CANARIAN COLEOPTERA. 89 



and with the crenulations more distinct, its colour is of a deeper 

 brown, and its limbs are a trifle shorter and more robust. Hitherto 

 I have only observed it beneath stones in the little stream which flows 

 through the wood of the Agua Garcia, of Tenerifte, — where, however, 

 it is tolerably abundant. 



143. Hydrsena quadricollis, n. sp. 



H. elongato-ovata, angustula, subtestaceo-fusca, subnitida ; capite 

 prothoraceque punctatis, illo nigrescente, hoc in disco paulo obscu- 

 riore, subquadrato, postice vix angustiore, ad latera (oculo fortis- 

 simo armato) vix serratulo ; elytris subovalibus, leviter sed crebre 

 striato-punctatis (punctis parvis) ; antennis ad basin, palpis pedi- 

 busque gracilibus, testaceis. — Long. corp. lin. vix |. 



Habitat Teneriffam, prope urbem Sanctam Crucem reperta. 



As has been already implied, the present Hydraina may be at once 

 recognized from the last species by its smaller size, narrower outline, 

 paler and much less deei)ly sculptured surface, by its prothorax being 

 suhquadmte (or but very slightly narrowed behind) and with the 

 lateral serrations excessively minute, and by its limbs being slenderer 

 and of a more pallid hue. The only spot in which I have observed 

 it is near S'" Cruz of Teneriife, — where I have several times taken 

 it, though very sparingly, amongst weeds in the small pools of the 

 Barranco Santo. 



Fam. 6. HYDROPHILID^. 



Genus 52. LIMNEBIUS. 



Leacli, Zool. Miscall, iii. 93 (1817). 



144. Limnebius gracilipes, n. sp. 



L. ovalis (antice et postice subsequaliter rotundatus), ater, subcon- 

 vexus, subtiliter et parce pubescens ; prothoraee (oculo fortiter 

 armato) minute punctulato, versus angulos posticos obscure dilu- 

 tiore ; elytris fore impunctatis, ad apicem fere concoloribus ; an- 

 tennis, palpis pedibusque gracilibus, piceo-ferrugineis. — Long. corp. 

 Hn. |-|. 



Habitat in rivuLis Canarige, Teneriifse, Gomerae et Palmse, hinc inde 

 baud infrequens. 



Easily recognized from the following species by its oval outline 

 (being almost equally rounded before and behind), considerably 

 blacker, less convex, less pubescent and very much more lightly 

 punctiu-ed surface, and by its slenderer limbs. I have taken it in the 

 stream at Mogan, in the south-west of Grand Canary ; in the vicinity 



