18 COLEOPTERA OF NORTH AMERICA. 



In these two genera the four basal joints are glabrous and in 

 repose the scape is received in a depression beneath the eye. 



These are insects of moderate or large size, found under stones, 

 or {Fasimachus elongatus Lee.) running on the ground. The 

 genus Pasfmac'/iMS is confined to JSorth America; most of the 

 species are margined with blue. 



Group Clivinae. 



The genera which occur in our fauna are as follows : — 

 Margin of elytra entire. Mandibles flat and arcuate. 

 Anterior tar.si slender in both sexes. 



Palpi dissimilar in the sexes, the terminal joint more dilated in the 



male, excavated beneath with a large sensitive space. Thorax 



globose or globose-oval. Dyschirius. 



Palpi similar in the sexes, not dilated nor excavated in tlie male. 



Thorax more or less quadrate. Clivina. 



Anterior tarsi more or less dilated in both sexes. 



Mentum feebly emarginate. Head not grooved. Aspidoglossa. 

 Mentum deeply emarginate. Head with numerous longitudinal 

 grooves. Schizogenius. 



Margin of elytra interrupted posteriorly and with an internal plica. Man- 

 dibles slender, prolonged not arcuate. Anterior tarsi of both sexes rather 

 widely dilated. Ardistomis. 



In all our genera the ligula is small and is usually hidden by 

 the supports of the labial palpi. The ligula is slender, the tip 

 more or less acute, free and bisetigerous, the paraglossae slender 

 and acute, not longer than it. G^ivina and Dyschirius are best 

 separated by the form of the palpi ; all other characters hereto- 

 fore given fail in our series of species. 



The species are of small size, mostly found in moist places, 

 though some occur under bark of trees. 



It is curious in this tribe that Ardistomis should have the 

 elytral margin interrupted with an internal plica. It thus shows 

 much more affinity with the Harpalinae than do the other genera, 

 and seems to be the nearest Carabine relation of the Panagaeini, 

 instead of the Cychrini as suggested by most authors. 



