738 On Aquatic Carnivorous Coleoptera or DytiscidcB. 



the series of punctures along the middle coxal cavity is coarse, although somewhat 

 obsolete and irregular, but there is no gibbosity of the metasternum ; the epipleurse 

 are but little dilated in their posterior portion. 

 The specimens I have seen are in bad condition. 



Abyssinia, Raffray and Beccari, (Lebka, Bogos.) 1087. 



1154. Cybister buqueti, Pi.uhe,Trogus huqueti, M.C. — Major,ovalis,latus,convexus, 

 anterius conspicue angustatus, supra niger, capite anterius et prothorace marginibus 

 omnibus testaceis, elj^ris vitta intra.marginali (ad apicem suturam fere attingente) 

 testacea ; subtus testaceus, capite pectoreque in medio fuscis, pedibus anterioribus 

 testaceis, posterioribus piceis, femoribus apice testaceo ; elytrorum epipleuris ante 

 apicem latis ; trochanteribus posterioribus apice libero, acuto. Long. 39 m.m., lat. 

 22 m.m., alt. 13 m.m. 



The male has the front tarsi rather small, attaining about 3 m.m. in the 

 transverse direction ; the two basal joints on the middle tarsi have each along the 

 middle an elongate, narrow patch of short sexual pubescence, their claws are rather 

 short and slender, but a good deal unequal; in the hollow near the articulation of 

 the hind coxse there are about ten short, coarse depressions or grooves. The 

 female is unknown. 



This and the following species are remarkable by their thorax being entirely 

 margined with yellow, just in the same way as Dytiscus marginalis and its allies : 

 at the sides the margin is very broad, in front it is moderately broad, but at the 

 base narrow, so that on each side it almost thins out before joining the lateral 

 yellow band. 



Africa, (Senegal.) 1085. 



1155. Cybister dytiscoides, n. sp. — Major, ovalis, convexus, anterius angustatus, 

 supra niger, capite anterius prothoraceque marginibus omnibus testaceis, elytris 

 vitta intraroarginali (ad apicem suturam fere attingente) testacea ; subtus testaceus, 

 capite et medio pectoris nigricantibus; pedibus anterioribus testaceis, posterioribus 

 piceis, femoribus apice testaceo; trochanteribus posterioribus apice libero, acuto. 

 Long. 37 m.m., lat. 191 m.m., alt. 12| m.m. 



The male has the front tarsi small, attaining about 2i m.m. in the transverse 

 direction ; the two basal joints of the intermediate tarsi have each along the middle 

 a broad patch of short sexual pubescence ; in the hollow near the articulation of the 

 hind coxae, there are five or six short longitudinal depressions, these depressions are 

 irregular and the inner two or three quite obscure. 



This species is very closely allied to Cybister buqueti : the only specimen 1 have 

 seen indicates a smaller species, with broader patches of sexual pubescence on the 



