80 



Unipustulatus differs from bipustulatus by being larger (Jin. in length), 

 the head wider in proportion to the thorax, and the latter more narrowed 

 behind, and by having the underside of the breast with a yellow spot on each 

 side. Bipustulatus has the underside of the breast entirely black, and is a 

 more slender looking insect. Bipustulatus is common and generally dis- 

 tributed ; unipustulatus and sodalis are local, and peltatus rather scarce. 



BROSCUS. 



B. cephalotes is sufficiently distinguished from all other Geodephaga by its 

 size (| inch) and the distinct neck to the elytra. The colour is dull black. 

 It is common on most sandy shores, where it forms a burrow under drift* 

 wood, &c, but it is not confined to the coast, being occasionally taken very 

 far inland. 



MISCODEKA. 



The single species M. avctica, which occurs on high mountains in Wales 

 and Scotland, has a superficial resemblance to a Dyschirius from its shining 

 bronze colour, rounded thorax, and elongate form, but is easily distinguished 

 by its larger size (3 lines), and by not having the anterior tibiae flattened and 

 toothed. 



SPHODRUS. 



S. leiicophthalmus somewhat resembles a large wide Broscus, but is easily 

 known from that genus by the absence of a distinct neck to the elytra. Its 

 colour is dull black, and the length about one inch. It occurs, but not com- 

 monly, in cellars, and is known from all other large Geodephaga by the 

 almost absence of striation on the elytra. 



PRISTONYCHUS. 



P. terricola, the only species of this genus, is common in cellars and out- 

 houses, and is at once recognised by its shining blue-black colour, and by 

 the distinct row of impressions in the outer interstice of the elytra. In length 

 it measures from \ to f inch. 



CALATHUS. 



The seven species of this genus may be separated by means of the follow- 

 ing table : — 



A. — A row of impressions in the third, and another row in the fifth inter- 



stice of each elytron - - cisteloides. 



B. — A row of impressions in the third interstice only. 



1. — Thorax with the side margin turned upwards behind to form a side- 

 border ; posterior angles rounded - - piceus 



