56 Ittinois NATURAL History SURVEY BULLETIN 
fourth, 0.38. Pronotum, length 0.54, width 
at base 0.84. 
Foop PLANT.—In Iowa found breeding on 
an unidentified milkweed (Asclepias sp.). 
Known  DIstrisuTIoNn. — Illinois, Lowa, 
Kansas, Maryland, New Jersey. 
Illinois Records. — Harpin: June 5-9, 
1932, He LL. gDozier 22) 454 1-0 VIENNA: 
May 18, 1932, H. L. Dozier, 3¢. 
Macrolophus tenuicornis Blatchley 
Macrolophus tenuicornis Blatchley (19260, 
p. 913). 
Mave.—Length 4.20, width 0.91. Head 
width 0.47, vertex 0.26; lateral width of an 
eye 0.17, space between eye and pronotal 
collar 0.13. Rostrum reaching to near pos- 
terior margin of hind coxae. Antennae, first 
segment, length 0.56, pale, apex black; sec- 
ond, 1.43, pale, apex black, length greater 
than basal width of pronotum plus width 
of head. Pronotum, length 0.60, width at 
base 0.78. General coloration greenish yel- 
low, darkened with fuscous, nearly as in 
separatus (Uhler), but fuscous points on 
corium much fainter and confined to inner 
half; longitudinal fuscous stripe behind dor- 
sal margin of each eye. 
FEMALE.—Length 4.00, width 1.00. Head 
width 0.43, vertex 0.26. Antennae, first seg- 
ment, length 0.47; second, 1.17. Pronotum, 
length 0.60, width at base 0.82. Very simi- 
lar to male in form and coloration. 
Foop PLANT.—Leafcup (Polymnia cana- 
densis). 
Known DistrispuTiIon.—lIllinois and In- 
diana. 
Illinois Records.—ALGoNQUIN: Aug. 7, 
1930, on Polymnia canadensis, Frison & 
Knight, 1 ¢. FERN Curr: Aug. 3, 1934, 
DeLong & Mohr, 124, 39. Gotconpa: 
July 25, 1930, on Polymnia canadensis, 
Knight & Ross, 528,59. Morris: July 
19, 1883, Webster, 1 @. Ursana: 1930, on 
Rolymniacsp. slatie fh rison wes ee leo 
Hyaliodes Reuter 
KEYS TOs SEE Gili 
1. Collar, calli and areas lateral to calli 
very dark brown or black, median 
pronotal line always light, fig. 98; 
length of first antennal segment of 
male equal to maximum width of 
pronotum; length of first antennal 
Voln22y Ari 
segment of female four-fifths as 
great as maximum width of pro- 
notlm si .4 494.0 eee harti, p. 57 
Entire pronotum almost colorless; 
or pronotum with collar, calli, and a 
broad median mark extending from 
anterior to posterior margins, dark 
brown or black; or pronotum with a 
vague dark mark on median line at 
posterior margin; length of first 
antennal segment in either ex not 
more than three-fourths as great as 
maximum width of pronotum..... 2 
i) 
Broad, median, dark brown or black 
mark extending from anterior to 
posterior margins of pronotum.... 
vitripennis var. discoidalis, p. 56 
Pronotum without broad, median, 
longitudinal, dark marke 3 
3. Length of first antennal segment equal 
to or only slightly greater than 
width of head measured across 
eyes... - =o brevis, p. 58 
Length of first antennal segment much 
greater than width of head across 
eyes; at least two-thirds as great as 
maximum width of pronotum..... 
vitripennis var. vitripennis, p. 56 
Hyaliodes vitripennis (Say) 
Capsus vitripennis Say (1832, p. 24). 
Length 4.80, width 1.70; hemelytra hya- 
line, glassy, with black or red marks border- 
ing scutellum, inner edge of clavus and co- 
rium, and extending across apex of corium 
to lateral margin; also dark on membrane, 
veins and tip of cuneus; pronotum usually 
almost entirely colorless; antennae various- 
ly marked with red. 
In some specimens the median area of the 
posterior portion of the pronotum tends to 
be fuscous; in others it may be dark brown 
or black. Other specimens may have this 
dark mesal area extending the full length 
of the pronotum. These dark extremes con- 
stitute the variety discoidalis Reuter (1909, 
DeOle 
Hasits.—Occurs on several plants; 
frequent on grape (Vitis sp.); predacious 
on plant lice. 
Known DistripuTiIon. — Originally de- 
scribed from Indiana and Pennsylvania and 
since recorded from several eastern states 
and southern Canada. 
Illinois Records.—Forty-eight males and 
95 females, taken May 24 to Sept. 10, are 
