732 On Aquatic Carnivorous Coleoptera or Dytiscide. 
basal portion of the wing-cases a fine sexual sculpture consisting of very short 
isolated scratches. 
The species differs from C. asiaticus, by its form which is broader in front and 
more convex, the colour of the undersurface is darker and the female has a fine 
sexual sculpture. The hook-like dilatation near the termination of the elytra is 
less distinct, and the terminal portion of the band is less definite: the epistome is 
nearly entirely yellow, but there is generally a little descent of the dark colour in 
the middle so as to diminish there the length of the yellow mark. 
It also resembles excessively the Javanese varieties of D. tripunctatus, but is 
smaller, has a pale patch on the sides of the breast ; and the patches of pubescence 
on the intermediate male tarsi are narrower, and extend on to the third joint. 
Siam, and interior of Malay peninsula, Castlenau. 1074. 
1144. Cybister lewisianus, Sharp, Tr. Ent. Soc. Lond. 1878, p. 46.—Ovalis, 
convexus, anterius evidenter angustatus, supra olivaceo-niger, capite anterius 
prothoracisque lateribus testaceis, elytris margine externo (cum epipleuris) sat late 
testaceo ; corpore subtus testaceo, ad latera anguste nigricante, pectore in medio 
plus minusve infuscato ; pedibus quatuor anterioribus testaceis, tarsis intermediis 
piceis; pedibus posterioribus femoribus rufis, tibiis tarsisque nigricantibus; 
elytrorum epipleuris versus apicem distincte latioribus et planatis ; processubus 
coxalibus apice conjunctim fere truncatis. Long. 25, lat. 14 m.m. 
The male anterior tarsi are small, but do not differ much from those of 
D. tripunctatus ; the intermediate feet appear at first entirely destitute of sexual 
pubescence, but on careful examination there is seen a narrow line of very short 
hairs on the first two joints. The female has no sexual sculpture. 
Although very similar to ©. asiaticus and C. fumatus the species is readily distin- 
guished by the form of the coxal processes which are soldered together to the 
apex so that there is scarcely any notch between them: the epipleurz before 
their termination are also slightly, but undoubtedly, broader than in the allied 
species. 
The specimens from China are larger and broader than those from Japan, and the 
colour of the undersurface is darker in the middle. 
Japan, China, (Shanghai, Felder and Abbé David), Assam. 1075. 
1145. Cybister senegalensis, Aubé, Trogus senegalensis, M.C_—Minor, ovalis, sat 
convexus, parum latus, supra olivaceo-niger, capite anterius prothoracisque 
lateribus testaceis, elytris margine externo (cum epipleuris) sat late testaceo; corpore 
subtus nigricante, pedibus quatuor anterioribus testaceis, tarsis intermediis 
pedibusque posterioribus picescentibus, antennis testaceis. Long. 20, lat. 10 m.m. 
