On Aquatic Carnivorous Coleoptera or Dytiscide. 375 
333. 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. 
Mas, nitidulus, fortiter punctatus, tarsis 4 anterioribus deplanatis, trochan- 
teribus anterioribus valde elongatis. 
Fem., subopaca, sat fortiter punctata, tarsis 4 anterioribus compressis, trochan- 
teribus anterioribus brevibus. 
In this species and H. major, the front legs are more elongate, and the outiine 
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, cequaliter, sat fortiter punctatus, rufescens, thorace antice et 
postice nigro, elytris irregulariter nigro-signatis, stria discoidali sat distincta. 
Long. 62, lat. 4 m.m. 
Mas, nitidulus, fortiter punctatus, tarsis 4 anterioribus deplanatis, trochanteribus 
anterioribus valde elongatis. 
Fem., 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, zequaliter punctatus. Long. 5, lat) 3) 1mm. 
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 shining ; 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 peculiar, 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 Deyrolle. 28. 
