AMERICAN COLEOPTERA. 285 



Elytra] intervals smooth ovatulus. 



Metathorax smooth. 



Tliorax rounded at base stercorator. 



Thorax broadly lobed at base lobatus. 



Color ferruginous or pale castaneous. 

 Elytra glabrous. 



Elytral interspaces smooth shining socialis. 



Elyiral interspaces punctulato puncticoUis. 



Elytra sparsely hirsute ■ hirsutus. 



Clypeus deeply einargiuate on each side subangalate and donLicuIate. 

 Color black or very dark. 



Sides of thorax gradually rounded. 



Elytra oval convex, intervals sub-costiform Incanus. 



Elytra elongate parallel, intervals moderately convex abditus. 



Sides of thorax distinctly sinuate at base cyliadrus. 



Color ferruginous. Elytra oblong convex desertua. 



At. imbricatus, Mels. (Aphodius) Proc. Acad. lSt4, l.'IG. Lee. (Euparia) List. 

 p. .37. Harold {AfcE7iius) Catal. p. 1068; sordidus, Harold, Col. Hefte, p. V, p. 

 103. — Oblong, parallel, black with brownish or cinerous opaque coatiiig, and 

 very short pubescence. Head convex, rather densely punctured ; clypeus 

 broadly emarginate and rounded on each side; antenniBaud palpi ferruginous. 

 Thorax ncarl}-^ twice as broad as long, sides (when viewed from above) feebly 

 rounded, slightly broader in front, anterior angles rounded, base broadly 

 rounded and without any marginal line; surface sub-rugose and sparsely 

 punctured. Elytra sub-parallel, finely punctato-striate, interstices nearly flat; 

 but more convex at apex. Body beneath with mctasternura and abdomen 

 coarsely punctured. Legs rufo-piceous, tarsi paler. Length 16 — IS inch; 4 — 4.5 

 mm. 



Western and Southern G'ulf States and extending to Mexico, Cubi^ 

 and J>razil. 



A typical specimen sent by Salle enables me to fix the synonymy of 

 Harold's species definitely. 



At. alternatus. Mels. (Oxyomus) Proc. Acad. 1S44, p. 147; Lee. (Euparia) 

 List, p. bl : Harold (Atcenius) Catal. p. 1066.— Similar to the preceding in form 

 but always darker in color and with less surface coating and not pubescent. 

 The strisB are not punctured and the intervals acutely convex and alternately 

 higher especially on the back, those of the sides nearly equal. Metatiiorax 

 and abdomen sparsely punctured. Length .14 — ,18 inch; 3.5 — 4.5 mm. 

 Occurs from Pennsylvania to Florida. 



At. robustus, n. sp. — Oblong of robust facies, black sub-opaque. Head modor 

 ately convex densely punctured. Thorax nearly twice as broad as long, sides 

 feebly rounded and very slightly converging behind basal angles broadly 

 rounded, base broadly rounded, marginal line distinct; surface densely and 

 equally punctured. Elytra one third longer than broad, convex, sides rounded, 

 surface striate and with feeble punctures, intervals flat and densely punctureil. 

 Body beneath shining, metasternun) and abdomen sparsely punctured. Logs 

 piceo-rufous. Length .18 inch; 4.5 mm. 



TU.\NS. AMF.n. EST. SOC. (37) MAV, 1871. 



