On Aquatic Carnivorous Coleoptera or Dytiscidai. 377 



inis segmento a23icali transversim impresso, apice medio incrassato ; tibiis anterior- 

 ibus dilatatis. 



Senegal ; Cape Verde Islands. 31. 



339. Hypliydrus stipes, n. sp. — Ovalis, sat convexus et latus, crebre sat fortiter, 

 minus inaequaliter punctatus, piceus, capite, thoracis lateribus angustius elytrisque 

 rufo-testaceis, his nigro-signatis, stria discoidali ad basin distincta ; tarsorum anti- 

 oorum articulo 3*^ nigricante. 



Mas, trochanteribus anterioribus incisis, incisuroe margine esterno crasso ; 

 abdominis segmento apicali prof unde transversim impresso, apice medio late incrassato, 

 tibiis anterioribus leviter dilatatis. Long, ih, lat. vix 3 m.m. 



Fern., minor, paulo magis subtiliter punctata. 



Closely allied to Hyphydrus crassus, but scarcely so broad, with the sculpture of 

 the upper surface not quite so dense, the finer punctures being not so large, and 

 with the male tibias a good deal nari'ower. The greater development of the finer 

 punctures of the upper surface readily distinguishes it from Hyphydrus pictus, (No. 

 336). 



Madagascar, Bourbon. 82. 



340. Hyphydrus scriptus, Aubd,M.C. — Ovalis, convexus, latus, nitidus, injsqualiter 

 sat crebre punctatus, picescens, capite, thoracis lateribus angustius, elytrisque rufo- 

 testaceis, his nigro-signatis, stria discoidali ad basin distincta. 



Mas, trochanteribus anterioribus fere ad basin incisis, tarsorum quatuor anti- 

 corum articulo basali posterius fortiter dilatato ; tibiis anterioribus bene dilatatis ; 

 abdominis segmento apicali transversim impresso, apice medio incrassato. Long. 

 4i, lat. 3 m.m. 



Fern., paulo minor et subtilius punctata. 



A species of short, broad and convex form, with the fine punctures of the elytra 

 distinct but small and not dense, so that they are quite distinct from the lai-ger 

 punctures although these are not coarse or conspicuous. 



I have seen only a pair of this species, the female was one of two specimens in 

 Dejean's collection labelled " Hyphydrus scriptus ? h. in Ins. Bourbon," the other 

 individual being a female of H. stipes. The female of this species has the front 

 tarsi yellow, while the third joint is infuscate in the male. 



I cannot satisfactorily assign the desci'iption given by Fabricius (Ent. syst. supp. 

 p. 65) to this or any other species, but it no doubt refers to some species of 

 Hyphydrus {Vide Syst. El. L p. 257 where it is associated with Dytiscus ovatus, 

 under the generic name Hydrachna). Although it is not probable that Aube was 

 correct in thinking the present species was the one intended by Fabricius, I have 



