30 BEETLES. 



* //. incrqualis, Fabr. Eusty-yellow, everywhere closely and 

 thickly punctured. The anterior and posterior borders of the 

 pronotum are black. Length, o mm. It abounds in ponds 

 and ditches. 



* ff. picipes, Fabr., is 5 mm. long. The upper surface and 

 legs are dark orange, and the pronotum is black behind, whilst 

 the lateral borders of the wing-cases are dark brown. It is 

 common in ditches and puddles in the London district. 



* IT. planus, Fabr. Black, somewhat flattened, with the 

 front and back of the head reddish-brown. Each elytron has 

 five rows of coarse punctures. Length, 6 mm. It is common 

 in ponds and ditches. 



* H. palustris, Linn. (Plate IV., Fig. 2). Wing-cases dark 

 brown ; pronotum bordered with reddish-brown on the sides. 

 Prosternum and legs rusty-red. Length, 4-5 mm. It is common 

 everywhere in standing water. 



Genus Laccophilus, Leach. 



These are oval, slightly convex beetles. The scutellum is 

 not visible. The antennae are slender and filiform. They are 

 found in clear standing water, and are very restless, constantly 

 swimming about near the bottom. 



* L. minutus, Linn., is 4-5 mm. in length. The wing-cases 

 are dark brown, with four large and two smaller spots. It is 

 common everywhere. 



Genus Colymbetes, Clairv. 



Scutellum distinct. The prosternum is prolonged into a 

 point behind. Front legs expanded in the males. They are 

 found in lakes and ponds. 



* G. (CpnaiojJterus) fuscus, Linn. (Plate IV., Fig. o), is the 



