738 On Aquatic Carnivorous Coleoptera or Dytiscide. 
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 epipleure 
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, Aube, Trogus buqueti, M.C._—Major, ovalis, latus, convexus, 
anterius conspicue angustatus, supra niger, capite anterius et prothorace marginibus 
omnibus testaceis, elytris vitta intramarginali (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 coxee 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 
yitta intramarginali (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. 192 m.m., alt. 122 m.m. 
The male has the front tarsi small, attaiing about 23 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 coxe, 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 I have 
seen indicates a smaller species, with broader patches of sexual pubescence on the 
