288 G. H. HORN, M. D. 



Tliis species is very easily known by its color smooth elytral inter- 

 spaces without pubescence. 



Occui's in Georgia and Louisiana. I preserve the name under which 

 it has been distributed by Chevrolat and which appears to have been 

 adopted by Harold. 



At. puncticoUis, Leo. (^MpaWa) Proc. Acad. 1858, p. 66; Harold (Aicenius) 

 Catal. p. 1067, — Oblong, ferruginous, feebly shining. Head sparsely punctured 

 anteriorly sub-rugose. Thorax one fourth broader than long, sides feebly 

 rounded and very slightly narrower behind; surface rather densely punctured, 

 punctures nearly equal in size and very evenly distributed. Elytra subparallel 

 moderately striate, striae impunctured intervals nearly flat biseriately punc- 

 tured. Body beneath rather darker and sparsely punctured. Length .16 inch ; 

 4 mm. 



The length given by Leconte " .4 inch" is an accidental error 

 meaning evidently mm. 



One specimen from El Paso, Texas. 



At. hirsutus, n. sp. — Oblong, ferruginous brown, subparallel, feebly shining. 

 Head moderately convex, sparsely punctured, rugulose anteriorly. Thorax 

 one third broader than long, convex sparsely punctured with coarse and fine 

 ])uuctures intermixed; sides^moderately, base broadly rounded Elytra nearly 

 twice as long as wide, sides feebly rounded, deeply striate and with coarse 

 punctures; interspaces convex, finely biseriately punctulate each puncture 

 with a short yellowish erect hair. Body beneath sparsely punctured, legs 

 paler. Length .16 — .18 inch; 4 — 4.5 mm. 



The punctuation of the thorax in this species resembles that of 

 stercorator but the coarser punctures are larger and more evenly dif- 

 fused over the surface. The base of thorax is more rounded than 

 usual in the other species but less so than in lohatus. Its color seems 

 hardly to warrant its being placed in association with the two preced- 

 ing species but the characters above given will enable it to be readily 

 known whether placed near lohatus or in its present position. 

 Two dead and mutilated specimens from Camp Grant, Arizona. 

 The species which follow are known from all the others in our 

 fauna by the form of the clypeus which is deeply emarginate, sub- 

 angulate on each side of the emargination and usually with a small 

 tooth at the angulation formed by the upturned edge of the cly- 

 peus and at times scarcely seen except by a view in front. 



At. lucanus, n. sp. — Oblong, dark brown, shining. Heail moderately convex 

 sparsely punctured, anteriorly scarcely rugulose. Thorax muderutely convex, 

 sides feebly rounded and slightly narrower in front; surface coarsely but not 

 densely punctured, punctures somewhat finer anteriorly and very evenly dis- 

 posed. Elytra oblong oval, one third lonuer than wide, wider behind the mid- 

 dle. Surface deeply striate, strise at botiom impunctured ; intervals very con-. 

 vex and on ea ch side below the apex a row of moderately coarse punctures 



