68 



The C. coriaceus of Mediterranean latitudes occurs, not unfre- 

 quently, at the Canaries ; though hitherto it has been observed only 

 in Grand Canary and Teneriffe. 



204. Colymbetes lanio. 



Dytiscus Lanio, Fab., Ent Syst. i. 190 (1792). 



Colymbetes Lowei, G. R. Gray, Griff. A. K. Ins. i. pi. 32. f. 2 (1830) 



Lanio, Aube, Hydrocanth. 221 (1838). 



f Woll, Ins. Mad. 82 (1854). 



, Id., Cat. Mad. Col. 24 (1857). 



Habitat Maderenses (Mad.), in rivulis parum vulgaris. 



This species would seem to be the Madeiran representative of the 

 C. coriaceus of the Canaries and southern Europe, which indeed it 

 greatly resembles. It is not uncommon in the streams of Madeira 

 proper, at intermediate and lofty elevations. 



Genus 52. AGABUS. 

 Leach, Zool. Miscell iii. 69, 72 (1817). 



205. Agabus bipustulatus. 



Dytiscus bipustulatus, Linn., Syst. Nat. ii. 667 (1767). 

 Agabus bipustulatus, Aube, Hydrocanth. 357 (1838). 



, Woll, Ins. Mad. 83 (1854). 



, Id., Cat. Mad. Col. 25 (1857). 



Habitat Maderenses (Mad.), in aquis praesertim fluentibus vulgaris. 



The common European A. bipustulatus is universal in Madeira 

 proper, occurring at nearly all elevations ; but it has not yet been 

 detected in any other of these Atlantic islands. 



206. Agabus nebulosus. 



Dytiscus nebulosus, Forst., Nov. Spec. Ins. 56 (1771). 



bipunctatus, Fab., Mant. Ins. 190 (1787). 

 Colymbetes bipunctatus, Bridle, in Webb et Berth. (Col.) 58 (1838). 

 Agabus nebulosus, Woll., Ins. Mad. 84 (1854). 



1 id., Cat. Mad. Col. 25 (1857). 



, Id., Cat. Can. Col. 80 (1864). 



Habitat Maderenses (Mad., Chat}, Des.) et Canarienses (Can., Ten.), 

 hinc inde vulgaris. 



The A. nebulosus, so common throughout Europe, is locally abun- 

 dant in these Atlantic islands. It has been captured in Madeira 

 proper and the two northern Desertas, of the Madeiran Group, and 

 in Grand Canary and Teneriffe at the Canaries. 



