CANARIAN COLEOPTERA. 91 



imply that, if present at all, it must at any rate be scarce. In Lan- 

 zarote, Fuerteventura, and Gomera it was likewise captured by Mr. 

 Gray ; in TenerLffe by M. Hartung ; and in Tenerifte and Gomera by 

 Dr. Crotch. It seems to have a larger and a smaller state, between 

 which I have not as yet observed transitional links ; nevertheless 

 there is no differential character, that I can perceive, to warrant the 

 suspicion that they are specifically distinct. The examples from the 

 eastern islands of the archipelago are, on the average, of a paler hue 

 than those from the central and western ones, — which is precisely 

 analogous to the Porto- Santan specimens, as compared with those 

 from Madeira proper. 



Genus 54. PHILHYDEUS. 



Solier, Atm. de la Soc. Ent. de France, iii. 315 (1834). 



147. Philhydrus melanocephalus. 



Hydropliilus melanocephalus, OUi:, Ent. iii. 39. 14 (1795). 



, BrnlU, in Webb et Berth. (Col.) 58 (1838). 



Philhydrus melanocephalus, Woll, Ins. Mad. 98 (1854). 

 , Id., Cat. Mad. Col. 32 (1857). 



Habitat in aquis Lanzarota3, Fuerteventiu'se, Canariee, Teneriftse ct 

 Gomerse, sat vulgaris. 



As in the case of the last insect, the common Eiu'opean P. mela- 

 nocephalus is all but universal (probably indeed quite so) in these 

 islands. Hitherto, however, I have captured it only in Lanzarote, 

 Fuerteventura, Grand Canary, Tenerifi'e, and Gomera, — in the fii'st 

 two and last of which it was likewise fomid by Mr. Gray, and in the 

 last by Dr. Crotch. It abounds in the streams of Porto Santo ; and 

 the same two states (a paler and a darker one) which occur there 

 exist equally at the Canaries. 



Genus 55. BEROSUS. 



Leach, Zool. Miscell iii. 92 (1817). 



148. Berosus spinosus. 



Hydrophilus spinosus (Ster.), Schon., Syn. Ins. ii. 8 (1808). 

 Berosus spinosus, Ahr., Fna Ins. Europ. iii. f. 5 (1816). 



, Stejyh., III. Brit. Ent. v. 400 (1832). 



, Brulle, in Webb et Berth. (Col.) 59 (1838). 



Habitat? [testibus DD.Webb et Berth., in ins. Canariensibus: mihi 

 non obvius]. 



I have not myself observed this European Berosus at the Canaries ; 

 and I may add that, had it been found in Madeira, I certainly should 



