463 On Aquatic Carnivorous Coleoptera or Dytiscide. 
and H. lutulentus, Lec. (Proc. Ac: Phil. 1855, p. 293), is stated by Crotch to be the 
same as H. tenebrosus, 
North America, (? British Columbia or California). 370. 
588. Hydroporus hirtellus, Lec., Ann. Lye. V, p. 208.—Ovalis, evidenter pubescens, 
minus nitidus, subtus nigricans, supra fusco-niger, capite anterius et in vertice 
prothoracisque lateribus vage rufescentibus, pedibus antennisque fusco-rufis, his 
basi rufo ; prothorace limbo erebre sed haud fortiter, disco sparsim subtiliter, punctato; 
elytris minus. nitidis, subtiliter punctatis; coxis posterioribus crebre sat fortiter 
punctatis ; abdomine evidenter sat crebre punctato. Long. 45, lat. 25 m.m. 
The only individual I have seen is a female, and the male might perhaps prove 
the species more allied to H. modestus (No. 627), than to the preceding species. 
The resemblance to the European Dytiscus planus (No. 575) is considerable, but the 
form is here narrower, and the punctuation considerably finer. 
A specimen of this species was named for me by Leconte ; otherwise I should not 
have recognized it from description. 
North America, (California). 369. 
589. Hydroporus astur, n. sp.—Ovalis, convexiusculus, nitidulus, fere sine 
pubescentia, abdomine pectoreque nigris, capite thoraceque rufescentibus, hoe basi 
apiceque fuscis, elytris testaceis, fortiter crebre punctatis, antennis pedibusque rufis, 
illis brevibus versus apicem infuscatis ; prothorace limbo erebre, medio indistinctius 
punctato; coxis posterioribus sat crebre punctatis, abdomine segmento apicali sparsim 
punctato apice haud punctato, subacuminato. Long. 33, lat. 1g m.m. 
I have seen but one individual of this very distinct species, which bears some 
resemblance to Hyphydrus marklini, (No. 396) ; it appears to be a female. 
Europe, (Posada de Valdeon, Cantabrian Mountains). 368. 
590. Hydroporus alticola, n. sp.—Ovalis, minus depressus, tenuiter pubescens, 
vix nitidus, sat crebre et fortiter punctatus, niger, antennarum basi fusco ; COXIS 
posterioribus crebre evidenter punctatis ; abdomine segmento apicali obsolete 
puactato, sed apice summo distincte punctato. Long. 32, lat. vix:2 m.m. 
‘The sexes are difficult to distinguish. The elytra in this species sometimes show 
ong or two pale spots, and some of these are occasionally diffused so as to much 
dilute the colour of the wing-cases. The species may be readily distinguished from 
Hydroporus nivalis, by its less elongate more convex form, its duller surface ana 
rather coarser, and more scantily punctured elytra, with the pubescence considerably 
less. 
Europe; Alps, and Eastern Pyrenees. (Macugnaga, Wal Bevero ; Albertville, Monte Viso, Pic de 
Carlite, Tyrol). (Sierra Nevada, Spain, a variety or distinct species). 367. 
