742 On Aquatic Carnivorous Coleoptera or Dytiscida. 



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 ; corpora subtus variegato, ex parte majore 

 testaceo, j^rosterno 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 supei-ne 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, teniii, 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. 

 Long. 31, lat. 17 ui.m. 



Thi! male front tarsi are large attaining 3j m.m. in the transverse direction ; the 

 intermediate feet bear a large patch of short sexual i^ubescence 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., Tragus chinensis, M.C. — Ovalis, supra nigri- 

 cans, capite anterius prothoraceque ad latera testaceis, elytris vitta intramarginali, 

 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. 15^ 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. 



