4G3 On Aquatic Caruicorous Coleoptcra or Di/lisciJce. 



and H. lutulentus, Lee. (Proc. Ac. Phil. 1855, p. 293), is stated by Crotch to be the 

 same as H. tenebvosus. 



North America, ( 1. British Columbia or California). 370. 



588. Hydroporus hirtellus, Lee, Ann. Lye. V, p. 208. — Ovalis, evidenter pubescens, 

 minus nitidus, subtus nigricans, supra fusco-niger, capite anterius et in vert ice 

 prothoraeisque lateribus vage rufoscentibus, pedibus antennisque fusco-rufis, liis 

 basi rufo; prothorace hmbo crebre sed baud fortiter, disco sparsim subtihter, punetato; 

 elytris minus nitidis, subtihter j^unctatis ; coxis posterioribus crebre sat fortiter 

 punctatis ; abdomine evidenter sat crebre punetato. Long. 4*, Lat. 2h 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). 3G9. 



589. Hydroporus astur, n. sp. — Ovalis, convexiusculus, nitidulus, fere sine 

 pubescentia, abdomine pectoreque nigris, capite thoraceque rufescentibus, hoc basi 

 apiceque fuscis, elytris testaceis, fortiter crebre punctatis, antennis pedibusque rufis, 

 illis brevibus versus apieem infuscatis ; prothorace limbo crebre, medio indistinctius 

 punetato; coxis posterioribus sat crebre punctatis, abdomine segmento apicali sparsim 

 punetato apiee baud punetato, subacuminato. Long. 3^, lat. li m.m. 



I have seen but one individual of this v.^ry distinct species, which bears some 

 resemblance to Hyphydrus marklini, (No. 396) ; it appears to be a female. 



Europe, (Posada de Valdcon, Cantabrian Mountains). 368. 



590. Hydroporus alticola, n. sp.— Ovalis, minus depressus, tenuiter pubescens, 

 vix nitidus, sat crebre et for tiler jranctatus, niger, antennarum basi fusco ; coxis 

 posterioribus crebre evidenter punctatis ; abdomine segmento apicali obsolete 

 punetato, sed apiee summo distincte punetato. Long. 32, lat. vix 2 m.m. 



The sexes are difficult to distinguish. The elytra in this species sometimes show 

 01 li 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 and 

 rather coarser, and more scantily punctured elytra, with the pubescence considerably 

 less. 



Europe; Alps, and Eastern Pyrenees. (Macvgnaga, Val Eevero ; Albertville, Monte Viso, Pic de 

 Carlite, Tyrol). (Sierra Nevada, Spain, a variety or distinct species). 3G7. 



