September, 1941 
cence. Hemelytra pallid, translucent; apex 
of cuneus, apical half of corium and embo- 
lium, and clavus except in central area near 
tip of scutellum, dark brown to black; mem- 
brane pale brown, areoles and veins clear 
to yellowish. Legs black; tips of coxae, bases 
and tips of femora, and tibiae except for 
setigerous spots and spines, pale yellowish. 
FEMALE.—Length 3.80, width 1.62. Head 
width, 0.86, vertex 0.45. Antennae, first seg- 
ment, length 0.22; second, 0.92; third, 0.56; 
fourth, 0.39. Pronotum, length 0.62, width 
at base 1.21. More robust than male and 
usually lighter in color. 
Host PLant.—Willow (Salix sp.). 
Known DistripuTION.—British Colum- 
bia, Colorado, Illinois, Indiana, Iowa, 
Michigan, Newfoundland, New Jersey, 
New York, Ohio, Oregon, Vermont, Wash- 
ington; Europe. 
Illinois Record.—NorrHeErRN ILLINOIS: 
ieee 2D), 
Psallus Fieber 
Toe LCs PE CEES 
1. Second antennal segment with four or 
five black spots, fig. 89; membrane 
with a conspicuous black mark on 
margin behind apex of cuneus; dor- 
sum thickly covered with pale fus- 
Beles Os, . os. Fn seriatus, p. 45 
Second antennal segment either black, 
or pale without distinct black spots. 2 
i) 
Second antennal segment yellowish, 
black only at base. ..amorphae, p. 44 
Second antennal segment black...... 3 
3. Dorsum chiefly red; head, pronotal 
disk and scutellum flecked with 
fuscous; cuneus red with a narrow 
area at base light; length 3.60..... 
Doe alnicola, p. 44 
Dorsum black o- fuscous, never dis- 
Peet ivmetcC KC, 4 mona Be oe & 4 
4. Femora pale or fulvous, or pale with 
black spots, but without black line 
Rm OCSAIMNATOIN eo) Slavs Shoes ©: 5 
Femora black, or pale to yellowish 
with spots and a dark line on dorsal 
RETR eo ee ae 6 
5. Femora uniformly pale or yellowish; 
dorsum uniformly black; length 
NN ET ae a ee strobicola, p. 45 
Femora fulvous, becoming dusky, with 
one or two black dots on dorsal 
KNIGHT: PLANT Bucs, or MiripAgz, or ILLINOIS 43 
aspect near apex, hind femora ob- 
scured with fuscous; length 2.60- 
S DOSE MNEs Oe GS ae bakeri, p. 45 
6. Length of second antennal segment 
more than three-fourths width of 
pronotuimag@basem sey sy 
Length of second antennal segment 
less than three-fourths width of 
Pronetuincas bascweent. one It 
7. Scutellum more or less pale at lateral 
margins, rarely entirely black; if 
scutellum black, cuneus paler or 
dusky at apex only; cuneus usually 
pale, sometimes slightly infuscated 
at apex; pale areas of legs and 
hemelytra_ tinged with reddish 
Vellowen ws eee alnicenatus, p. 44 
Scutellum black; cuneus always partly 
black, frequently paler at base; pale 
areas of legs and hemelytra never 
tinged with reddish yellow........ 8 
8. Rostrum reaching hind margins of 
posterior coxae; hemelytra uniform- 
ly black; femora black with pale 
a DiCeS Cn G Liles OUM a tee earns ame 
Fhe eo Sere morrisoni, p. 45 
Rostrum scarcely surpassing hind 
Mareinsronmicolercoxacs: wae wn D 
9. Femora pale, a dark line forming on 
dorsal margin, anterior face with 
black spots and occasionally be- 
coming uniformly dusky; tip of 
embolium and spot on base of cor- 
ium almost colorless; length 4.50. . 
aN hart ag en ee een parshleyi, p. 44 
Femora black but with light-colored 
A DICEShpe ng. as Mane” ookece nar teed at yee 10 
10. Length 2.90-3.10; deep black, with 
scalelike, silvery white pubescence. 
MEA arte te eee astericola, p. 45 
Length 3.50-4.00; very dark brown, 
hemelytra sparsely clothed with 
silvery, silky hairs intermixed with 
more erect, yellowish pubescence. . 
eek. yee ee eee fuscatus, p. 44 
11. Antennae entirely pale, pubescence 
dusky; legs black; apices of femora 
and tibiae pale, spines with small 
fUSCOUS spotsat Naseer ame. tke 
re ara tee piceicola, p. 44 
Antennae black, or at least first seg- 
mien tebla chk ayers tats fw Pale es: 12 
12. Legs dull yellow brown to dark brown; 
femora sometimes nearly black but 
never paler at apices, always tinged 
with brownish and reddish, hind 
