SUBFAMILY I. — ARADIN^. 293 



nexivum broadly exposed, its margins but feebly crenate. Male with 

 fifth and sixth ventrals subequal in length, the membrane reaching 

 apical angles of sixth; female with elytra extending to base of dorsal 

 genital segment, the latter with hind margin slightly emarginate at 

 middle. Length, 7.5— 9 mm. (Fig. 63 and PI. I, fig. 3). 



Occurs throughout Indiana, more frequent in the northern 

 counties, March 11 — Aug. 24. DeBruce and West Point, N. Y. 

 (Davis) . Ranges from Quebec and New England west to 

 Minnesota and Edmonton, Alberta, and south and southwest to 

 Florida and Panama. In Indiana it occurs mainly in crevices of 

 freshly sawed oak and beech stumps and hibernates beneath 

 logs. The only Florida record is that of Bergroth (1892, 335) 

 without definite locality. Easily known by its dark color and 

 peculiar structure and color of antennae. 



Group III. — Aradus. 



This group comprises species of medium size and oval form, 

 having the antennae very stout, the second joint distinctly 

 longer than third; corium strongly dilated at base. To it be- 

 long five of our eastern species. 



KEY TO EASTERN SPECIES OF GROUP III, ARADUS. 



a. Pronotum with three polished black areas behind the middle; head 

 and pronotum dark, strongly contrasting with the pale elytra 

 and abdomen. 218. ORNATUS. 



aa. Pronotum without smooth black areas; color more uniform. 



b. Third antennal segment concolorous or pale at apex only; body 

 brownish; pronotum as long as or longer than head. 

 c. Scutellum subpentagonal, its sides scarcely elevated behind mid- 

 dle; color usually almost uniform brown. 219. robustus. 

 cc. Scutellum triangular, its sides elevated throughout; color usually 

 variegated, sides of pronotum granulated. 

 d. Pronotum widest behind middle, its median carina? nearly paral- 

 lel; first antennal pale. 220. duzeei. 

 dd. Pronotum widest at middle, its median carina? sinuate; first an- 

 tennal concolorous with the others. 221. implanus. 

 bb. Third antennal segment largely yellow; body black; pronotum only 

 two-thirds as long as head ; abdomen almost circular. 



222. CURTICOLLIS. 



218 (365). Aradus ornatus Say, 1832, 29; I, 352. 



Oval, granulate on head and pronotum. Dark brown; elytra and 

 abdomen yellowish-white, tip of clavus dark; basal third of pronotum 

 with polished chocolate-brown spots between the carina?; legs dull yel- 

 low, the femora and tibiae with a broad dark ring near middle. Head a 

 little broader than long, tylus short, slightly tapering; impressions of 



