BEETLES. ?A 



largest of the genus. The under-surface is black, with brown 

 legs. It is common everywhere. Length, 16 mm. 



* C. {Rhantus) pulverosus, Stephens, is 12 mm. long, and 

 is flattened; the wing-cases are brownish -yellow sprinkled 

 with black dots. The under-surface is entirely black. 



* C. {Rhantus) iwtatiLS, Fabr. (Plate IV., Fig. 4), resembles the 

 last species, but has the prosternum yellow. Length, 10 mm. 

 Both are common in the London district, though local else- 

 where. 



Genus Ilybius, Erichs. 



This genus is similar to the last, but the two end joints of 

 the labial palpi are nearly equal in length. They are moderate- 

 sized, somewhat convex beetles, and live in wells and in other 

 standing water. 



* I. fuliginosus, Fabr. (Plate IV., Fig. 5). The pronotum and 

 •elytra are bronzy, with a uniformly broad, yellowish-brown 

 border. 



* /. fenestratus, Fabr., is only slightly convex, and has 

 the border narrowed behind. Both these species are about 

 10 mm. in length, and are common in ditches and ponds. 



Genus Agabus, Leach. 



Appendage of tlie prosternum pointed ; scutellum distinct ; 

 hind legs with two equal movable claws. They are flattened 

 beetles, mostly brown, and of medium size. They are generally 

 found in running water, and in the winter reside gregariously 

 under moss or at the roots of trees. 



* A. hipustulatus, Linn. (Plate IV., Fig. 6). This species is 

 oval, and has two dots on the front of the head. It is common 

 everywhere. Length, 10 mm. 



* A. ckalconotus, Panz., is smaller than the last species, and 



