70 CANAEIAN COLEOriERA. 



what scarce in these islands, — the only district in which I have my- 

 self captured it being the Eio Palmas of Fuerteventura. It has 

 however, more recently, been taken, by Dr. Crotch, near Hermigua, 

 in Gomera. 



117. Hydroporus geminus. 



Dytiscus g-eminus, Fab., Ent. Si/st. i. 199 (1792). 

 Hydroporus geminus, Steph., III. Brit. Ent. ii. 57 (1829). 

 , Aube, Hijdrocanth. 491 (1838). 



Habitat Fuerteventuram, in eistema quadam ad Rio Palmas captus. 



The Canarian specimens of this common European Hydroporus arc 

 a trifle smaller and less pubescent than the ordinary ones of more 

 northern latitudes, and their elytra are paler, — the dark portion 

 which usually occupies almost the entire surface being so reduced in 

 dimensions as to take the form of a large, postmedial, dentate fascia : 

 but there is no character, that I can detect, to warrant its separation 

 from the H. geminus. And I may further add that it was regarded 

 as conspecific with that insect by Dr. Schaum. It appears to be very 

 rare in these islands, the only spot in which I have hitherto observed 

 it being the Rio Palmas of Fuerteventura, — where, during April 1859, 

 I captured eight specimens from out of an old water-tank. 



118. Hydroporus minutissimus. 



Hydroporus minutissimus, Germ., Ins. Spec. Nov. 31 (1824). 



, Aube, Hydroamth. 493 (1838). 



trifasciatus, Woll, An7i. Nat. Hist, xviii. 453. pi. 9. f. 3 (1846). 



Habitat in aquis Canarioe, Teneriffse, Gomera^ et Palmae, minus £re- 

 quens. 



The H. minutissimus of central and (more particularly) -southern 

 Europe appears to occur sparingly in these islands. I have taken it 

 in the district of El Monte in Grand Canary, in the Barranco Santo 

 (near S*" Cruz) of TeneriiFe, and in the Barranco de San Juan (near 

 the Souces) of Palma ; and it was captured by Dr. Crotch near Her- 

 migua, in Gomera. 



119. Hydroporus delectus, n. sp. 



H. oblongus, minute punctulatus, tenuiter pubescens, niger ; protho- 

 race ad latera dilute testaceo et oblique subrecto ; elytris utrinque 

 lineis tribus latis interruptis testaceis postice valde abbreviatis or- 

 natis ; antennis ad basin pedibusque piceo-testaceis. — Long. corp. 

 lin. 1-1|. 



Habitat in Teneriffse aquis, rarissimus. 



Very closely aUied to the European H. Jlavipes, but I think never- 

 theless really distinct. It is a little smaller, narrower, and more ob- 



