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Platyderus by its reddish thorax and elytra, the sides of the latter being 

 nearly straight. 



Pterostichus is generally narrower, the upper side chiefly shining black, 

 and the third interstice of the elytra with one or more impressions. . 



The species included in this part of Amara are generally broad, the pre- 

 vailing colour being pitchy black or bronze-brown ; and the third interstice 

 of the elytra is without impressions. 



Group B. 



a. — Size, under \ inch - - Trechidce (see after.) 



b. — Size i inch or more. 



1. — Last joint of palpi hatchet-shaped. 

 Elytra black - - Licinus. 



Elytra spotted or marked with red - - Panag&us. 



2. — Last joint of palpi not hatchet-shaped. 



Thorax longer than broad, narrowed behind - - Patrobus. 

 Thorax not longer than broad, and scarcely narrowed behind - 

 Pogonus* 



LORICERA. 



The only British species, L, pilicornis, easily distinguished from all the 

 other Geodephagous beetles by the long bristles on the basal joints of the 

 antennse, measures about J -inch in length, is of a dark bronze colour, and the 

 elytra have each a row of three distinct depressions in the third interstice. 

 The species occurs everywhere abundantly, under stones and in moss, &c. 



PANAGiEUS. 



Of this genus we have two species, P. crux-major and P. quadripustulatus. 

 The former is the larger of the two measuring 4 lines in length, and has the 

 elytra red with the base, suture (narrowly), apex, and a broad band across 

 the middle, black. The latter band with the dark suture forms the cross from 

 which is derived its specific name. P. quadripustulatus is a smaller insect, 

 about 3 lines in length, in which the ground colour of the elytra is black, 

 with a red band across the front and a red spot on each elytron near the apex. 

 Both species are principally fen insects, but crux-major seems more widely 

 distributed than its congener. 



CALL1STUS. 



The single species, C. lunatus, one the most handsome of British Geode- 

 phaga, is very easily recognised by the colour of the elytra, which are pale 

 yellow with black markings as follows : a spot at the shoulder, a band across 

 the middle of each elytron which reaches to the side margin but not quite to 

 the suture, and the hinder part of the elytra, leaving only a minute yellow 



