62 BRITISH BEETLES. 



Haliplus, the apical joint of the palpi is very small and 

 needle-pointed, as in Bembidium. 



Their antennae are ten-jointed, and the coxae of the 

 hinder legs not enlarged in front, but produced behind 

 into a semicircular flat plate, which in Haliplus covers 

 three (and in Cnemidotus six) segments of the abdomen. 



They are all small, ovate, and convex ; mostly light- 

 yellow in colour, varied with obscure darker patches. 

 One species, H. elevatus, is more elongate and flatter than 

 the rest, and is also more distinctly marked ; it has strong 

 longitudinal ridges on its elytra, and long straggling 

 legs, and may be found in running streams, clinging to 

 stones and weeds. Another, H. obliquus (Plate III, Fig. 

 4), is prettily spotted; it occurs in stagnant water. 



Descriptions of our species are to be seen in a paper 

 by Dr. Power, published in an early number of the 

 ' Zoologist/ 



The PELOBIIDES, represented by one species, Pelobius 

 Hermanni (PlateIII.Fig.5),have the antennae 11-jointed, 

 the hinder coxae not produced into a plate, but enlarged 

 in front, the scutellum distinct, tarsi all five-jointed, the 

 head stretched out, and the legs adapted more for walk- 

 ing than swimming. This insect, commonly known 

 as " the Squeaker " (about half an inch long, convex, 

 dull black and red in colour) is found somewhat plenti- 

 fully in stagnant ponds near London, clinging to weeds, 

 and grovelling in mud : it makes a sharp noise by 

 rubbing the hard reflected margin of the last segment 

 of its abdomen in a groove under each wing-case. 



The HYDROPORIDES are all small, with no visible scu- 

 tellum, only four joints to the front and middle tarsi 

 (often much widened) and the posterior coxae enlarged 

 in front. Some gaily-spotted species (Hyroporus rivalis, 



