648 On Aquatic Carnivorous Coleoptera or Dytiscide. 
I. 67.—Genus PRODATICUS. 
Coxal lobes broad, their supra articular border rather narrow ; claws of hind feet 
nearly equal in length. 
The only species is found in western Asia. (Persia and North India). 
1005. Prodaticus pictus, n. sp.—Sat latus, parum convexus, nitidus, niger, capite 
anterius prothoraceque lateribus testaceis, vertice testaceo-bimaculato, elytris 
maculis decem conspicuis flavis, antennis (parum elongatis) pedibusque anterioribus 
rufis, pedibus posterioribus piceis: prothorace lateribus subrotundatis, angulis 
posterioribus obtusis ; tarsorum posticorum unguiculis fere sequalibus; elytrorum 
punctis seriatis conspicuis. Long. 15, lat. 83 m.m. 
The male has the undersurface of the front tarsi irregularly covered with palettes 
about thirty-six in number, there is no definite division of them into larger and 
smaller, but those in the middle of the heel are much larger than the marginal 
ones: the three basal joints of the intermediate tarsi are broad, and bear beneath 
very numerous small palettes quite irregularly placed, but with a rather broad 
uncovered line along the middle. The terminal two joints both on the front and 
middle feet are less elongate and slender than in the allied forms. 
The yellow marks on the elytra are very conspicuous ; they consist on each of an 
elongate mark on the shoulder, a very large basal spot near the scutellum, two 
large spots beyond the middle placed transversely, the inner one rather remote 
from the suture, and the outer quite separate from the hind margin, and a subapical 
spot, touching neither the suture nor the outer margin. 
I have seen only two individuals of this remarkable species, which cannot 
easily be confounded with any other; the form of its thorax suggests a likeness to 
Agabus. 
Northern India. 1000. 
I. 68.—Genus WY DATICUS. 
Coxal lobes but little developed in the transverse direction, but with broad and 
definite supra-articular border; inner claw of hind tarsus twice as long as the 
outer, . 
The species are very difficult to distinguish, I arrange them provisionally in 
three groups viz :— 
