382 On Aquatic Carnivorous Coliuplcra or /-'yti.scida;. 



japimicus, and H. frontalis, this species is easily distinguished when the two are 

 compared by the more slender and elongate third joint of the front tarsi, this 

 difference beingf more striking;' in the males than in the females. 



Japan. 42. 



'A52. Hyphydrus oiientalis, Clk., M.C. — Ovalis, latus, convexus, nitidus, confertim 

 fortiter subinggqualiter punctatus, ferrugiueus, supra rufo-testaceus, prothorace 

 basi medio elytrisquo fusco-signatis, his stria discoidali ad basin sat distincta, suturali 

 subobsoleta ; abdomine segmentis basalibus medio subtiliter punctatis. Long 43, 

 lat. vix 3 m.m. 



Mas, tarsorum quatuor anticorum articulo basali sat dilatato ; abdomine segmento 

 basali medio macula rotunda, opaca (?glandulifera). 



Fern., paulo subtilius punctata, pedibus paulo magis gracilibus. 



This species in its general appearance much resembles H. frontalis, (No. 350), 

 but the male tarsi are similar to those of H. Iseviventris. 



Although I have not been able to examine the tarsi of the specimens in the 

 British Museum of Hyphydrus eximius, and H. pulchellus, Clark, I believe they 

 will prove to belong to this species. 



China, (Kiu-Kiang). Also from Formosa ; tlie specimens from this locality are rather more coarsely 

 and distinctly punctured on the elytra, but as the structural and sexual characters seem to be quite the 

 same as in the Chinese specimens, I cannot consider them a distinct species. 43. 



353. Hyphydrus indicus, n. sp. — Ovalis, brevis, .sat convexus, testaceus, 

 prothorace nigro, laterihus late testaceis, elytris nigro-signatis, pectore abdomineque 

 fuscescentibus, tarsorum articulo tertio nigricante ; dense sequaliter punctatus, 

 parum nitidus, elytris stria discoidali sat distincta. Long. 4, lat. 2l m.m. 



Mas, tarsis quatuor anterioribus angustis ; trochantei'ibus anterioribus parum 

 profunde mcisis sed extus spina tenui fere recta armatis ; abdomine segmento 

 apicali apice transversim tuberculato. 



The single individual I have seen of this species indicates it as being very 

 distinct from the others known to me : its form, size, rather dull surface and narrow 

 simple tarsi, would lead one t(j think the male to be rather the other sex, but on 

 careful comparison the characters point it out as allied to H. lyratus, and H. 

 xanthomelas, but undoubtedly connecting them with the African H. crassus and 

 its allies. The close even punctuation is similar to that of the corresponding sex 

 of H. lyratus and H. xanthomelas, while by the structure of the trochanteis it 

 approaches the African species ; the front and middle tarsi are less compressed than 

 in fl. crassus, but much less flat and broad than in H. lyratus and H. xanthomelas, 

 from which species it also departs by its considerably shorter form. 



East India, (ex. coll. Murray). 1 1 25. 



