36 Ittinois NATURAL History SuRVEY BULLETIN 
All but one or two of the Illinois speci- 
mens are darker than the typical form, with 
a brown band developed across the basal 
half of the pronotum and the apical half of 
the clavus. These belong to the variety 
nubilus Knight (1923d, p. 444). 
Foop PLaNnt.—Several specimens were 
taken in Illinois on ragweed (Ambrosia 
sp.). 
Known DistrisuTIon.—District of Co- 
lumbia, Illinois, Maine, Maryland, Massa- 
chusetts, New Jersey, New York, Ohio, 
Virginia. 
Illinois Records.—Nineteen males and 
19 females, taken Aug. 10 to Oct. 6, are 
from Algonquin, Carbondale, Charleston, 
Elizabethtown,” Havana, Jonesboro, 
Mounds, Oakwood, Rockford, Sparland, 
Urbana. 
Plagiognathus salicicola Knight 
Plagiognathus salicicola Knight (19294, p. 
69). 
This species is suggestive of delicatus 
(Uhler) but is easily distinguished by its 
larger size and black markings; the cuneus 
is black with pale margins. 
Mare.—Length 4.10, width 1.50. Head 
width 0.83, vertex 0.33. Rostrum extending 
to middle of hind coxae. Antennae, first 
segment, length 0.27; second, 1.09, pale, base 
and apex black; third, 0.77; fourth, 0.45. 
Pronotum, length 0.65, width at base 1.26. 
Clothed with pale to yellowish simple pubes- 
cence. General color black; anterior margin 
of pronotum, disk behind calli, lower half 
of propleura, scutellum except at base, areas 
along claval suture and radial vein, embo- 
lium, all margins of cuneus, sides of ster- 
num, epimera, and apical area of genital seg- 
ment, pale to yellowish. Legs pale, with two 
rows of spots on femora; apex of inner face 
of femora, knees, spots and spines on tibiae, 
black. 
FEMALE.—Length 3.90, width 1.70; very 
similar to male in pubescence and coloration, 
but with pale areas on dorsum broader. 
The fuscous markings on the dorsum vary 
considerably in intensity and size; the ex- 
tremely light form, in which these markings 
are very indistinct, is referable to the variety 
depallens Knight (19294, p. 70). 
Foop Piant.—Sandbar willow (Salix 
longifolia). 
Known DistriputTion.—Illinois, Indi- 
ana, lowa, Minnesota. 
V al. 22g5k rie 
Illinois Records.—ALTon: July 19-21, 
1932, on Salix sp. Ross & DozierwZice 
ANNA: June 6, 1884,19. Savanna: July 
23, 1892, on sandbar in Mississippi River, 
McElfresh, Hart & Forbes, 59; July 
25, 1892, from sandy island in Mississippi 
River, McElfresh, Hart, Shiga & Forbes, 
1¢,59; July 26, 1892alonomraioaaes 
bottomlands, McElfresh, Hart & Forbes, 
19; July 27, 1892, at light and sugar, Mc- 
Elfresh, Shiga, Forbes & Hartpliemiso.. 
Aug. 1, 1892, from willow, F. M. McEI- 
fresh, 1 ¢@. West UNIoN: June 26, 1932, 
on Salix sp., Ross, Dozier & Parke24- 
Plagiognathus rosicola Knight 
Plagiognathus rosicola Knight (1923d, p. 
446). 
This species is fulvo-testaceous, with the 
antennae, tylus, sternum, and prominent 
spots on the femora, black; the rostrum 
reaches to the middle of the venter. 
Mave.—Length 4.30, width 1.64. Head 
width 0.75, vertex 0.33. Antennae black; 
first segment, length 0.31; second, 1.42; 
third, 1.00; fourth, 0.44. Pronotum, length 
0.66, width at base, 1.22. Color fulvo-testa- 
ceous to fusco-brownish, clothed with yel- 
lowish or golden pubescence; scutellum 
slightly darker than pronotum, disk of cu- 
neus darker. Legs pale yellow and tinged 
with brown, femora with two rows of very 
prominent black spots on anterior face; 
tibiae with large and prominent black spots 
at base of spines. 
FEMALE.—Length 4.40, width 1.70; more 
robust than male, but very similar in colora- 
tion. 
Foop PLant.—Wild rose (Rosa sp.). 
Known DistriBUTION.—lIllinois, Kansas, 
Maryland, Missouri. 
Illinois Record.—Monrticetto: July 19, 
L932 5 er ison. fice 
Plagiognathus albatus (Van Duzee) 
Psallus albatus Van Duzee (1915, p. 116). 
Aputts.—Length 4.20, width 1.40. Gen- 
eral color whitish. Tylus, basal segment of 
antennae, more or less broad area at lateral 
margins of pronotal disk, inner half of 
clavus, subapical spot on corium or, in 
darker specimens, spot covering apical half 
of corium, sternum and venter, black. Calli 
and second antennal segment frequently 
vellowish. Membrane pale, a distinct fus- 
