576 TRANSACTIONS OF THE 



humerus not reaching the tip ; tergum black with a piceous 

 tinge ; feet yellowish-white ; tibiae and tarsi a little darker. 



Length over three-twentieths of an inch. 



Gravenhorst considered this insect as specifically identical 

 with his piceus, but in his remarks on that species he states that 

 " huic Oxytclo alius affinis est, quani D. Prof. Knoch 0. sculptus 

 nuncupavit. DiflPert thorace lateribus subrotundatis, basin versus 

 paulo angustiore, coleoptris breviore et paulo angustiore, fusco 

 seu rufo ; coleoptris quadratis, rufescentibus seu piceo-rufo." 

 These diflferences of character indicate a diflFerence of species. 

 It is the Aleochara sculpta of Melsheimer's Catalogue. 



2. 0. RUGULOSUS. — Black; longitudinally wrinkled; elytra 

 obscure piceous. 



Inhabits Mexico. 



Body black, rather short, with numerous punctures, somewhat 

 confluent into longitudinal wrinkles; head with three grooves, 

 rather slightly impressed, the lateral ones dilated ; antennae 

 brown, dull honey-yellow at base ; palpi dull honey-yellow ; tho- 

 rax with three grooves, of which the middle one is wider before 

 and the lateral ones wider behind ; each side a little concave, 

 the edge slightly reflected : anterior [461] angles acute; lateral 

 edge arquated ; rounded behind ; elytra transverse quadrate, 

 blackish piceous; tergum with dense minute punctures; feet 

 honey-yellow. 



Length less than one-tenth of an inch. 



This does not altogether agree with the var. a. of the carinatus 

 of Gravenhorst, and to which he has given the name of insignitus. 

 The present species is proportionally much shorter than the cari- 

 natus. It is not more than half the length of that species. It 

 is more than probable that the insignitus is also a distinct 

 species. 



I obtained three specimens of the rugulosus in Mexico. 



[According to Erichson is the European 0. niticlulus. — Leg.] 



3. 0. CORDATUS. — Black ; elytra whitish, with a common 

 brown spot. 



Inhabits Virginia. 



Body black, with numerous small punctures ; mandibles pice- 



[Vol. IV. 



