THE PEEDACEOT'S PITING BEETLES. 233 



the margins ; elytra with the margin broadly yellow and usually with a 

 sub-basal yellowish band from which extend backward four or five narrow 

 dull yellow lines ; under surface dark piceous, the presternum paler. Length 

 12.5-14 mm. 



Lake and Steuben counties; rare. May 27-August 16. 



455 (1478). Hydaticvs i^evipexni.s Thoms., Op. Ent., Ill, 324. 



Elongate-oval, subconvex. Piceous abuve and beneath ; front of head, 

 thorax except a basal cross-bar, front and middle legs and antennae reddish- 

 yellow ; side margins of elytra dull brownish-yellow ; middle tibiJB piceous. 

 Dorsal rows of punctures distinct. Female with tips of elytra slightly pro- 

 duced and subsinuate. Length 12.5 mm. 



One male in Field ^Museum e(>lleetion from "Ind.," probably 

 St. Joseph County, The dark basal cross-bar of thorax is widest at 

 middle and tapers to a line each side. 



H. hiniarginatus Say. 12 mm. in length, occurs from Ohio to 

 Georgia and Florida. 



XXI. AciLius Leach. 1817. (L., a Roman name.) 



]M cdium-sized subdepressed species, slightly obovate in 

 form, and having the upper surface distinctly and regu- 

 larly punctate ; thorax not ma.rgined ; hind coxas very 

 large. Females with elytra either sulcate or smooth. 

 ]\lalc,s with front tarsi broadly dilated, with one large and 

 two small disks beneath, the middle tarsi simple, the jjg 



hind claws equal (Fig. 118.) Two species have been (^f'^f Co^^t"*-) 

 taken in Indiana, while one other may occur. 



KEY TO INDIA>;A SPECIES OF ACILITS. 



a. Vertex with a distinct M-shaped black mark ; sulci of female elytra un- 

 equal in length, the outer ones longer and reaching nearly to base. 

 h. Hind femora X'eddish-brown; length 12.5-14 mm. 



456. SEJIISULCATUS. 



hb. Hind femora black; length 12 mm. mediatus. 



(Id. Xfvtex without an M-slin[)ed mark; sulci of fcjiiale subequMl in length 

 and reaching only to middle of elytra; length 13-15 nmi. 



457. FRAIERNUS. 



t5i; (141)2). Acu.iis SEMisuLCATUs Aubc, Spec. Gen., 

 VI, 1S3S, ]:'.2. 

 Broadly oval or obovate. Dull brownish-yellow above ; 

 head with base and an :\I-shaped mark on vertex 

 black ; thorax with two transverse black lines on 

 disk, the front one the wider ; elytra closely marked 

 with black dots and with subapical yellowish cross- 

 l«Tr. Length 12.5-14 mm. (Fig. 119.) 



Lake, Jlarshall, Marion and Vigo counties; 

 (After wickhaiu',) fre(|uent. Jujie 12-August ] 5, 



