102 
from Elizabethtown, Galesburg, Golconda, 
Grand Detour, Herod, Kansas, Rockford, 
St. Joseph, Savanna, Starved Rock State 
Park, White Heath. 
Orthotylus candidatus Van Duzee 
Orthotylus candidatus Van Duzee (19164, p. 
124). 
Not taken in Illinois; known from Min- 
nesota, New Hampshire, New York; breeds 
on American aspen (Populus tremuloides). 
Male claspers as in fig. 128. 
Orthotylus knighti Van Duzee 
Orthotylus knighti Van Duzee (19164, p. 121). 
Not taken in Illinois; known from Indi- 
ana, New York, Ohio; breeds on American 
aspen (Populus balsamifera) and balm of 
Gilead (P. candicans). Male claspers as in 
fig. 128. 
Orthotylus serus Van Duzee 
Orthotylus serus Van Duzee (1921, p. 131). 
Matce.—Length 5.30, width 1.58. Gen- 
eral color black; median line of pronotal 
disk and scutellum pale; embolium, outer 
margin of corium and cuneus pale greenish, 
translucent; genae, gula, bucculae, rostrum 
except apex, sternum, and legs, greenish 
yellow; membrane and veins uniformly dark 
fuscous. Male genital claspers as in fig. 
128. 
FEMALE.—Length 5.56, width 1.61; very 
similar to male in form and coloration; 
hemelytra with costal margins nearly paral- 
lel; sometimes the pronotal disk, vertex and 
front bordering eyes with broader pale 
mark than in male. 
Hasits.—Breeds on hawthorns (Cratae- 
gus punctata and C. tomentosa). 
KNown  DistriBuTION. — Illinois, Iowa, 
New York. 
Illinois Record.—FRANKForT: June 8, 
1933, on Crataegus tomentosa, Mohr & 
Townsend, 19 4, 329. 
Orthotylus basicornis Knight 
Orthotylus basicornis Knight (1923d, p. 515). 
Mave.—Length 5.60, width 1.66. Ros-. 
trum reaching to middle of intermediate 
coxae. Antennae with first segment black, 
second yellowish to pale fuscous, third pale 
fuscous, fourth fuscous. General color 
Ittinois NATURAL History SURVEY BULLETIN 
Vol. 22; Avia 
green; embolium and outer edge of corium 
yellowish green; membrane pale, veins green. 
Clothed with prominent, suberect, rather 
coarse, pale pubescence. Suggestive of viridis 
Van Duzee, but distinguished by the black, 
first antennal segment and structure of the 
male genital claspers, fig. 128. 
FEMALE.—Length 5.60, width 1.70. Very 
similar to male in form, color and pubes- 
cence. 
Host PLant.— Sandbar willow (Salix 
longifolia). 
Known Distrisution. — Illinois, Indi- 
ana, Iowa, Michigan, Minnesota, New 
York, Quebec, South Dakota. 
Illinois Records.—Thirty-nine males and 
30 females, taken June 9 to Aug. 24, are 
from Antioch, Beardstown, Bureau, Fulton, 
Freeport, Galena, Grand Detour, Kamps- 
ville, Keithsburg, McHenry, Normal, 
Oquawka, Quincy, Savanna, Urbana, 
Warsaw, Waukegan, West Union. 
Orthotylus rossi new species 
This species is allied to basicornis Knight, 
but differs in its shorter second antennal 
segment; the first segment is always paler 
or greenish above; the structure of the male 
genital claspers is distinctive, fig. 128. 
Orthotylus rossi is also allied to the western 
species, fuscicornis Knight, but differs in 
being larger, having a longer first antennal 
segment and short, recumbent pubescence, 
and in details of the genital claspers. 
Mave.—Length 6.10, width 1.80. Head 
width 1.18, vertex 0.43. Rostrum, length 
1.56, extending slightly beyond middle of 
intermediate coxae. Antennae, first segment, 
length 0.56, fuscous to black beneath, yel- 
lowish to green above; second, 1.95, yellow- 
ish green, length less than twice width of 
head; third, 1.08, fuscous; fourth, 0.56, 
fuscous. Pronotum, length 0.99, width at 
base 1.65. Clothed with rather short, re- 
cumbent, pale pubescence. General color 
uniformly yellowish green to clear green; 
eyes, first antennal segment beneath, tip of 
rostrum, and tips of tarsi, blackish; mem- 
brane pale, veins yellowish to greenish. 
Genital claspers distinctive, right clasper 
differs from that of basicornis by having 
a broad, truncated apex. 
FEMALE.—Length 6.30, width 2.16. Head 
width 1.12, vertex 0.56. Antennae, first seg- 
ment, length 0.54, fuscous to blackish be- 
neath; second, 1.86; third, 1.08; fourth, 
