September, 1941 
cous ray along margin just beyond clear spot 
at tip of cuneus. Hind femora with a group 
of black spots on apical half, sometimes with 
a subdorsal row of spots extending over 
basal half. Tibiae with small and sometimes 
indistinct spots at bases of spines; female 
with pale areas broader than those of male. 
The variety vittiscutis Knight (1923d, 
p. 445) differs from the typical in having 
the apical half of the cuneus black; it has 
not yet been collected in Illinois. It occurs 
on butternut (Juglans cinerea). 
Foop PLant.—Sycamore (Platanus occi- 
dentalis) ; specimens were also taken on 
walnut (Juglans nigra). 
Known DiIstriBsuTION.—Connecticut, 
District of Columbia, Georgia, Illinois, 
Iowa, Massachusetts, Michigan, Minnesota, 
New York, Ohio, Pennsylvania, Quebec. 
Illinois Records.—Forty-seven males and 
49 females, taken June 13 to Aug. 9, are 
from Alton, Ashley, Danville, Dolson, 
Eichorn, Herod, Kansas, Monticello, Oak- 
wood, Putnam, Rockford, Urbana, Vienna. 
Plagiognathus similis Knight 
Plagiognathus albatus var. similis Knight 
(1923d, p. 445). 
The coloration of this form is suggestive 
of albatus (Van Duzee), but it may be dis- 
tinguished by the black base of its second 
antennal segment and the two rows of black 
spots on the hind femora. 
Matce.—Length 3.90, width 1.38. Head 
width 0.78, vertex 0.30. Rostrum extending 
almost to hind margin of posterior coxae. 
Antennae, first segment, length 0.23; second, 
1.08; third, 0.72; fourth, 0.43. Pronotum, 
length 0.62, width at base 1.14. General 
color black, varied with pale; scutellum pale, 
with a rather broad, black, median line; 
hemelytra pale, inner half of clavus, apical 
half of corium and area invading embolium, 
black; cuneus pale, translucent, apical half 
black. Legs pale yellow; hind femora with 
two rows of black spots, anterior pairs with 
three or four spots forming a line; tibial 
spines black with prominent black spot 
around base of each. 
FEMALE.—Length 3.50, width 1.50; very 
similar to male in form and coloration. 
Foop PLant.—Red birch (Betula nigra). 
Taken also on alder (4/nus) in Michigan 
and on birch in Maryland. 
Illinois Records.—E1cHorn: June 24, 
1932, Hicks Branch, on Betula nigra, Ross, 
KNIGHT: PLANT Bucs, or MiripAg, or ILLINOIS 37 
Dozier & Park, 14. “Garena: June 30, 
1932, on Betula nigra, Dozier & Mohr, 
2é¢,39. Harrisspurc: June 25, 1932, on 
Betula nigra, Ross, Dozier & Park, 204, 
249; June 15, 1934, DeLong & Ross, 19. 
Plagiognathus fulvidus Knight 
Plagiognathus fulvidus Knight (1923d, p. 
447), 
Known from Connecticut, Maryland, 
New Jersey, North Carolina, Ohio. 
Plagiognathus delicatus (Uhler) 
Psallus delicatus Uhler (18874, p. 34). 
Aputts.—Length 3.30, width 1.40. Gen- 
eral color reddish yellow to brownish. First 
antennal segment except extreme tip, and a 
ring at base of second segment, dark fus- 
cous; front of head more or less dark either 
side of median line. Hemelytra, sternum 
and abdomen shaded with fuscous, some- 
times basal margins of calli quite dark; 
scutellum yellowish, usually with basal 
angles dark, thus leaving a median pale line; 
membrane lightly shaded with fuscous; 
cuneus with area near middle and spot on 
either side adjacent to apex clear. Legs 
pale yellow to fulvous, with two rows of 
spots on femora; tibial spines and _ spots 
around their bases, and apex of tarsi and 
claws, black: 
Host PLrant.—Honey locust (Gleditsia 
triacanthos). 
Known  Distripution.—lllinois, Indi- 
ana, lowa, Missouri, New York, Ohio, 
Pennsylvania, Virginia. 
Illinois Records.—ELIZABETHTOWN: 
Via va hao 32 ald el zee ozie7 0 se OtOn, 
GranpD Tower: May 12, 1932, Frison, :Ross 
& Mohr, 18 ¢@, 119. Urspana;- June /, 
1916, on tree trunk, 1 9 ; June 9, 1916, on 
tree trunk, 19; June 27, 1917, on tree 
aameres Vf CYS (hers IE ERS Veal Asi kes, aMer: 
Plagiognathus gleditsiae Knight 
Plagiognathus gleditsiae Knight (1929d, 
5. 265). 
This species is allied to delicatus (Uhler), 
but is distinguished by its broader head and 
shorter rostrum; the scutellum is black with 
a median pale line, and the frons has a quad- 
rate black spot on either side of the median 
line. 
Matve.—Length 3.00, width 1.17. Head 
