806 On A<iuatic Carnivorous Coleoptera or Dytiscidce. 



the disc convex, the anti^rior and posterior edges with transverse series of impressed dots, black, the 

 lateral margins obsoletely ferruginous ; elytra ovate, piceous, the sides paler, deeply punctate throughout : 

 body pitchy black beneath, punctate ; legs entii-ely ferruginous : antenna? ferniginous at the base, dusky 

 at the tip." 



" Probably synonymous with Hy. planus, var. b. of Gyllenlial, but the colour of the elytra is different, 

 and they apjjear more deeply punctate : the head is not black." 



Rare, Norwich and near London. 



This is usually considered to be the species I have called Hydroponis Gyllenhalli (No. 599), and the 

 Stephensian name is used in place of that just mentioned, but the identification is very doubtful ; at any 

 rate the size — 2^ lin. — given by Stephens cannot apply to No. 599. — D. S. 



1115. Ilydropoi-us piochardi, Regt., Ann. Soc. Fr., 1877, p. 350. Syria. 



" H. gi-iseo-striato de Geer affinis, sed statura major. Elongato-ovalis, depressiusculus, vLx nitidus, fere 

 glaber, infra omnino niger. Capite testaceo-ferrugiueo, latissime in vertice et inter ociilos nigro ; pro- 

 thorace rufo-tostaceo, antice sat late et postice anguste nigi'o-marginato, maculis duabus nigris obliquis a 

 basi separatis notato, subtiUssime punctulato, utrinque fovea Lncui'vata haud profunda impresso ; elytris 

 subtilissime reticulato-punctatis, pallido testaceis, ad scutellum nigiicantibus, sutura et lineis sex nigris 

 utrinque ornatis, prima ad suturam tcnuissima, quarta et quinta ad apicem confluentibus, sexta bis inter- 

 rupta et j^ost medium cum lineola externa confluente ; antennis pedibusque omnino testaceis. Long. 5 ^ 

 5^ m.m." Djebel-ech-cheik. 



This is succeeded, I.e., by a description in French, chiefly a translation of the above ; it is doiibtful 

 whether this is more than a variety of D. gi-iseo-striatus (No. 49.3). — D. S. 



1416. Hydi-oporus planatus, Mann., Bull. Mosc, 1853, III, p. 162. Russian North America. 



" Oblongo-ovalis, depressiusculus, dense punctulatus, griseo-pubescens, parum nitidus, niger ; thoracis 

 basi latitudine antica sesqui latiore, lateribus obliquis vix rotundis, elj-tris nigrobrunneis, posterius pone 

 medium versus apicem rotundatis, stria suturali utiinque leviter impressa ; anteimanim basi, occipitis 

 margine anguste pedibusque rufo-testaceis. Longit. 2 lin., latit. 1 lin." 



This has not been alluded to by Crotch either in the Check-list or " Revision of North American 

 DytiscidK."— D. S. 



1417. Hydroporus politus, Macl., Tr. N. S. "W., p. 124. Australia (Gayndah). 



" Length f of a line. This may probably not belong to the present genus. It is of an elongate convex 

 form almost acuminated at the apex of the elytra and very nitid on the entire surface. The head and 

 thorax are of a dark red ; the elytra are of a pitchy black ; the last six or seven joints of the antennse 

 seem moniliform." 



This description is of little value and I have no idea what it indicates. — D. S. 



1418. Hydroporus portmanni, Clk., Ann. Nat hist., 1862, p. 174. Mexico. 



" Subcircularis, latus, depressus, leviter punctatus ; thorace pene triangulari, flavo-feri-ugineo . 

 elytris flavis, ad suturam nigris; antennis pedibusque flavis. Long, corji. 1| Hn., lat. ^ — 1 lin," 



" Broad and depi-essed, glabrous, under a high power very finely punctate, in colour ferruginous or 

 flavo-feiTuginous : head broad, impunctate, black : thorax broadly transverse, much narrower laterally 

 than medially, the sides being very short ; the surface is anteriorily finely punctate, more distinctly so 

 towards the base ; in colour flavo-ferruginous, the anterior margin being more pale than the base ; the 

 form of the thorax is remai-kable ; it is subtriangular, by reason of its deep seuteUary angle and its 



