HYDROPHILID^. 75 



226. Hydraena serricollis. 



Hydraena sinuaticollis et serricollis, Wott., Cat. Can. Col. 87,88(1864). 



Habitat Canarienses (Ten., Gom.), in intermediis editioribusque vul- 

 garis. 



A Canarian Hydrceiiia, which is locally abundant in the streams of 

 intermediate and rather lofty altitudes. When searched for in the 

 proper situations, it will most probably be found to be widely spread 

 over the archipelago ; yet hitherto I have myself observed it only in 

 Teneriffe. It has, however, been captured, more recently, by the 

 Messrs. Crotch both in that island and Gomera. It varies a little, 

 in the greater or less exaggeration of its several characters ; and I 

 now perceive (from more satisfactory material) that the single 

 example which I described under the trivial name of sinuaticollis 

 cannot be regarded as more than a somewhat largely developed one 

 of our present species. That particular individual was taken by 

 Dr. Crotch at Ycod el Alto, in Teneriffe, during the spring of 1862 ; 

 and I have a series now before me which were captured lately, by 

 himself and his brother, at the same place. 



227. Hydrsena quadricollis. 



Hydraena quadricollis, Wott,, Cat. Can. Col 89 (1864). 



i Habitat Canarienses (Ten.), in inferioribus prope urbem Sanctam 

 Crucem parce capta. 



This minute Canarian Hydrcena I have observed hitherto only 

 near S ta Cruz, in Teneriffe ; and it would seem, consequently, to be 

 peculiar to the lower elevations. 



Fam. 6. HYDROPHILIRffi. 



Genus 62. LIMNOBIUS. 



Leach, Zool. Miscett. iii. 93 [script. Limnebius] (1817). 



228. Limnobius gracilipes. 

 Limnebius gracilipes, Wott., Cat. Can. Col. 89 (1864). 



Habitat Canarienses (Can., Ten., Gom., Palmd), in inferioribus in- 

 termediisque late diffusus. 



Widely spread over the Canarian Group, where it occurs in the 

 streams of low and intermediate altitudes. It has been taken in 



