188 FAMILY V. — PENTATOMID^E. 



and August, and hibernating in dead leaves and grass in Jan- 

 uary. In Illinois, Hart (1919, 198) says: "It seems to occur 

 only in sandy areas. In the Illinois Valley sand region we have 

 found it common on the low sumac of the sands associated with 

 the larvae of Blepharida rhois L. (the sumac beetle), on which 

 it was probably feeding." 



This species is very closely allied to /'. bioculatus, the arrange- 

 ment of the dark and pale colors above being very similar. 

 Zimmer (1911, 17) says that in a large series from all parts 

 of the country there are numerous intermediates between two 

 extremes, and that "I am inclined to believe that the two so- 

 considered species are but two extremes of an exceedingly 

 variable form." In the specimens at hand the difference in the 

 sculpture of the head, pronotum and abdomen and in the color 

 of the under surface,- as well as the less declivent and longer 

 pronotum of circumcinctus lead me to keep them as distinct. 

 Large series of both forms might, however, cause a change of 

 opinion. 



132 (218). Perillus exaptus (Say), 1825, 313; II, 240. 



Elongate-oval, convex. Color extremely variable, the specimens at 

 hand having the head red, black at base; antennae fuscous-black, with 

 incisures pale; pronotum pale red with a median black bar on front 

 portion; scutellum black with a broad yellow margin except at base; 

 elytra black, embolium ivory-white; connexivum black, margined with 

 red; prothoracic pleurites and abdomen red, the sixth ventral with a 

 median basal black spot; meso- and metapleura black; femora red, tibiae 

 and tarsi fuscous. Head strongly declivent; cheeks coarsely confluently 

 punctate, their margins inflexed. Pronotum rather coarsely and evenly 

 punctate, the black transverse bar almost smooth. Scutellum finely, 

 evenly and sparsely punctate, the margins of basal third coarsely so. 

 Elytra finely evenly and shallowly punctured. Abdomen very finely and 

 sparsely punctate; thoracic pleura more coarsely so. Length, 5 — 7.5 mm.; 

 width, 4.5 — 5 mm. 



Pine, Lake Co., Ind., Oct. 29; Edgebrook and Palos Park, 

 111., July 4 — 15 (Gerhard). Ranges from Quebec and New Eng- 

 land to the Pacific coast, south to New Jersey in the east and 

 New Mexico in the west. Say's types were from Missouri. The 

 upper surface is said to be sometimes almost wholly black, 

 while the pronotum may be ivory-white or the basal half in 

 great part black. The smaller size and the tubercle-like form 

 of the femoral tooth easily separate it from the preceding 

 species. It appears to be scarce at all its definitely recorded 

 stations. 



