On Aquatic Carnivorous Coleoptera or Dytiscide. 821 
I. 17—Genus HYDROVATUS. 
Coxal excision longer in the longitudinal than in the transverse direction ; labrum 
visibly exserted ; length not exceeding 5m.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. 23-23, lat. 13 m.m. 
Mas, nitidus, clypeo medio leviter producto et truncato, utrinque obsolete sinuato; 
antennis crassis. 
Fem., subopaca, clypeo rotundato, antennis sat crassis. 
Antennz 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 distincuished by the difference of the antennee and the sexual characters, 
by its less distinct punctuation on the upper surface, and the much less closely and 
regularly punctured coxe. 
Europe. South of England, (Portsmouth), France, (Rouen, Bourgogne, Landes), Algeria, Corsica, (Porto 
Vecchio, Reveliére), Sardinia. 1. 
180. Hyphydrus cuspidatus, Kunze, Oxynoptilus cuspidatus, M.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. 22-3, lat. 13 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 assigned :— 
Hydroporus carbonarius, Clk. (No. 1,349 huj. op.); Java. Hydroporus orientalis, Clk. (No. 1,411), 
near No. 200; China. Hydroporus portmanni, Clk. (No. 1,418); Mexico. Hydroporus pudicus, Clk. 
(No. 1,422), near No. 192; Java. Hydrovatus ferrugatus, Regt. (No. 1,450); Manilla. Hydrovatus 
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 punctipennis, 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. 
