26 [April, 1844. 



Descriptions of New Species of Coleoptera of the United States. 



By F. E. Melsueimeu, of Dover, York County, Pennsylvania.* 



HYDRADEPHAGA. 



Leionotus, Kirby. 



L. compar. Olive-black ; lateral margins of the thorax and elytra, testaceous; 

 beneath glossy black. — 12 lines long, 6 lines wide. Pennsylvania and Massa- 

 chusetts. 



Leioxotus compar, Harris MS. 



Body oblong-oval, olive-black, very minutely and sparsely punctuied: head, 

 ■vertex wi'h a faint rufous spot: clypeus testaceous, with the anterior margin 

 dusky, or black : palpi and labrum testaceous, the latter sometimes black : 

 antennas piccous: thorax, lateral margins broadly testaceous; anterior and pos- 

 terior margins most frequently piceous, or testaceous; dorsal line obscure, ab- 

 breviated before and behind, bounded at each end by an impressed puncture : 

 elytra with three fine stria of punctures ; lateral margins testaceous, dusky from 

 the middle to the apex : posterior feet and body beneath glossy black, or dark 

 reddish-brown : pleurae and epipleurx, coxae, and femora of the intermediate 

 and anterior feet, testaceous. 



Thehmojtectus, Eschscholtz. 



1. T. irroratus. Testaceous ; elytra irrorated with testaceous ; clypeus, lateral 

 margins of the thorax and a transverse band on the middle and sides of the 

 elytra, testaceous; beneath dusky rufous, 6 1. long, 3| wide. Pennsylvania. 



Dytiscus irroratus, Melsh. Catal. fOpo 



Acilius ornaticoHis, Aube Spec. p. 140? 



Body oblong-oval, flat, testaceous: head, with the base and a transverse 

 band black, sometimes confluent: eyes black: thorax with two transverse 

 black bands, neither of which attains the lateral margin, anterior band linear 

 and almost united with the posterior one by an abrupt flexure of its ends, pos- 

 terior band broad and emarginate in the middle, and narrow and acute at the 

 ends; dorsal line faintly impressed: scutel black, glabrous: elytra blackish at 

 the basal and sutural edges ; densely irrorate with dark brown, clear at the late- 

 ral margins; a black, undulated and somewhat indistinct fascia behind the mid- 

 dle; a subsutural series of remote impressed punctures: beneath and feet dusky 

 rufous: £ ^^ith an aciculated patch behind the base of each elytrum. 



Though this species does not altogether correspond with Aube's description 

 of ornaticoHis, it may nevertheless prove to be the same species. 



2« T. nimbatus. Black; clypeus, lateral margins and fascia of the thorax, 

 sides and a fascia of the elytra, testaceous; beneath pitchy dusky reddish- 

 brown. — 4-jf 1. long, 2A 1. wide. Pennsylvania. 



Dytiscus nimbatus, Melsh. Catal. 



Body ovate, flattish, black, glossy : head testaceous, base, eyes, and an an- 

 gulated line between the eyes, black : palpi testaceous : antenna: pitchy-rufous : 



* Communicated by the Entomological Society of Pennsylvania. 



