322 On Aquatic Carnivorous Coleoptera or DytiscidcB. 



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, differs 

 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, rufotestaceus, prothorace 

 basi in medio elytrisque fuscis, his fortiter puiictatis, margine externo iasciisque 

 flaramulatis parum discretis, testaceis, coxis posterioribus fortiter crebreque punc- 

 tatis. Long. 3 lu.m., lat. If m.m. 



The species is very similar to Hyphydrus cuspidatus, but is considerably broader, 

 and the elytra are more coarsely jnmctured. The only individual 1 have seen has 

 the upper surface shining, and is probably a male ; its antennae 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. 2f, 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 antennas 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. MilUngen). 1121. 



] 83. Hydrovatus simplex, n. sp. — Brevissimus, sat latus, convexus, castaneus 

 vel piceus, sat nitidus ; elytris versus suturam sat crebre et ibrtiter, lateribus obsolete 

 jHinctatis ; coxis posterioribus fortiter crebreque punctatis. Long. 2i, lat. Is 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. 



