14 COLEOPTERA OF NORTH AMERICA. 



distinct from Dyschirius. The head in Schizogenius is remarkably 

 sculptured, with deep longitudinal grooves. 



Sub-Family II.— OZ.ENIDAE. 



Mesosternum very narrow; middle coxa? contiguous. 



On this single character I have separated as a sub-family two 

 small tribes. They differ from each other by the form of the meso- 

 thoracic epimera, which in Ozaenini reach the coxae, and in Pseu- 

 domorphini do not. Nevertheless, these groups are related, and the 

 transition is clearly shown by Physea, which, with all the essential 

 characters of Ozsena, has the dilated frontal plates and the exca- 

 vated femora of the other tribe. 



I have observed certain anomalies in the form of the eyes in 

 these tribes, which I do not find in other Carabidse. 



In Ozasna the eyes are truncated behind, and in Physea even 

 emarginated by the inflated portion of the sides of the head. In 

 Pseudomorphus the eyes are distinctly angulated on the outer 

 margin, where they are limited by the corneous under-surface of 

 the head, so as to be confined entirely to the upper surface. 



Tribe I.— OZ^NINI. 



The species of this tribe differ from all the preceding genera in 

 having the mesosternum very narrow, so that the middle coxa3 are 

 almost in contact. There are considerable differences in other 

 respects between the two genera before me, neither of which have 

 yet been found within our limits, though either may be hereafter 

 discovered in Texas. 



In Ozasna the antenna? are inserted as usual, slightly thickened 

 externally, with four basal joints more smooth than the rest; the 

 legs are not compressed, the anterior tibia? deeply emarginate 

 internally, with the upper spur represented only by a few bristles; 

 the mentum is broad, with the middle lobe nearly as long as the 

 lateral portions ; the gular suture not very evident. 



In Physea the sides of the front are broadly dilated, and the 

 antennae are inserted under these plates; the antennae are filiform, 

 with smooth joints, loosely clothed with hair. The mentum is 

 deeply emarginate, with the middle tooth moderate in size; the 

 gular suture not very evident. The legs are compressed, with the 



