex 0.31. Antennae uniformly 
yellowish; first segment, length 0.21; second, 
1.08; third, 0.51; fourth, 0.31, Pronotum, 
length 0.57, width at base 1.10. Body uni- 
V ol. Zier eee 
formly pale yellow, the same color as the 
Tilia blossoms among which the insect re- 
treats; indistinct fuscous points on femora 
arranged in a double row, tibial spines pale 
to brownish. Body clothed with soft, recum- 
bent, simple pubescence of pale to golden 
yellow color. 
FEMALE.—Length 3.50, width 1.50. Col- 
oration and pubescence similar to those of 
male. 
Host PLant.—Basswood (Tilia ameri- 
cana); a single specimen was taken on elm 
(Ulmus americana), but may not have been 
feeding on that tree. 
The adult stage is attained just as the 
basswood flowers come into full bloom, and 
the yellow color of the mature bugs matches 
the color of the flowers perfectly. When 
disturbed the bugs hide among the petals 
and are then difficult to see. 
Known DistripuTion.—District of Co- 
lumbia, Illinois, lowa, Minnesota. 
Illinois Records.—ANTI0ocH: July 5-7, 
1932, on Tilia sp., TF. HOE risonseraeece 
39. KAmpsvILLE: June 10, 1932, on Tilia 
sp., H. L. Dozier, 5 ¢, 2° 5 MuUNcIEs =) miy 
22, 1932, Dozier & Parke ite eee ew 
MiForp: July 3, 1936, Ross & Burks, 1 ¢. 
Ursana: July 2, 1914, at light, 19 ; June 
27, 1932, on elm, Frison & Ross, 1 9. Wau- 
KEGAN: July 6, 1932, om edilianspee tee. 
Frison e¢ al. 11 258-08 
Plagiognathus annulatus Uhler 
Plagtognathus annulatus Uhler (1895, p. 51) 
Neither the typical form of this species 
nor the variety nigrofemoratus Knight 
(1923d, p. 443) has yet been taken in IIli- 
nois; known from Colorado, Connecticut 
Massachusetts, Montana, New York. 
Plagiognathus nigrolineatus Knight 
Plagiognathus nigrolineatus Knight (1923d, 
p. 443). 
This is uniformly pale greenish, with pale 
pubescence; it may be distinguished by the 
black lines on the antennae and femora. 
Mave.—Length 4.30, width 1.58. Head 
width 0.75, vertex 0.33. Rostrum reaching 
to middle of hind coxae. Antennae, first 
segment, length 0.28, pale, two longitudinal 
black lines on dorsal surface; second, 1.38, 
pale, a slender black line on anterior surface 
extending from base to near middle; third, 
0.69, pale; fourth, 0.31. Pronotum, length 
