76 HYDROPHILID.E. 



Grand Canary, Teneriffe, Gomera, and Palma. It is about the size 

 of the European L. nitidus ; but it is more oblong (being less acute 

 behind), blacker, less brilliant, and not quite so convex, its puncta- 

 tion is appreciably closer and stronger, and its prothorax is relatively 

 a little more developed and not quite so rounded at the sides. 



229. Limnobius grandicollis. 



Limnebius grandicollis, Woll., Ins. Mad. 94 (1854). 

 , Id., Cat. Mad. Col. 30 (1857). 



Habitat Maderenses (Mad.}, in aquis et aquosis editioribus occurrens. 



Peculiar to the higher districts of Madeira proper, where It ascends 

 to at least 5000 feet above the sea, occurring principally about wet 

 rocks and small trickling streams. It is a species which is well 

 distinguished by its coarsely alutaceous, remotely and minutely 

 punctulated, and finely pubescent surface, by its medially-broad 

 elliptic outline, and by its deep -black hue its lateral margins being 

 but very obscurely (often, indeed, not at all) diluted or subpicescent. 



230. Limnobius punctatus. 



Limnebius punctatus, WolL, Cat. Can. Col. 90 (1864). 



Habitat Canarienses (Ten., Gom.), aquas et aquosos in intermediis 

 colens. 



A Canarian Limnobius which occurs in the streams of intermediate 

 altitudes. I have taken it abundantly at the Agua Garcia in Tene- 

 riffe, and examples are now before me (differing a little from the 

 Teneriifan ones) which were captured by the Messrs. Crotch in Go- 

 mera. It is not only a trifle smaller and convexer than the Madeiran 

 grandicollis, but it is likewise much more shining (there being no 

 appearance of the alutaceous sculpture which is so conspicuous in 

 that insect); it is also rather more closely, and very much more 

 deeply, punctured, as well as more thickly clothed with a coarse 

 silken fulvescent pile ; its colour is less black its sides, particularly 

 of the prothorax and towards the apex of the elytra, being for the 

 most part brightly ferruginous ; and its feet are, if anything, some- 

 what shorter. 



The Gomeran examples appear to be altogether a little narrower 

 than the ordinary Teneriifan ones (particularly at the junction of 

 the prothorax and elytra) ; and their punctures, when viewed be- 

 neath the microscope, will be seen to be not quite so coarse. But I 



