On Aqnaiic Carnivorous Coleoptera or Dytiscidce. 321 



I. 17.— Genus HYDROVATUS. 



Coxal excision longer in the longitudinal than in the transverse direction ; labrum 

 visibly exserted ; length not exceeding 5 m.m. Numerous species, of short convex 

 form, from various parts of the world.* 



179. Hydrovatus clypealis. Sharp, Pet. Nouv. II, p. 61.— Brevissimus, minus 

 dense et distincte punctatus, livide ferrugineus, coxis fortiter minus crebre punctatis. 

 Long. 2i-2j, lat. li m.m. 



Mas, nitidus, clypeo medio leviter producto ettruncato, utrinque obsolete sinuato ; 

 antennis crassis. 



Fern., subopaca, clypeo rotundato, antennis sat crassis. 



AntennEe short, joints 4-10 differing but little from one another, in the male 

 transverse, in the female about as long as broad. In the male the basal joints of 

 the front and middle tarsi are much dilated. 



This species is closely allied to Hyphydrus cuspidatus, but is rather smaller, and 

 is readily distinguisbed by the difference of the antenna? and the sexual characters, 

 by its less distinct punctuation on the upper surface, and the much less closely and 

 regularly jJunctured coxae. 



Europe. South of England, (Portsmouth), France, (Kouen, Bourgogne, Landes), Algeria, Corsica, (Porto 

 Yecchio, Reveliere), Sardinia. 1. 



180. Hyphydrus cuspidatus, Kunze, Oxijnoptilus cuspidatus, JI.C. — Brevis, 

 latus, rufescens, prothorace basi medio elytrisque obscurioribus, his fascia interrupta 

 subbasali sat distincta alteraque obsoleta pone medium rufescentibus, versus suturam 

 sat crebre et fortiter lateribus obsolete punctatis ; coxis posterioribus fortiter 

 crebreque punctatis. Long. 2|-3, lat. If m.m. 



The male of this species has the basal joint of the front and middle tarsi dilated. 



* To this genus the following species, unknown to me, should probably be assigiaed : — 

 Hydroporus carbonarius, Clk. (No. 1,349 huj. op.); Java. Hydroporus orientalis, Clk. (No. 1,411), 

 near No. 200; China. Hydroporus portmanui, Clk. (No. 1,418); Mexico. Hydroporus pudicus, Clk. 

 (No. 1,422), near No. 192; Java. Hydrovatus ferrugatus, Regt. (No. 1,450); Manilla. Hyih-ovatus 

 hornii. Crotch (No. 1,451), near No. 221 ; Texas. Hydrovatus maculatus, Motsch. (No. 1,452) ; India. 

 Hydrovatus obscurus, Motsch. (No, 1,453), near No. 193; Ceylon. Hydrovatus punctipeimis, Motsch. 

 (No. 1,454) ; India. Hydrovatus rufescens, Motsch. (No. 1,455) : India. Hydrovatus seminarius, 

 Motsch. (No. 1,456) ; India. Hydrovatus subrotundatus, Motsch. (No. 1,457) ; India. 



