286 G. H. HORN, M D. 



A single specimen from Missouri in the cabinet of Dr. Leconte. It 

 may easily be distinguished from any of our species by the characters 

 given in the table. 



At. oblongus, n. sp. — Oblong, parallel, black, n>oderateIy shining. Head 

 densely punctured. Thorax one third broader than long, convex, coarsely 

 punctured, rather sparsely on the disc more dense and sub-confluent at the 

 sides near the hind angles ; sides feebly rounded, very slightly convergent be- 

 hind, base broadly rounded, hind angles obtuse. Elytra one half longer than 

 wide, catenulato-striatc, intervals convex, punctured at apex, the inner three 

 on each elytron entire. Metasternum and abdomen, the latter especially, 

 coarsely punctured. Legs tjaek, femora coarsely punctured, tarsi piceous. 

 Length ,24 inch ; 6 mm. 



This species is especially remarkable for the very coarse punc- 

 tuation of the abdomen. 



One specimen in the cabinet of Dr. Leconte from California, without 

 more specific designation of locality. 



At. gracilis, Mels. {Oxyomus) Proc. Acad. 1844, p. 137; Lee. (Eupciria) List. 

 p. 36; Harold [Atcenius) Catal. p. 1066. 



This species is so widely diffused and so well known that is appears 

 to me unnecessary to add anything to the characters given in the table. 

 The surface of the thorax in the large majority of specimens is rather 

 densely punctured, the punctures being of neai'ly equal size and very 

 evenly distributed, on the sides scacely more dense than on the disc. 



It may readily be known by its slender form from all the species 

 with a similarly formed cly pens. Length .12 — .16 inch; 3 — t mm. 



This species occurs on the entire American Continent wherever 

 Ajjhuc/iini occur. 



A. ovatulus, (Harold, MSS.) — Black, shining, elongate oval. H^iad moder- 

 ately convex, punctured, more densely and coarsely on the occiput and sides. 

 Thorax convex sides feebly rounded and sligiitly narrower behind, one half 

 broader than long, base broadly rounded, surface unequally punctured, disc 

 sparsely, sides and base more coarsely and densely. Elytra sub-oval, convex, 

 deeply striate intervals convex and not punctured. Metasternum and abdo- 

 men moderately punctured. Legs rufo-piceous. Length .14 inch ; 3.5 mm. 



A very distinct species by the characters enumerated briefly above. 

 The name under which it was sent us by Salle is preserved. 

 Occurs from Pennsylvania to Louisiana. 



~ At. stercorator, Fab. (^pAo'iiiw) Spec. Ins. I, p. 22;Syst. Eleut. I, p. 81; 

 Oliv. Ent. I, 3, p. 89, tab. 17, fig. 15 j ; Harold, (Atoenius) Cat. p. 1067 : cognaia, 

 Lee. {Euparia) Proc. Acad. 1858, p. 65. strigatus, Say, {Aphodius) Journ. Acad. 

 1848, p. 106. 



This species is also one of those having a wide distribution. It oc- 

 curs in all parts of our fauna and extends through Mexico and the 



