﻿62 BRITISH BEETLES. 



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

 needle-poiutedj as in Bembidium. 



Their antenute are ten-jointed, and the coxse 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, //. 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 (Plate III. 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 coxaj enlarged 

 in front. Some gaily-spotted species [Hyroporus rivalls, 



