September, 1941 
4. Length of second antennal segment 
less than width of pronotum at base 5 
Length of second antennal segment 
equal to or greater than width of 
Beopotuimeate bases. sone wn. 5. fi 
5. First antennal segment yellowish, 
fuscous at base only; femora usually 
with fuscous dots on anterior face 
although these at times absent; 
length 3.30.......modestus, p. 41 
First antennal segment black, or 
POSH VEDIC ae. t eh cy 6 
6. Smaller, length 2.60—2.80; rostrum not 
extending beyond hind margins of 
MUCCIEs COXAC Ss 0k aa ass tsugae, p. 42 
Larger, length 3.30; rostrum nearly 
attaining hind margins of posterior 
COxac mer wi oe tumidifrons, p. 42 
7. Rostrum long, extending beyond hind 
coxae, reaching to near middle of 
venter; hind femora uniformly pale 
mellowish.. wu. o. longirostris, p. 42 
Rostrum shorter, reaching only to 
middle of hind coxae; hind femora 
with fuscous spots on anterior face. 
vs Sy eee elongatus, p. 42 
Microphylellus modestus Reuter 
Microphylellus modestus Reuter (19124, p. 
62). 
Aputts.—Length 3.30-3.50, width 1.30. 
Body ligneous black. Antennae and legs yel- 
lowish; first antennal segment fuscous at 
base, dark area sometimes extended from 
base toward middle. Hind femora usually 
with three or four fuscous dots near dorsal 
margin on anterior face, although these spots 
are frequently indistinct. Hemelytra mostly 
black, with membrane fuscous; apex ot 
cuneus slightly paler, and veins pale fuscous. 
Host Prants.—Elm (Ulmus) and white 
oak (Quercus alba). In Illinois, specimens 
have been taken also on hazelnut (Corylus 
americana), hawthorn (Crataegus mollis) 
and hickory (Carya sp.). On elm the bugs 
are found most frequently among leaves 
curled by aphids, where they feed to some 
extent on honeydew. I have observed this 
species feeding on eggs of the elm leaf beetle, 
Galerucella luteola Mullsant. 
Known Distrisution. — From Minne- 
sota to Texas and in all states eastward. 
Illinois Records.—Fifty-one males and 
57 females, taken May 23 to July 6, are 
from Algonquin, Dolson, Elizabethtown, 
Frankfort, Freeport, Galena, Galesburg, 
KNIGHT: PLANT Bucs, or MiripAgz, oF ILLINOIS 41 
Grand Detour, Hardin, Havana, Homer, 
Keithsburg, Maywood, Meredosia, Monti- 
cello, Mounds, Rockford, Rogers, Savanna, 
Ullin, Urbana, Waukegan, White Heath, 
White Pines Forest State Park, Willow 
Springs, Zion. 
Microphylellus nigricornis Knight 
Microphylellus nigricornis Knight (1923d, 
p. 457). 
Not yet collected in Illinois: known to 
occur in Minnesota, New York, Ontario. 
It breeds on aster (Aster macrophyllus). 
Microphylellus maculipennis Knight 
Microphylellus maculipennis Knight (1923d, 
p. 456). 
This is similar in size to modestus Reuter, 
but is distinguished by having pale markings 
on the dorsum. 
Mare.—Length 3.40, width 1.30. Head 
black, width 0.69; vertex pale, 0.33. Ros- 
trum yellowish, dark at base and apex and 
reaching hind margins of middle coxae. An- 
tennae, first segment, length 0.30, yellow, 
fuscous at base; second, 0.86, yellow, fuscous 
at base and dusky at apex; third, 0.47, yel- 
lowish with dusky tinge; fourth, 0.33, pale 
fuscous. Pronotum, length 0.55, width at 
base 1.11; black, moderately shining; cen- 
tral area of disk and basal angles pale to 
yellowish; clothed with fine, yellowish pubes- 
cence. Scutellum pale yellowish; rather 
broad median line of scutellum and mesoscu- 
tum black. Hemelytra mostly black, with 
embolium, cuneus, and basal half of corium, 
usually straw colored to yellow but some- 
times distinctly reddish; membrane fuscous, 
paler bordering apex of cuneus, veins pale 
only at apex of areoles. Legs pale to yel- 
lowish; basal half of hind coxae and tips of 
tarsi fuscous. 
FEMALE.—Length 3.40, width 1.39; slight- 
ly more robust than male but very similar in 
coloration. 
A form of this species having the antennae 
very dark, almost black, rather than light is 
known only from Maine; it has been de- 
scribed as maculipennis fuscicornis Knight 
(1923d, p. 457). 
Foop PLant. — White 
alba). 
Known DistrisutTion. — Illinois, Iowa, 
Maine, Minnesota, Texas. 
Illinois Records.—FRANKForT: June 8, 
oak 
(Quercus 
