On Aquatic Carnivorous Coleoptera or Di/liscidcB. 375 



:^33. Hyphydrus grandis, Cast. M.C.— Ovatus, brevis, crassus, thorace basi elytris 

 angustiore, dense punctatus, rufescens, thorace antice et postice nigro, elytris irre- 

 gulariter nigro-signatis, stria discoidali basi distincta. Long. 6, lat. 4 m.m. 



Man, nitidulus, fortiter punctatus, tarsis 4 anterioribus deplanatis, trochan- 

 teribus anterioribus valde elongatis. 



Fern., subopaca, sat fortiter punctata, tarsis 4 anterioribus comprcssis, trochan- 

 teribus anterioribus brevibus. 



In this species and H. major, the front legs are more elongate, and the outline 

 of the body is much interrupted at the junction of the thorax and after body. 



Africa, (Gaboon). 26. 



334. Hyphydrus major, n. sp.— Ovatus, latus, sat brevis, thorace basi elytris multo 

 angustiore, dense, oequaliter, sat fortiter punctatus, rufescens, thorace antice et 

 postice nigro, elytris irregulariter nigro-signatis, stria discoidali sat distincta. 

 Long. 6i, lat. 4 m.m. 



Ma,s, nitidulus, fortiter punctatus, tarsis 4 anterioribus deplanatis, trochanteribus 

 anterioribus valde elongatis. 



Fein., subopaca, minus fortiter punctata, tarsis 4 anterioribus compressis, trochan- 

 teribus anterioribus brevibus. 



Differs from H. grandis, only by the rather more elongate form, the rather longer 

 and thinner front legs, and slightly more even and finer sculpture. The sexual 

 characters are quite the same, and I cannot feel sure whether this be more than a 

 local form of H. grandis. 



Lower Egypt, and "Nubia. 27. 



335. Hyphydrus parvicollis, n. sp. — Ovalis, sat latus, valde convexus, ferrugineus, 

 thorace antice et postice nigro, elytris nigro-signatis, thorace parvo, basi elytris 

 angustiore; fortiter crebre, sequaliter punctatus. Long. 5, lat. 3 m.m. 



Head small, rather coarsely and closely punctured. Thorax very transverse, the 

 sides strongly oblique, of a dark yellowish colour, black in front and behind, rather 

 coarsely and moderately closely punctured. Elytra rather coarsely punctured, the 

 punctures rather close, much finer towards the sides, the punctures, except for 

 this, are all of one size ; they are of a yellowish or tawny colour, black along the 

 suture, outside this with a black band, and external to this with one or two other 

 black marks. The under surface is reddish and shininc ; the prosternum bears on 

 the front a small acute tubercle. 



I have seen only three individuals of this species, they all agree exactly, and are 

 I believe males, though they have the tarsi slender, the joints compressed laterally 

 and not dilated ; the shape of the front tibia is ^^eculiar, it is slender, and on the inner 

 side is slightly dilated above the middle, and thence obliquely narrowed to the knee. 



Gaboon ; found by Henri DeyroUe. 28. 



