124 THE INSECTS OF GAYNDAH, 



spot behind the middle, the apex, and the lateral margins, of a 

 pale red. 



165. — Htdropords luridus. n. sp. 

 Length Ij lines. 

 Only differs from the last in being entirely of a lurid hue, 

 with the base of the thorax brown, and some indistinct patches 

 of the same colour on the elytra, these last are proportionately 

 broader and are entirely without the subsutural stria. 



166. — Htdroporus basalts, n. sp. 

 Length f of a line. 

 Ovate, rather depressed, very finely punctured. Head dark 

 brown, nitid, with scarcely a trace of lateral depressions. 

 Thorax of the same form as the two last described species, of a 

 yellow colour, with a narrow apical and broad basal margin of 

 a deep brown, and with the basal striol^ the same as in 

 H. Mastersii and luridus. Elytra deep brown, with the sides and 

 two somewhat indistinct vittse of variable length, but not reach- 

 ing to the base or apex, of a yellowish hue, and with the sub- 

 sutural stria distinct and the thoracic striola continued to 

 the middle of each elytron. 



167. — Htdroporus politus. n. sp. 

 Length I of a line. 

 This may probably not belong to the present genus. It is 

 of an elongate convex form almost acuminated at the apex of the 

 elytra and very nitid on the entire surface. The head and thorax 

 are of a dark red ; the elytra are of a pitchy black ; the last 

 six or seven joints of the antenna seem moniliform. 



Necterosoma. n. gen. 



Head, antennae, and parts of the mouth as in Hydroporus. 

 Body short, thick, ovate and slightly depressed. Anterior thighs 

 and tibise long and stout, the latter in the male largely emargi- 



