BEETLES. 29 



body oval ; pronotum broader than long. The last pair uf 

 legs are flattened and paddle -shaped, set with long bristles. 

 The front tarsi have small pul villi in the males of the larger 

 species, which enable them to keep their footing on smooth 

 surfaces. They are more common in standing than in flowing 

 water. 



Genus Haliplus, Latr. 



Small, elongated, oval beetles, measuring about 3-4 mm. in 

 length, with the body stout and strongly convex beneath. 

 The pronotum is produced into a spine behind. They live in 

 stagnant water. 



* H. flavicollis, Sturm. Pale yellowish -brown, with the 

 elytra darkly punctate-striate. It is found in ditches, &c., 

 but is rather local. 



* H. ruficollis, De Geer. Shortly oval, yellowish-brown ; 

 pronotum with a deep longitudinal furrow on each side. This 

 species is of common occurrence in stagnant pools, but is 

 also occasionally found in running streams. 



Genus HvPHYDrtUS, lUig. 



Body globose ; oval, strongly convex, both above and 

 beneath. The hind tarsi have two claws of unequal size. 

 These beetles abound in stagnant water. 



* H. ovatus, Linn. (Plate lY., Pig. 1). Ptusty-red, with the 

 wing-cases darker, often blackish. It is larger than the 

 species of Haliplus, and is common in pools and ditches. 



Genus Hydroporus, Clairv. 



Body elongated, oval ; hind legs filiform. The genus includes 

 a large number of small species, some of which live in flowing, 

 and others in stagnant, water. 



