September, 1941 
Host PLrants.—Breeds on Acer spicatum 
and Viburnum acerifolium. 
Known DistrispuTion.—lllinois, Maine, 
Minnesota, New York, Ontario, Pennsyl- 
vania, Wisconsin. 
Illinois Record—Dorson: July 18, 
1934, Rocky Branch, DeLong & Ross, 19. 
Neolygus clavigenitalis Knight 
Lygus (Neolygus) 
(19174, p. 632). 
Known from Connecticut, Maine, Mary- 
land, Massachusetts, Ohio, but not yet col- 
lected in Illinois. Has been collected on 
smooth alder (Alnus rugosa). 
clavigenitalis Knight 
Neolygus semivittatus Knight 
Lygus (Neolygus) semivittatus Knight (19174, 
p. 626). 
Not yet taken in Illinois, but it should be 
found here eventually. Known from Ala- 
bama, Florida, Minnesota, Mississippi, New 
York, Pennsylvania, Texas, Virginia; feeds 
on white oak (Quercus alba). 
Neolygus omnivagus Knight 
Lygus (Neolygus) omnivagus Knight (19174, 
6. 627). 
Mave.—Leneth 5.40, width 2.20. Yellow- 
ish brown with apex of corium dark brown 
to fuscous; clavus dark brown or black; 
very much resembling forms of sezivittatus 
Knight and qguercalbae Knight; also similar 
in color to caryae subfuscus Knight, but 
genital claspers distinctive, fig. 164. 
FEMALE.—Length 5.40, width 2.50. Usu- 
ally paler than male, more yellowish brown; 
never reddish, as in quercalbae, nor with 
fuscous marks on pronotum as in semivit- 
tatus or caryae subfuscus; very similar to 
canadensis Knight, but that species has apical 
one-third of second antennal segment dis- 
tinctly black, fuscous spot on apex of the cor- 
ium smaller and embolium entirely without 
fuscous. 
Foop PrLants.—White oak (Quercus 
alba), red oak (Q. rubra), scarlet oak (Q. 
coccinea) and probably other oaks; breeds 
occasionally on dogwood (Cornus sp.), 
chestnut (Castanea sp.) and arrow-wood 
(Viburnum sp.). 
Known DistriBUTION.—Connecticut, 
Illinois, Iowa, Massachusetts, Michigan, 
Minnesota, New Hampshire, New York, 
KniIcHT: PLANT Bucs, or MirIpDAE, oF ILLINOIS 
163 
North Carolina, Ontario, Pennsylvania, 
Quebec, Rhode Island, Vermont, Virginia, 
Wisconsin. 
Illinois Records.—Eleven males and 25 
females, taken June 4 to July 31, are from 
Dolson, Galena, Glen Ellyn, Grand Detour, 
Keithsburg, Lilly, Marshall, McHenry, 
Monticello, Mount Carroll, Oregon, Rock- 
ford, St. Anne, Savanna, White Pines For- 
est State Park, Willow Springs. 
Neolygus hirticulus (Van Duzee) 
Lygus tenellus Van Duzee (1912, p. 484), not 
Hahn. 
Lygus hirticulus Van Duzee (1916a, p. 41). 
Mave.—Length 4.80, width 2.28. General 
color dark ferrugino-testaceous, sometimes 
entirely dark fuscous or black, except for 
the legs and antennae; genital claspers dis- 
tinctive, fig. 164. 
FEMALE.—Length 5.30, width 2.30. Slight- 
ly larger and more robust than male. Uni- 
formly colored with yellowish brown or, 
in some cases, dark brown; hemelytra rarely 
much darker than pronotum; easily confused 
with fagi Knight, but membrane is_ uni- 
formly and faintly tinged with fuliginous 
color, never dark as in fagi. 
Foop PLants.—Chestnut (Castanea sp.), 
sugar maple (Acer saccharum), beech 
(Fagus sp.), ash (Fraxinus sp.), cottonwood 
(Populus deltoides) and woodbine (Psedera 
Soe 
Known DistripuTion.—Connecticut, 
Illinois, Iowa, Maryland, Massachusetts, 
Minnesota, New Hampshire, New Jersey, 
New York, North Carolina, Ohio, Ontario, 
Pennsylvania, Rhode Island, Vermont. AI- 
ways rare. 
Illinois Records.—ILuinois: 1 2; July 
OR IO92.51-O- me ulyelOgtoOo2. els. el UBOIS: 
June 3, 1919, 1 ¢. FRANKForT: June 8, 
1933, on Fraxinus sp., Mohr & Townsend, 
3 4. URBANA: June 30, 1889, woods above 
lake, 1 4 July 20, 1917, cottonwoods, I 4; 
July 27, 1917, cottonwood grove, 19°. 
WILLow Sprincs: July 8, 1906, W. J. Ger- 
hard, 1 9, FM. 
Neolygus geminus new species 
This is closely allied to hirticulus (Van 
Duzee), as individuals of the two species are 
similar in size and coloration, but the males 
are readily distinguished by the structure 
of the genital claspers, fig. 164. 
