322 On Aquatic Carnivorous Coleoptera or Dytiscide. 
that of the middle foot more distinctly than that of the front one. The female is 
generally dull and not at all shining, while the male is shining, but individuals of 
the female occur similar in sculpture to the male. 
This species varies in colour, the spots on the elytra being sometimes distinct, 
while in other specimens they can scarcely be seen, and the upper surface becomes 
sometimes of a nearly unicolorous castaneous shade. It is possible that further 
specimens may show I have included more than one species under this name. 
A single female from Abyssinia, in the collection of the Genoa Museum, ditiers 
little from the European specimens, but I think a knowledge of the male would 
most likely show it to be a distinct species. 
Europe. (France, Belgium, Corsica, Sardinia, Germany, Dalmatia, Italy.) 2. 
181. Hydrovatus flammulatus, n. sp.—Brevis, latior, rufo-testaceus, prothorace 
basi in medio elytrisque fuscis, his fortiter punctatis, margine externo fasciisque 
flammulatis parum discretis, testaceis, coxis posterioribus fortiter crebreque punc- 
tatis. Long. 3 m.m., lat. 1¢ m.m. 
The species is very similar to Hyphydrus cuspidatus, but is considerably broader, 
and the elytra are more coarsely punctured. The only individual I have seen has 
the upper surface shining, and is probably a male; its antenne are more slender 
and a little longer, than in the corresponding sex of H. cuspidatus. The anterior 
tarsi do not appear to be dilated. 
South Africa, (Eastcourt, 27. 3. 1875). 1123. 
182. Hydrovatus maculatus, n. sp. —Brevis, latus, nitidus, rufo-testaceus, pro- 
thorace basi in medio elytrisque fuscis, his signaturis testaceis magnis parum 
discretis ; versus suturam sat crebre lateribus obsolete punctatis ; coxis posterioribus 
fortiter crebreque punctatis. Long. 24, lat. vix. 2 m.m. 
This species is excessively similar to such broadest specimens of Hyphydrus 
cuspidatus, (No. 180) as have the yellow spots on the elytra large and conspicuous ; 
it is however broader, and the male has the antenne slender. The four individuals 
before me are exactly similar to one another, all have the surface shining, and 
the basal joints of the front and middle tarsi appear to be without dilatation. 
Mesopotamia, (Dr. Millingen). 1124. 
183. Hydrovatus simplex, n. sp.—Brevissimus, sat latus, convexus, castaneus 
vel piceus, sat nitidus ; elytris versus suturam sat crebre et fortiter, lateribus obsolete 
punctatis ; coxis posterioribus fortiter crebreque punctatis. Long. 23, lat. 13 m.m. 
The male differs from the female by the basal joint of the middle tarsus being a 
little dilated ; the first joint of the front tarsus is also very slightly dilated. 
