130 ACADEMY OP NATURAL SCIENCES 



slightly emarginate near the anterior tip ; posterior moiety a little 

 flattened, with an impressed line; posterior tip rounded and hard^ 

 ly extending beyond the base of the postpectus : feet dark pieeous. 



Leno-th from three-fifths to thirteen-twentieths of an inch. 



This species, which is found equally in Pennsylvania and on 

 the Missouri, is certainly very closely allied to the H. carahoides 

 of Fabr. The ' venter as [202] well as the postpectus of this 

 species has a silky appearance in a certain light, occasioned by its 

 minute dense hairs. The posterior termination of the body is 

 more obtusely rounded than the head. 



[Belongs to Hi/dro<:,harcs. — Lec] [203] 



3. H. NIMBATUS, — Black ; head, thorax and elytra margined 

 with yellowish. 



Inhabits the United States. 



Hydroph. nimhatus Knoch in Melsh. Catal. 



Head, two diverging punctured lines ; margin yellowish ; la- 

 i)rum, margin yellowish : palpi and base of the antennae yellow- 

 ish : thorax, a much abbreviated impressed oblique line each 

 :^ide before the middle, and another rather longer one on the mid- 

 dle of the lateral submargin ; lateral margin and anterior edge 

 yellowish-white: elytra minutely punctured; lateral margin yel- 

 lowish-white ; beneath black, sericeous with dull yellowish hairs ; 

 feet pale : thighs black at base : tarsi dusky : pectus with a bifid 

 prominence : sternum pale, a little dilated before the intermediate 

 feet ; punctured ; somewhat scabrous near the anterior tip ; be- 

 hind the intermediate feet attenuated, with a slightly impressed 

 line ; posterior tip elongated, acute : venter, terminal segments 

 with a rufous spot each side. 



Length about two-fifths of an inch. 



A very pretty species and not uncommon. 



{^HydrophUus lateralis Fab., is an older name of this species- 

 — Lec] 



SP^MDIUM Fab. 



S. APiciALis [apicale]. — Obscure, pieeous; head black; 



elytra pale at tip. [204] 



Body blackish-piceous, punctured, glabrous, oval : head equal, 



leep black; punctures minute, distinct, dense : antennae piceius ; 



'.lava obconical; black; maxillary palpi pale pieeous, blackish at 



[Vol. III. 



