AMERICAN COLEOPTERA. 141 



two small tubercles. The species may be at once known by the notched 

 clypeus. 



Occurs from the Middle States to Florida, where it is very abun- 

 dant. 



O. pensylvaniciis Harold, Coleopterologische Hefte VIII., p. 115 ; ovatus % 

 List Col. N. A. : qranarius Zimm., mscpt. — Black, feebly shining, very sparsely 

 pubescent. Clj'peus entire or feebly truncate at middle. Thorax moderately, 

 not densely punctate. Elytra finely striate, intervals biseriately punctate, 

 punctures alternating. Body beneath piceous, shining, sparsely punctate. 

 Length .14 — .20 inch; 3.5 — 5 mm, 



Male. — Front nearly flat without carinse, with very few punctures, clypeus 

 very sparsely punctate. 



Female. — Front sparsely, clypeus rather densely and coarsely punctured. 

 Clypeal carina moderate, feebly elevated. Vertical carina nearly obsolete. 



This s'pecies has been distributed in many cabinets in our country 

 as ovatus Linn., from which it differs greatly. The latter is of larger 

 size, thorax much more coarsely and densely punctured, the clypeal 

 carina $ very feeble and the vertical carina strong and considerably 

 elevated. 



Occurs rather abundantly from the Middle States to Kansas, Texas 

 and Florida. 



0. rhinoceros Mels., Proc. Acad. II., p. 134, is the European 0. 

 nuchicorm's Linn., introduced by accident into Melsheimer's cabinet. 



APHODIIJS, Illig. 



A. arcticus Harold is congregatus Mann. The color of this species 

 is subject to great variation. A. arcticus has entirely black elytra and 

 congregatus yellowish red or ferruginous, slightly or much clouded. 



A. ISteiuheiU Harold is serval Say. 



DIALiYTES, Harold. 

 D, Ulkei, n. sp.— Obovate, black, subopaque. Head shining, coarsely but 

 sparsely punctate, clypeus broadly emarginate at middle with an acute, promi- 

 nent tooth on each side. Thorax sub-cylindrical very slightly narrower in 

 front, sides in front nearly straight, posterior third suddenly narrowing with a 

 feeble sinuation, apex truncate base feebly lobed, disc convex, a feeble median 

 impression near the base, surface coarsely and densely punctured on the disc, 

 at sides confluent, basal marginal line distinct. Elytra slightly broader behind 

 the middle, humeral angles strongly dentiform, disc convex, intervals finely 

 costiform between which are two finer elevated lines which enclose distant 

 punctures, these finer lines near the sides are interrupted. Body beneath sub- 

 opaque sparsely punctured, legs shining more coarsely punctured. Length .24 

 inch; 6 mm. 



Very distinct from either of our species by the denticulate clypeus 

 and the elytral sculpture. 



One specimen collected in Maryland, at Deer Park, by Mr. H. Ulke. 



