AMERICAN COLEOPTERA. 125 



A. rufiventris, n. sp. — Head rufous, shining. Antennee piceous with 

 the four basal joints paler beneath. Thorax rufous, shining, one-third broader 

 than long and slightly narrowed in front, sides rounded, base more broadly 

 rounded. Elytra bluish-black with slightly glaucous lustre, very sparsely 

 pubescent; entire suture and apex margined with rufous. Body beneath pale 

 rufous, metathorax and tip of abdomen black. Anterior femora beneath, and 

 bases of the other femora testaceous, tibiae and femora piceous. Length .12 — .16 

 inch ; 3 — 4 mm. 



Variety. — Occiput and narrow median thoracic stripe black. 



This species resembles circumscriptus, but may be distinguished at 

 all times by the rufous abdomen. In some specimens the occiput and 

 narrow discal thoracic space are black, increasing by this variation the 

 resemblance between the two. Rarely the sides of the elytra have a 

 very narrow rufous margin, but never extending to base. 



Occurs from Ohio to Texas. 



A. nigripes, Horn, Trans. Am. Ent. Soc. 1870, p. 85. 



The description of this species having been published so recently it 

 is hardly necessary to recapitulate. It is more slender than otfosus, 

 more shining and with entirely black legs. Length .08 — .10 inch; 

 2 — 2.5 mm. 



Occurs in Colorado. 



A. otiOSUS, Say. (Malachius), Am. Ent. (Edit., Lee.) vol. i., p. 109, pi. 48, 

 fig. 3; nigripennis || Say. Journ. Ac. iii., p. 184; nigripennis, Er. (Anthocomus), 

 Entom. 108; Lee. (Attalus), List, p. 53.— Body black, abdominal segments mar- 

 gined* with testaceous. Head black, anteriorly pale yellow. Thorax pale ru- 

 fous, rarely with a narrow median black stripe. Elytra black, sparsely 

 pubescent and feebly shining. Anterior legs and under side of middle femora 

 pale testaceous, middle tibiae and hind legs piceous. Length .12 inch; 3 mm. 

 A rather robust form widely distributed over our Atlantic region. 

 The original name under which it was described might with propriety 

 be restored in the present genus, although some confusion might arise, 

 as it is already so widely known under the name subsecpuently sug- 

 gested by the original describer. 



A. circumscriptus, Say. (Malachius), Journ. Acad, iii., p. 185; Erichs. 

 (Anthocomus), Entom., p. 107; Lee. (Attalus), List, p. 53. — Body black. Head 

 black, labrum pale testaceous. Thorax with large discal black spot, margins 

 pale testaceous. Elytra black, sub-opaque, lateral and apical margins and 

 suture bordered with yellow. Anterior and middle femora pale beneath, above 

 piceous; anterior tibiae testaceous; middle tibiae and hind legs piceous. 

 Length .12 inch ; 3 mm. 



This species appears to be almost entirely conflned to the extreme 

 Southern States. The characters in the table and those above briefly 

 given will distinguish it from any of our species. 



