6() GEO. H. HORN, M. D. 



base as thorax, the base arcuately emargiiiate, humeri promincutly deutate, dise 

 convex, finely striate, strife with fine not close punctures, intervals flat, smooth. 

 at apex costiform. Mesosternum opaque, coarsely punctate, a smooth elevated 

 line in front, not carinate between the coxae. Metasternuni moderately punc- 

 tate. Abdomen obsoletely coarsely punctate. Posterior femora sparsely punc- 

 tate, the tibia with feeble ridges, the first tarsal joint longer than the next three. 

 Length .22-.24 inch ; 5.5-6 mm. 



No sexual differences have been observed. Differs from either of 

 the other two species by the flat elytral intervals and shining surface. 



Occurs from Canada (Pettit) to Maryland ; also in Massachusetts 

 (Blan chard). 



D. llllcei Horn.— Oblong, broader behind, convex, sericeous opaque. An- 

 tennsp ferruginous. Head coarsely not closely puiictate. Clypeus hemihexag- 

 onal, broadly emarginate in front with an acute reflexed tooth each side, the 

 sides oblique, the gense small, obtuse. Thorax nearly one-half wider than long, 

 not or very slightly narrowed in front, the anterior angles rectangular, sides 

 feebly arcuate, slightly undulating, hind angles well defined, not obtuse; base 

 arcuate at middle, very oblique and sinuate each side, the marginal line distinct ; 

 disc convex, the median line vaguely impressed, surface coarsely and closely 

 punctured, very densely at sides. Elytra a little wider than the base of the tho- 

 rax, the base feebly emarginate, humeri prominently dentiform; disc convex, 

 the striae fine, catenulately punctured, on each side of the stria a very fine carina, 

 the intervals elevated at middle in a fine carina, at the sides the spaces between 

 the carinse are bicatenulate. Mesosternum opaque, .sparsely punctate, with a 

 smooth fine carina in front. Metasternuni coarsely punctate at middle, more 

 finely at the sides. Abdomen sparsely indistinctly punctate. Posterior femora 

 sparsely punctate, the tibia slender, the oblique carinse feeble, the first tarsal 

 joint longer than the next three. Length .24 inch ; 6 mm. 



A very pretty species in its peculiar surface lusti-e and elytral 

 sculpture. 



Occurs at Deer Park, Maryland. 



D. striatulus Say. — Oblong, .slightly broader behind, convex, piceous brown, 

 opaque. Antennse ferruginous. Head moderately coarsely punctate, closely 

 behind and at sides, more sparsely at middle. Clypeus hemihexagonal, feebly 

 emarginate, the angles obtuse, gense very small. Thorax very little wider than 

 long, slightly narrowed in front, anterior angles rectangular, sides nearly straight 

 or very slightly sinuous, hind angles well defined, but obtuse ; base arcuate at 

 middle, very oblique and sinuate each side, basal marginal line absent; disc con- 

 vex, the median line broadly and deeply impressed, not reaching the apex, sur- 

 face coarsely cribrately punctured. Elytra as broad at base as the thorax, base 

 emarginate, the humeri not dentate, but slightly prominent in front; disc con- 

 vex, the intervals elevated in acute carinse, the space between them concave with 

 a row of indistinct coarse punctures. Mesosternum opaque, coarsely rugose. 

 Metasternum coarsely, closely punctate. Abdomen opaque, somewhat rugose, 

 each segment coarsely crenate in front. Posterior femur sparsely punctate, tibife 

 slender, the first tarsal joint as long as the next four. Length 16.-.20 inch ; 4-5 

 mm. 



