198 
Pronotum with a median pale vitta from anterior pale border, dividing ante- 
rior black bar into two transverse marks; costal pattern variable; femoral 
spine finger-like, longer than thick; basal margin of scutellum narrowly 
pale. 
Second antennal black, venter with submarginal row of black spots (female) 
or a large central black patch containing the stridulatory areas (male) ; 
a broad distinct arcuate pale band between the humeri. 
Black, with red markings; elytra black, costal border red towards base.... 
sibpaettarstoha ls latiasnm onaransiereteraletone ele leiocen te. eteh ie ats tei sae me ee are aye tates terete anal bioculatus. 
More or less rufous or brownish, with pale yellowish markings; corium 
with broad pale costal, apical, and inner border, except inner margin, 
which is narrowly black...............c0ceeeuvees bioculatus, var. clauda. 
Second antennal pale, venter with broad submarginal black stripe; pale band 
between humeri absent, obscure, or irregular, costal border of corium pale, 
often a pale streak near inner margin..................+-4-. circumcinctus. 
PERILLUS EXAPTUS Say 
Pentatoma exapta Say, Jour. Acad. Nat. Sci., Phil., Vol. 4, p. 313. 1825. 
Quebec to Vancouver, southward to New Jersey and New Mexico. 
In our collections from northern Illinois and from Urbana, early in the 
season. 
PERILLUS BIOCULATUS Fabr. 
Cimez bioculatus Fabricius, Ent. Syst., sec. ed., Vol. 4, p. 120. 1794. 
This species is listed as ranging from California and Oregon to Iowa. 
The typical form is in our collection from Algonquin (Nason). The 
variety clauda has not been taken in Illinois, as far as I know. The two 
forms appear to be quite constant and distinct, and are perhaps valid 
species. 
PERILLUS CIRCUMCINCTUs Stal 
Perillus circumcinctus Stal, Stett. Ent. Zeit., Vol. 23, p. 89. 1862. 
Eastern United States and Canada, as far west as Manitoba and Mis- 
souri, and perhaps Mexico. Fergus Falls, Minn., July 10 (Zetek). In 
Illinois it seems to occur only in sandy areas. In the [Illinois valley sand- 
region we have found it common on the low sumac (Rhus canadensis 
illinoensis) of the sands, associated with the larvae of Blepharida rhois, 
on which it was probably feeding. Our localities are northern Illinois 
(several specimens) ; the lake beach at Chicago; and Manito, Forest City, 
and Havana in the Illinois valley sands, the dates being April 28, June 6, 
8, and 10. 
3. ANDRALLUS Bergr. 
A fine example of A. spinidens was captured by me at Brownsville, 
Tex., and the genus is therefore included in the key as a member of our 
fauna. The single species inhabits Ethiopian Africa, Madagascar, Asia 
Minor, India, Java, Borneo, Australia, New Caledonia, Fiji, and Tahiti, 
