On Aquatic Carnivorous Coleoptera or Dytiscida. 737 
Group 5, 
1152. Cybister wehnckianus, n. sp.—Minor, ovalis, fere angustus, parum nitidus, 
supra nigricans, capite anterius prothoraceque ad latera testaceis; elytris vitta 
submarginali angusta ante apicem ommnino obsoletescente testacea, epipleuris 
nigricantibus ; subtus piceus, coxis posterioribus externe vage testaceo-maculatis, 
metasterno anterius subprominulo, laciniis impressis, pedibus quatuor anterioribus 
testaceis, femoribus in medio tibiisque intermediis obscurioribus, pedibus posteriori- 
bus nigricantibus ; elytris transversim rugosulis, epipleuris versus apicem latis. 
Long. 20, lat. 11 m.m. 
I have not seen the male of this species ; the elytra has on the basal portion of 
the elytra rather numerous short irregular scratches, which do not reach either to 
the suture or lateral margin, and, becoming very obscure as they extend backwards, 
cease entirely about half way to the apex: the thorax is almost free from sexual 
sculpture, although its surface is uneven ; on careful examination however traces 
of excessively fine short scratches may be detected along its basal portion. 
This species seems ailied to the preceding one although very distinct therefrom ; 
the gibbosity of the anterior part of the metasternum is indistinct, but the coarse 
series of punctures, and the impressions on its lacinie are much the same; the 
colour of the epipleurze of itself renders the two species very distinct. 
India (2). 1083. 
1153. Cybister cephalotes, n. sp.—Ovalis, sat latus, anterius parum angustatus, 
capite majore ; supra olivaceus, capite anterius prothoraceque ad latera testaceis, 
elytris vitta integra determinata laterali cum epipleuris testaceis, his externe nigro- 
lineatis; subtus niger; pedibus anterioribus et intermediis rufis, nigro-variis, 
posterioribus nigricantibus; prothorace ad latera subimpresso. Long. 28, lat. 
14 m.m. 
The male has the front tarsi rather small, and their pubescent area is small ; on 
the middle tarsi the two intermediate joints bear moderately long sexual hairs, and 
there is a very slight development of sexual pubescence on the following joint : the 
female has a patch of peculiar sexual sculpture along the middle of the wing-case but 
not reaching the base ; this sculpture consists of very short, deep, punctiform im- 
pressions, mixed with which are some short angular or curved impressions and 
numerous fine punctures, but extends only over a small space and is widely 
separated both from the suture and lateral margin. 
This species is a peculiar one, bearing a considerable resemblance to Dytiscus 
tripunctatus (No. 1140), but has the head larger, and the thorax with a sort of 
impression along the side ; the form of the yellow band along the elytra is quite as 
in D. tripunctatus, but the epipleuree externally are margined with dark colour ; 
