34 [April, 1S44. 



Staphtliniu.e, Leach. 

 Xantholinus, Dahlman. 



1. X. palliatus, Black-piceous ; elytra and feet pale testaceous. — 2i 1. long. 

 Pennsylvania. 



Staphylinus palliatus, Melsh. Catal. 1305. 



Black, shining: head oblong, as long as the thorax, and a little wider; base 

 rounded, with the sides rectilinear; impressed lines between the eyes profound ; 

 sparsely and profoundly punctured, with the medial space impunctured ; black, 

 glossy : palpi rufous : antennae, second joint somewhat longer than the third ; 

 joints 4-10 subequal, transverse; brown, with the two basal joints rufo-testa- 

 ceous : thorax not as wide as the elytra, attenuated towards the base, where it 

 is regularly rounded ; apex obtusely rounded ; black, highly polished ; dorsal 

 punctures seven or eight, lateral series about six or seven puncture ; punctures 

 very minute: scutel dark, sparsely punctured: elytra about the length of the 

 thorax, pale testaceous, sparsely punctured, punctures placed in irregular series : 

 abdomen sparsely punctured, black, with the segments posteriorly obsoletely 

 piceous : parapleural anil feet pale testaceous : pectus black. 



2. X. obsidianus. Black, glossy ; dorsal series of punctures five ; feet dark 

 reddish-brown. — 3£ 1. long. Pennsylvania. 



Antenna? a little longer than the head, second and third joints almost of 

 equal length, joints 5-10 subequal, transverse ; fuscous, with three basal joints 

 black-piceous : head oblong, slightly attenuated anteriorly ; sides subrectilinear ; 

 posterior angles rounded; black, shining, with numerous well impressed punc- 

 tures ; middle space impunctured ; impressed lines between the eyes profound ; 

 mouth and palpi dark rufo-piceous : thorax not as wide as the head, or elytra, 

 slightly contracted behind; angles rounded; dorsal punctures five, lateral series 

 five-punctured ; an irregular large puncture on each of the anterior angles ; 

 black, very shining: scutel black, with about four profound punctures: elytra 

 longer than the thorax, sparsely and irregularly punctured ; black, with a red- 

 dish-brown tinge, glossy : abdomen minutely punctured, black, glossy, with the 

 posterior margins of the three terminal segments distinctly rufo-testaceous : 

 femora and tibiae dark reddish-brown : tarsi paler : pectus black : coxai black- 

 piceous. 



3. X. sanguinolentus. Black ; thorax, elytra and feet rufo-testaceous. — 

 3-j 1. long. Pennsylvania. 



Staphylinus sanguinolentus, Melsh. Catal. 1310. 



Elongate slender, subcylindric. Antennae not much longer than the head, 

 second joint hardly longer than the third; joints 5 — 10 subequal, transverse; 

 fuscous, with two basal joints rufous, and tip of apical joint testaceous: head 

 oblong, a little wider than the thorax ; sides rectilinear, scarcely narrowed at 

 apex ; black, glossy, sparsely punctured, with a medial space impunctured ; lines 

 between the eyes deeply impressed; posterior angles obtusely rounded: thorax 

 narrower at base than at apex ; rufous glossy, with about four or five very 

 slightly impressed, almost invisible, dorsal punctures; lateral series with about 

 three or four very obsolete punctures; angles rounded, anterior ones, obtusely : 

 elytra scarcely longer than the thorax, obsoletely punctured, rufous, paler than 

 the thorax : abdomen elongated, very minutely punctured, black, with the mar- 



