806 On Aquatic Carnivorous Coleoptera or Dytiscide. 
the dise convex, the anterior 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 entirely ferruginous: antenne ferruginous at the base, dusky 
at the tip.” 
“Probably synonymous with Hy. planus, var. b. of Gyllenhal, but the colour of the elytra is different, 
and they appear more deeply punctate : the head is not black.” 
Rare, Norwich and near London. 
This is usually considered to be the species I have called Hydroporus 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. 8. 
1415. Hydroporus piochardi, Regt., Ann. Soc. Fr., 1877, p. 350. Syria. 
“ H. griseo-striato de Geer affinis, sed statura major. Elongato-ovalis, depressiusculus, vix nitidus, fere 
glaber, infra omnino niger. Capite testaceo-ferrugineo, latissime in vertice et inter oculos nigro ; pro- 
thorace rufo-testaceo, antice sat late et postice anguste nigro-marginato, maculis duabus nigris obliquis a 
basi separatis notato, subtilissime punctulato, utrinque fovea incurvata haud profunda impresso ; elytris 
subtilissime reticulato-punctatis, pallido testaceis, ad scutellum nigricantibus, sutura et lineis sex nigris 
utrinque ornatis, prima ad suturam tenuissima, quarta et quinta ad apicem confluentibus, sexta bis inter- 
rupta et post medium cum lineola externa confluente ; antennis pedibusque omnino testaceis. Long. 5 a4 
54 m.m.” Djebel-ech-cheik. 
This is succeeded, /.c., by a description in French, chiefly a translation of the above; it is doubtful 
whether this is more than a variety of D. griseo-striatus (No. 493).—D. 8. 
1416. Hydroporus planatus, Mann., Bull. Mosc., 1853, III, p. 162. Russian North America. 
“‘Qblongo-ovalis, depressiusculus, dense punctulatus, griseo-pubescens, parum nitidus, niger ; thoracis 
basi latitudine antica sesqui latiore, lateribus obliquis vix rotundis, elytris nigrobrunneis, posterius pone 
medium versus apicem rotundatis, stria suturali utrinque leviter impressa ; antennarum 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 
Dytiscide.”—D. S. 
1417. Hydroporus politus, Macl., Tr. N. 8. W., p. 124. Australia (Gayndah). 
“ Length # of a line. This may probably not belong tothe 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 antenne 
seem moniliform.” 
This description is of little value and I have no idea what it indicates.—D. 8S. 
1418. Hydroporus portmanni, Clk., Ann. Nat. hist., 1862, p. 174. Mexico. 
“‘Subcircularis, latus, depressus, leviter punctatus; thorace pene triangulari, flav o-ferrugineo , 
elytris flavis, ad suturam nigris ; antennis pedibusque flavis. Long. corp. 14 lin., lat. $—1 lin,” 
“Broad and depressed, glabrous, under a high power very finely punctate, in colour ferruginous or 
flavo-ferruginous : 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 remarkable ; it is subtriangular, by reason of its deep scutellary angle and its 
