DYTISCID^E. 69 



207. Agabus biguttatus. 



T Dytiscus biguttatus, Oliv., Ent. iii. 40. 26, pi. 4, f. 36 (1795). 

 Agabus biguttatus, Aube, Hydrocanth. 341 (1838). 

 Colymbetes biguttatus ?, Brultt, in Webb et Berth. (Col.} 58 (1838). 

 Agabus biguttatus, Woll, Cat. Can. Col. 81 (1864). 



Habitat Canarienses (Can.}, in aquis minus frequens. 



I am not altogether satisfied that the present Agabus is truly 

 distinct from the following one ; nevertheless if further material should 

 prove that the small (and not very important) features which ap- 

 peared to me (when I compiled my Canarian Catalogue) to separate 

 it from that species are constant ones, it will follow that the A. bi- 

 yuttatus of southern Europe has been observed hitherto only in Grand 

 Canary, of all these Atlantic islands. But if, on the other hand, we 

 are compelled ultimately to regard it as identical with the consan- 

 guineus, the insect will then be seen to be pretty generally distributed 

 throughout the Canarian archipelago. 



208. Agabus consanguineus. 

 Agabus consanguineus, Woll., Cat. Can. Col. 81 (1864). 



Habitat Canarienses (Ten., Gom., Palma), in intermediis aquas 

 fluentes colens. 



A locally abundant Agabus in the streams of intermediate eleva- 

 tions in TenerifFe, Gomera, and Palma (in the second of which it has 

 been captured in profusion by the Messrs. Crotch, during their late 

 Canarian campaign). As already stated, it may perhaps prove ulti- 

 mately to be conspecific with the preceding one ; in which case 

 (whether it be the true biguttatus of Olivier, or not) the insect will 

 be perceived to have a still wider range throughout the Canarian 

 Group. 



209. Agabus maderensis. 



Agabus Maderensis, WolL, Ins. Mad. 85 (1854). 

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



Habitat Maderenses (Mad.), in aquis praesertim editioribus passim. 



Apparently peculiar to Madeira proper, where it occurs (here and 

 there in tolerable abundance) in the streams of intermediate and 

 lofty elevations. 



Genus 53. CYBISTER. 



Curtis, Brit. Ent. iv. 151 (1827). 



