CARABIDAE. 1 1 



tircly enclosed, presternum prolonged behind; mesosternnm small, 

 deeply depressed, side pieces diagonally divided, epimera reaching 

 the coxae; metasternum very short, side pieces broad, with distinct 

 epimera. Elytra connate, with very faint stria?, the external ones 

 entirely obliterated. Anterior tibia? gradually thickened, hairy 

 externally, deeply sulcate and emarginate near the apex internally, 

 with the inner spur remote from the apex. Middle tibia? pubes- 

 cent; posterior tibia? pubescent internally. Anterior tarsi of the 

 male with two dilated joints densely covered beneath with hair. 



The genus Metrius is placed by Schaum in the preceding tribe, 

 which he defines as having the mesosternum carinate in front. 

 Such is not the case with this genus, which it therefore becomes 

 necessary to remove. It cannot certainly enter any other tribe 

 known to me, and I have therefore been compelled to separate it 

 as distinct. 



Tribe VII.— PROMECOGNATHmi. 



This tribe is represented in the United States by a single Cali- 

 fornian species (Promecognathus Icevissimus). It is an elongate, 

 shining insect, with entirely smooth elytra, and long, narrow man- 

 dibles. 



The head is narrow, with the eyes small, and the clypeal suture 

 transverse; the mandibles are very long, slender, and decussating; 

 the labrum is bisinuate; the mentum is very transverse, filling up 

 the fissure usually seen each side of the gular suture, so as to cover 

 the base of the maxilla? (as in Scarites), not deeply emargiuate, 

 with a large medial tooth; gular suture distinct. Four joints of 

 the antenna? are smooth, the first much longer and stouter than the 

 others; the remaining joints are less densely pubescent than usual. 

 The anterior coxa? are entirely enclosed; the presternum is not 

 produced behind. The trunk is pedunculated in front. The 

 mesosternum is declivous, the side pieces diagonally divided, with 

 the epimera extending to the coxa?. The metasternum is very 

 short, the side pieces small, without visible epimera. The elytra 

 are connate, without dorsal stria?, and the marginal stria and its 

 punctures are very close to the margin. Anterior tibia? gradually 

 thickened, obliquely sulcate and deeply emarginate internally, with 

 the inner spur remote from the apex. Middle tibia? pubescent. 

 The tarsi are not dilated in the male. 



I have been compelled to dilate upon this, and some other tribes 



