September, 1941 
0.64, width at base 1.22. General color uni- 
formly pale green, translucent. Legs pale; 
slender line on dorsal margin of femora, line 
on apical half of postero-ventral margin of 
hind femora, and a single dot on anterior 
face, black. 
FEMALE.—Length 4.30, width 1.66; simi- 
lar to male in coloration. 
Foop PLant.—Bur oak (Quercus macro- 
carpa). 
Known DIstriBUTION.—Connecticut 
westward to Minnesota and southward to 
Texas, its distribution nearly coinciding 
with the range of its host tree. 
Illinois Records. — Dusois: May 15, 
Pome! Oo Vay. 2201917, 44. 19; 
May 23, 1917, 1¢. FRANKForT: June 8, 
1933, Mohr & ‘Townsend, 19. MownrtTI- 
CELLO: June 11, 1934, Frison & DeLong, 
19. Wuite Pines Forest STATE Park: 
on Quercus sp., Dozier & Mohr, 29. 
Plagiognathus albifacies Knight 
Plagiognathus albifacies Knight (19274, p 
un Be 
This species is allied to blatchleyi Reuter, 
but is distinguished by its pale first antennal 
segment, black sternum, longer head and 
differently formed male genital claspers. 
Mare.—Length 4.40, width 1.50. Head 
width 0.81, vertex 0.35. Rostrum just reach- 
ing posterior margins of hind coxae. Anten- 
nae, first segment, length 0.39; second, 1.55; 
third, 1.14; fourth, 0.58. Pronotum, length 
0.74, width at base 1.28. Hemelytra pale 
yellow, inner half of clavus and apical half 
of corium dusky to pale fuscous; cuneus pale 
to dusky, translucent. Legs pale, femora 
with two rows of black spots on anterior 
face, hind femora with antero-dorsal row 
composed of six larger black spots. Genital 
claspers distinctive, the left clasper with 
lateral or basal lobe much larger than in 
blatchleyt. 
FEMALE.—Length 4.70, width 1.68. Very 
similar to male in coloration and pubescence. 
Foop PLant.—Leafcup (Polymnia cana- 
densis). 
Known  DyIstTrIBUTION. 
ana, Maryland. 
Illinois Records.—ALprIDGE: 
1932, H. L. Dozier, 1¢9.. BLoomINcTon: 
Smiveeiaemlo52. ls Hi Krison, 74; 1-9. 
DANVILLE: Aug. 17, 1934, DeLong & Ross, 
292. Gotconpa: July 25, 1930, on Polym- 
nia canadensis, Knight & Ross, 48 @, 689. 
Indi- 
Illinois, 
May 8, 
KNIGHT: PLANT Bucs, or MiripAk, oF ILLINOIS 35 
Harpin: June 5-9, 1932, H. L. Dozier, 
11g,139Q. Karnak: June 23, 1932, Ross, 
Dozier & Park, 19. Urpana: 1930, on 
Polymnia sp., T. H. Frison, 24, 69 ; Aug. 
Oe), IB Bho Aah. hetrane, ey. hee 
Plagiognathus atricornis Knight 
Oe as atricornis Knight (19264, 
p. 9). 
This species is distinguished by its pale 
color, pale pubescence and black antennae. 
Mace.—Length 3.50, width 1.20. Head 
width 0.77, vertex 0.27. Eyes prominent, 
black. Rostrum just attaining posterior 
margins of middle coxae. Antennae uni- 
formly black; first segment, length 0.24; 
second, 1.07; third, 0.66; fourth, 0.34. Pro- 
notum, length 0.54, width at base 1.03. 
General color pale greenish testaceous, pro- 
notum distinctly green, calli yellowish; hem- 
elytra somewhat translucent, membrane and 
veins uniformly pale fumate. Legs pale, 
hind femora with a double row of prominent 
black spots; knees, tibial spines, and large 
spots at base of spines, black. 
FEMALE.—Length 3.40, width 1.34. Form 
and coloration similar to those of male. 
Host PLant.—Specimens were taken in 
Illinois on red birch (Betula nigra). 
Known DistriputTion.—Previously 
known only from Pennsylvania. 
Illinois Record.—H arrispurc: June 25, 
1932, on Betula nigra, Ross, Dozier & Park, 
Jue AYE 
Plagiognathus blatchleyi Reuter 
ee oaag blatchleyi Reuter (1912a, p. 
61). 
Mave.—Length 4.60, width 1.70; pale 
greenish and yellowish brown; clothed with 
pale yellowish pubescence, hairs becoming 
dusky on cuneus and apical half of corium 
and embolium. Antennae black, third and 
fourth segments pale fuscous, extreme apex 
of first and second segments pale. Tylus 
black. Basal and apical segments of ros- 
trum almost black. Legs nearly as in chrys- 
anthemi (Wolff) but black spots on femora 
less conspicuous. Membrane fuscous, cen- 
tral area of apical half, veins and area in- 
vading each side, paler. 
FEMALE.—Length 4.40, width 1.70; very 
similar to male in coloration, although mem- 
brane, and sometimes antennae, slightly 
paler. 
