September, 1941 
prominent black spots around the base of 
each. 
FEMALE.—Length 3.10, width 1.33; slight- 
ly more robust than male, but very similar 
in coloration. 
Foop PLants.—Dogwoods (Cornus amo- 
mum and C. stricta). 
KNown DIstrIBUTION—Illinois, Massa- 
chusetts, New York, Virginia. 
Illinois Records.—FrRANKForT: June 8, 
1933, Mohr & Townsend, 14, 19. Sr. 
JosEPH: June 17, 1932, T. H. Frison, 1 ¢. 
URBANA: June 20, 1932, T. H. Frison, 4 ¢, 
so. 
Plagiognathus laricicola Knight 
Plagiognathus laricicola Knight (1923d, p. 
D2). 
This species is black, with fuscous legs; 
small black spots show through the obscura- 
tion on the legs; the body is clothed with yel- 
lowish and dusky pubescence. 
Mate.—Length 3.90, width 1.40. Head 
width 0.66, vertex 0.33. Rostrum reaching to 
middle of hind coxae. Antennae, first seg- 
ment, length 0.27; second, 1.03, fusco-brown- 
ish with black at base; third, 0.66; fourth, 
0.36. Pronotum, length 0.55, width at base 
1.11. Body fuscous black; base of cuneus 
scarcely paler than corium. Legs dark fus- 
cous; small black dots visible on anterior 
and posterior faces of femora; tibiae fuscous, 
but black setigerous spots showing through 
infuscation. 
FEMALE.—Length 3.60, width 1.55; more 
ovate and robust than male, but very similar 
in coloration. 
Foop Prant.—Larch (Larix laricina). 
Known DistriputTion. — Canada, IIli- 
nois, Maine, Minnesota, New York. 
Illinois Records.—AntiocH: July 5-7, 
een Larix, Frison ef al., 444, 789. 
Granp Detour: July 2, 1932, Dozier & 
Mohr, 1¢. 
Plagiognathus punctatipes Knight 
Plagiognathus punctatipes Knight (1923d, 
p. 450). 
This species is black, with the second 
antennal segment black at base, pale beyond; 
the legs are yellowish, and the hind femora 
have two rows of black spots on each anter- 
ior face. 
Matre.—Length 3.80, width 1.70. Head 
width 0.72, vertex 0.37. Rostrum reaching 
KNIGHT: PLANT Bucs, or Miripaz, oF ILLINOIS 39 
middle of hind coxae. Antennae, first seg- 
ment, length 0.25; second, 0.97; third, 0.66; 
fourth, 0.39. Pronotum, length 0.67, width 
at base 1.28. Body black, moderately shin- 
ing, clothed with pale yellowish pubescence ; 
cuneus uniformly black, scarcely translucent 
at base. Legs pale yellowish to fulvous; hind 
femora with two rows of prominent black 
spots on anterior faces; tibial spines with 
rather small black spots around bases. 
FEMALE.—Length 3.70, width 1.70; slight- 
ly more robust than male, but very similar 
in coloration. 
Foop PLant. — Black walnut (Juglans 
nigra). A single Illinois specimen was taken 
on apple. 
Known DistrispuTion.—lIllinois, Michi- 
gan, New York, Ohio, Ontario, Pennsyl- 
vania. 
Illinois Records.—Twenty-six males and 
28 females, taken May 27 to July 6, are from 
Elizabethtown, Freeport, Galena, Hardin, 
Kampsville, Keithsburg, Urbana, Warsaw, 
White Heath, White Pines Forest State 
Parks Zion. 
Plagiognathus dispar Knight 
Plagiognathus punctatipes var. dispar Knight 
(1923d, p. 451). 
This species is smaller and more slender 
than punctatipes Knight; the two are very 
similar in coloration, but dispar has a nar- 
row, pale area ‘at base of cuneus. This 
species was originally described as a variety 
of punctatipes Knight, but more recent ex- 
amination of the genital characters reveals 
a distinct difference in structure of the left 
genital clasper. 
Mace.—Length 3.50, width 1.28. Head 
width 0.67, vertex 0.31. Rostrum reaching 
middle of hind coxae. Antennae, first seg- 
ment, length 0.22; second, 0.90, yellow with 
narrow black area at base; third, 0.58; 
fourth, 0.36. Pronotum, length 0.53, width 
at base 1.06. Body black, moderately shin- 
ing; base of cuneus yellowish, translucent. 
Legs straw colored to yellow; hind femora 
with two rows of fuscous spots on anterior 
face and a group of five or six spots on pos- 
terior surface near apex; tibiae with very 
small fuscous spots around base of spines. 
FEMALE.—Length 3.30, width 1.39; slight- 
ly more robust than male but very similar 
in coloration. 
The cuneus varies considerably in color; 
specimens in which it tends to be entirely, 
