134 
opaque, with short pubescence; width of 
collar greater than width of head. Head 
width 1.36, vertex 0.81. Width of collar 
1.40. Rostrum, length 2.40, attaining tips 
of middle coxae. Antennae, first segment 
length 1.07; second, 3.00, nearly cylindrical, 
length of hairs not equal to thickness of 
segment; third, 1.98; fourth, 0.94. Prono- 
tum, length 1.73, width at base 2.77 
FremMace.—Length 8.70, width 3.50; very 
similar to male in form and coloration. 
The single male from Palos Park, listed 
below, which is smaller in size and has the 
width of the head greater than the width of 
the collar, belongs to the variety angusti- 
collis Knight (1923d, p. 556). It may prove 
to be biologically distinct from the typical 
form. 
Known DistrinuTIon.—Connecticut, 
Florida, Illinois, Indiana, Iowa, New Jer- 
sey, New York, Ontario, Pennsylvania. 
Illinois Records.—GaLena: June 27, 
1928, = DreH. ek rison, elesaes) uners051932, 
Dozier & Mohr, 22. GaALzEsspurc: June 
21, -1892,° Stromberg,’ 2 9-;" June’ 27, 1893, 
Stromberg, 29. Harpin: June 5-9, 1932, 
Hes Dozier, 273 Ore LALOScRARKee|iine 
19, 1933, Ross & Mohr, 1 ¢@. Rock IsLaAnp: 
1880, 1 9. WHILLow Sprincs: July 12, 1903, 
W. J. Gerhard, 1 ¢, FM. 
Platytylellus nigroscutellatus Knight 
shoe ESOT IES Knight (1923d, 
>> 
Mare.—Length 9.20, width 3.70. Head 
width 1.71, vertex 0.94; black with gula, 
genae, bucculae, and margins of lora and 
juga, orange yellow. Rostrum black, length 
3.10, extending slightly beyond hind margins 
of middle coxae. Antennae black; first seg- 
ment, length 1.19, clothed with erect, al- 
most pilose hairs, length of hairs not ex- 
ceeding thickness of segment; second, 3.43, 
cylindrical, strongly pubescent, a few erect 
hairs near base as long as thickness of seg- 
ment; third, 1.66; fourth, 0.94. Pronotum, 
length 1.89, width at base 2.94, collar 1.36; 
uniformly orange yellow, finely granulate, 
clothed with short, erect, pale pubescence. 
Scutellum black; sternum blackish; pleura 
orange yellow, becoming fuscous on central 
area of metepisternum. Hemelytra, em- 
boliar margins very slightly arcuate for 
most of their length; black, faintly shining, 
clothed with very fine, short pubescence. 
Legs black; tibiae clothed with erect, prom- 
p. 
Ittinois NaturRAL History SuRvVEY BULLETIN 
Vol. 22; Art 
inent hairs, length of many hairs exceeding 
thickness of segment; spines not evident. 
Venter black, with a velvety luster; clothed 
with erect, fine, dusky pubescence. 
FEMALE.—Length 9.70, width 3.50. Very 
similar to male in form and color. | 
KNown DiIstriBuTION.—lllinois, Michi-- 
gan, New York, North Carolina, Pennsyl- 
vania. 
Illinois Record.—HetryworrtuH: Aug. 14, 
1909, A. B. Wolcott, 1 9, FM. 
Platytylellus fraternus Knight 
Platytylellus fraternus Knight (1923d, p. 
BY 
The color pattern of this form is sugges- 
tive of that of confraternus (Uhler), but 
this is larger, and the length of the first an- 
tennal segment is equal to the width of the 
vertex plus one-half the dorsal width of an 
eye. 
Mave.—Length 9.40, width 3.50. Head 
width 1.56, vertex 0.86; red, with tylus, 
front and vertex chiefly black. Rostrum, 
length 2.85, reaching to middle of hind 
coxae. Antennae, first segment, length 1.06; 
second, 3.23, thickest near base and tap- 
ering to become more slender at apex, 
clothed with short, stiff, black hairs and 
fine pubescence, length of longest hairs not 
exceeding thickness of segment; third, 1.71; 
fourth, 1.28. Pronotum, length 1.74, width 
at base 2.92, collar 1:31; surtacemivers 
slightly shining, thickly clothed with short, 
pale pubescence; red, with dorsal area of 
collar, calli except at outer angles, and a 
broad band extending to basal margin of 
disk, black. Scutellum black; sternum 
blackish, median line red; pleura red or 
becoming dusky. Hemelytra with emboliar 
margins only slightly arcuate; black, opaque, 
surface somewhat scabriculous, clothed with 
))\ AWA 
fl 
\:: y 
AN > \ AS 
Fig. 150.—Male genitalia of Platytylellus 
fraternus. 
