September, 1941 
46. 
47. 
48. 
49. 
50. 
DL, 
Median line of scutellum and apical 
half of cuneus blackish........... 
Spat albatus var. vittiscutis, p. 36 
Scutellum uniformly colored, or with 
median line paler than basal angles . 47 
Scutellum with median line blackish, 
darker than lateral areas, which are 
yellowish or light brown.......... 50 
Femora rather uniformly dark except 
at apices, black spots indistinct; 
scutellum uniformly colored, usual- 
ly dark yellowish brown or walnut 
colored, similar to dorsum........ 
Lo gE aan Seni cornicola, p. 38 
Femora pale or light yellowish brown, 
with distinct lines of black spots. . .48 
Length of rostrum less than width of 
pronotum; length of second anten- 
nal segment only slightly greater 
than width of head; length 3.30... 
7 OE Ga ae ae delicatus, p. 37 
Length of rostrum distinctly greater 
than basal width of pronotum; 
length of second antennal segment 
nearly equal to width of head plus 
midtimot vertexslength 4,10 ).4... 49 
Calli and two longitudinal stripes on 
corium black; cuneus black, with 
are Su Alel ets he ete 
....Salicicola var. salicicola, p. 36 
Dorsum uniformly pale, brownish 
markings only very faintly indi- 
CONISGL. tog Ugh a eee a rae ee 
....8alicicola var. depallens, p. 36 
Cuneus uniformly light colored...... 51 
Cuneus brownish or black at apex. . .52 
Rostrum scarcely attaining hind mar- 
gins of middle coxae; propleura 
clothed only with slender pubes- 
cence; femora distinctly spotted 
with black although these dots at 
times are slightly obscured at apex. 
Meet. repletus var. repletus, p. 38 
Rostrum extending beyond middle 
coxae; propleura clothed with silky 
pubescence; femora more or less 
black on apical half, but black areas 
scarcely forming distinct spots... . 
...albonotatus var. compar, p. 31 
. Rostrum attaining hind margins of 
posterior coxae; basal half of cor1um 
and more or less broad area on 
either side of claval suture white; 
paler areas never brownish, darker 
areaswaistinetly black...2%%.4.::%. 
WHO ee similis, p. 37 
KNIGHT: PLANT Bucs, or MiripAgz, oF ILLINOIS 29 
Rostrum not attaining hind margins 
Ou POStctiOnCOMAC ais ain alan suet ese sys 
53. Hemelytra, except along basal half 
of radius, dark brown or yellowish 
brown; most of dorsum dull yellow- 
ish brown to tawny, sides of pro- 
notal disk and median line of scutel- 
lunedark Drown. =.) caryae, p. 38 
Hemelytra black, outer half of clavus, 
basal half of coritum and area ex- 
tending along clava] suture to apex 
palesaticdetranslucen tem meee a) 
cha: repletus var. apicatus, p. 38 
Plagiognathus politus Uhler 
Plagiognathus politus Uhler (1895, p. 52). 
Mave.—Length 3.50, width 1.30; ovate, 
shining black; clothed with simple, pale or 
white pubescence. Femora dark fuscous to 
black, apices pale. Rostrum yellowish at 
middle, apex slightly surpassing hind coxae. 
Antennae black, tip of first segment pale, 
third and fourth pale or tinged only with 
fuscous. Tibiae pale or yellowish, with bases 
darker, and tibial spines with black spots 
surrounding their bases. 
FEMALE.—Length 3.80, 
similar to male but more 
Adults appearing after July, apparently 
of the second brood, are lighter in color, 
usually having the scutellum and mesal areas 
of the pronotum straw colored. They do not 
differ structurally from the typical form 
and belong to the variety flaveolus Knight 
(1923d, p. 434). 
Foop PLANts.—Ragweed (4 mbrosia sp.), 
goldenrod (Solidago sp.) and other herbace- 
ous plants, particularly composits; reared 
from apple (Pyrus malus), where the 
nymphs fed on the tender foliage. In Illi- 
nois, specimens have been taken also on 
hickory (Carya sp.), willow (Salix sp.), 
birch (Betula sp.), cypress (Taxodium 
distichum), oak (Quercus sp.), hazelnut 
(Corylus sp.), red cedar (Juniperus vir- 
giniana), coralberry (Symphoricarpos orbi- 
culatus), locust (Robinia pseudoacacia) and 
pine (Pinus strobus). 
Known DistripuTion.—Commonly dis- 
tributed east of the 100th meridian. 
Illinois Records.—Four hundred forty- 
six males and 505 females, taken June 2 to 
Nov. 1, are from Albion, Algonquin, Aller- 
ton, Alton, Alto Pass, Amboy, Anna, An- 
tioch, Beverly Hills, Bloomington, Bluff 
Springs, Browns, Bureau, Carbondale, 
width 1.60; very 
robust. 
