736 On Aquatic Carnworous Coleoptera or Dytiscide. 
butislessbroad behind: it standsabout equally near to that species and to the Dytiscus 
tripunctatus group of species: itis readily distinguished from D. reeselii by thelateral 
band of theelytrawhichissimilar to that of D. tripunctatusand by thesexual characters, 
the female having no swimmingciliz along the outer margin of the hind tarsi beneath, 
and the male having a largely developed sexual pubescence on the intermediate tarsi. 
From C. asiaticus (No. 1142), the species of the D. tripunctatus group to which it has 
the most resemblance on account of the colour of its undersurface, it is readily 
distinguished by the broader epipleure, and the different sexual characters; the 
anterior tarsi of the male being large, and the female having sexual sculpture on the 
thorax. 
I have seen only a single pair of this interesting species; the male was in 
Castlenau’s collection, labelled, “‘ Cybister tibialis, Reich. Madagascar”; the female 
is in M. de Bonvouloi’s collection and bore no other indication of locality than a 
blue ticket on the pin. I have no doubt that Madagascar is the habitat. 
Madagascar. 1081. 
1151. Cybister pectoralis, n. sp.—Robustus, ovalis, convexus, sat latus, parum 
nitidus, supra nigricans, capite anterius prothoraceque ad latera testaceis, elytris 
vitta marginali ad apicem angustissima ad basin lata (cum epipleuris) testacea ; 
subtus fusco-piceus, coxis posterioribus externe macula parva testacea, metasterno 
gibboso, laciniis impressis; pedibus quatuor anterioribus testaceis, posterioribus 
nigricantibus ;; elytris transversim rugosulis, epipleuris versus apicem latis. Long. 
23, lat. 18, alt. 85 m.m.. 
The male has the front tarsi rather large, but their pubescent area on the under- 
surface is small: the middle feet have the three basal joints furnished with very 
long sexual hairs, their claws are rather long, but slender: the female hag the 
basal portion of the elytra covered with dense short scratches, which extend about 
half way to the apex, but in their terminal portion are very obscure, the thorax is 
uearly covered with short deep scratches so densely placed as to render the surface 
rugose, but they do not extend to the head, and indeed leave even the anterior 
margin of the thorax (in front of the transverse series of punctures) smooth. 
This species is a most remarkable one, owing to the peculiar conformation of its 
undersurface ; the metasternum in front is swollen or gibbous, and the breast of a 
peculiar metallic colour along the middle; the curved series of punctures which 
runs parallel with the inner margin of the middle coxal cavities are peculiarly deep 
and coarse. 
I have seen only a pair of this species, the male I purchased from a dealer about 
twelve years ago with the locality India; the female was in the collection of M. 
Castlenau, labelled “‘ India, Deccan.” 
East India. 1082. 
