742 On Aquatic Carnivorous Coleoptera or Dytiscide. 
1160. Cybister gracilis, n. sp.—Ovalis, fere angustus, supra nigricans, capite 
anterius prothoraceque ad latera testaceis, elytris vitta intramarginali, ad apicem 
parum argute delimitata, testacea; corpore subtus variegato, ex parte majere 
testaceo, prosterno pectoreque in medio nigricantibus, abdomine testaceo fuscoque 
fasciato, segmentis 2° et 3° ex parte .majore fuscis; pedibus anterioribus et 
intermediis testaceis, his tarsis piceis, pedibus posterioribus piceis, femoribus ad 
apicem et superne testaceis. Long. 28, lat. 15 m.m. 
The male has the front tarsi large (in proportion to the size of the insect), being 
fully 3 m.m. in the transverse direction ; and the intermediate feet have large 
patches of short sexual pubescence on the two basal joints, as in the allied species ; 
the female is unknown to me. 
This species is of narrow form, and more oblong than its allies, and the colour of the 
outer margin of the elytra is such that the yellow band is less distinctly limited 
externally ; the wing-cases are without coriaceous rugosity ; the different colours of 
the undersurface are sharply defined, the yellow being notably predominant. 
India. 1091. 
1161. Cybister ventralis, n. sp.—Ovalis, sat latus, anterius evidenter angustatus, 
supra olivaceo-niger, capite anterius prothoraceque ad latera testaceis, elytris vitta 
intramarginali, versus apicem hamato-dilatata, tenui, testacea; corpore subtus 
variegato, ex parte majore testaceo, prosterno pectoreque in medio nigricantibus, 
abdomine testaceo nigroque fasciato ; pedibus anterioribus et intermediis testaceis, 
his tarsis piceis ; pedibus posterioribus nigricantibus femoribus ad apicem late rutfis. 
Long. 31, lat. 17 m.m. 
The male front tarsi are large attaining 3% m.m. in the transverse direction ; the 
intermediate feet bear a large patch of short sexual pubescence on each of the two 
basal joints as in the allied species. I have not seen the female. 
This insect is of broader less oblong form than the preceding one ; the dark 
colour on the second and third ventral segments does not extend to the outside of 
the segments, which remains yellow. 
India, (Madras). 1092. 
1162. Cybister chinensis, Motsch., Tvrogus chinensis, M.C.—Ovalis, supra nigri- 
cans, capite anterius prothoraceque ad latera testaceis, elytris vitta intramarginal,, 
versus apicem hamato-dilatata, testacea; corpore subtus variegato, ex parte majore 
testaceo, prosterno pectoreque in medio nigricantibus, abdomine testaceo nigroque 
fasciato ; pedibus anterioribus et intermediis testaceis, his tarsis piceis; pedibus 
posterioribus nigricantibus, femoribus ad apicem late rufis ; elytris versus apicem 
subtilius coriaceo-rugulosis. Long. 282, lat. 152 m.m. 
The male has the front tarsi rather large, attaining 3 m.m. in the transverse 
direction ; the intermediate feet are as in the allies. 
