54 



6. Elytra entirely green or blue green. Legs entirely yellow, 



B. stomoides differs from all the following in having the antennae entirely 

 yellow-red. 



B. decorum, monticola, and Stephensi. 



All these species measure from 2| to 2§ lines in length. Slephensi is at 

 once recognised by a distinct red blotch before the apex of each elytron ; 

 while decorum is immediately differentiated from monticola by its larger size 

 and by the sides of the elytra being nearly straight (parallel), those of monti- 

 cola being distinctly rounded. 



Legs yellow with darker femora. 



B. brunnipes. Thorax much shorter than in others of division 6. Length 

 2 \ lines. 



Legs brown, yellow, or pitchy. 

 B. tibiale. Length 2 \ lines. 

 B. atrocceruleum. Length 2 lines. 



Both these species are dark blue-green above. In the former the thorax 

 is not much narrowed behind and the elytra are rounded at the sides ; in the 

 latter the elytra are nearly parallel-sided, and the thorax is distinctly narrowed 

 behind. Of these green " bembids," which are somewhat difficult to identify 

 by a beginner, brunnipes is decidedly the commonest ; monticola, tibiale, and 

 atrocceruleum are tolerably common among the shingle on the banks of rivers ; 

 decorum and Stephensi are more local, and stomoides is scarce. 



7. Elytra green with yellow markings. 



B. lunatum, the largest species of the genus, measures about 3 lines in 

 length, and is dark green with a curved crescent-shaped veilo wish mark before 

 the apex of each elytron, without any markings towards the base, 



B. iestaceum. Elytra green with very large yellow spots at shoulders and 

 apex, so large that the elytra appear to be yellow with a green suture, and a 

 transverse band in the middle of the same colour. First three joints of the 

 antennae pale. Length 2J lines. 



B. saxatile. Elytra green, with a yellow spot at the base and a small round 

 yellow spot before the apex ; antennas with three basal joints pale ; legs red. 

 Length 2 lines. 



All the following species are green, and the markings consist of a shoulder' 

 spot, and one near the apex which is not small and round. 

 B. anglicanum. Length 2J lines. Antennae with the first three joints 

 pale ; legs entirely yellow. 



