382 On Aquatic Carnivorous Coleoptera or Dytiscide. 
japonicus, 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 being more striking in the males than in the females, 
Japan. 42. 
352. Hyphydrus orientalis, CIk., M.C.—Ovalis, latus, convexus, nitidus, confertim 
fortiter subineequaliter punctatus, ferrugineus, supra rufo-testaceus, prothorace 
basi medio elytrisque fusco-signatis, his stria discvidali 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). 
Fem., 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. leviventris. 
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; the 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, lateribus late testaceis, elytris nigro-signatis, pectore abdomineque 
fuscescentibus, tarsorum articulo tertio nigricante; dense zequaliter punctatus, 
parum nitidus, elytris stria discoidali sat distincta. Long. 4, lat. 23 m.m. 
Mas, tarsis quatuor anterioribus angustis; trochanteribus anterioribus parum 
profunde incisis 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 tv 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 trochanters it 
approaches the African species; the front and middle tarsi are less compressed than 
in Hl. 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). 1125. 
