/xJ PARNID/E. 



abundant in the Canarian Group. Hitherto however it has been 

 observed only in Grand Canary and Teneriffe. 



217. Gyrinus natator. 



Dytiscus natator, Linn., Fna Suec. 779 (1761). 

 Gyrinus natator, Aube, Hydrocanth. 664 (1838). 



-, Wott., Ins. Mad. 88 (1854). 

 , Id., Cat. Mad. Col. 27 (1857). : 



Habitat Maderenses (Mad.)*! olim a Dom. Heineken, M.D., semel 

 repertus ; forsan ex Europa introductus. 



I feel very doubtful whether this common European Gyrinus should 

 any longer be included in the fauna of these Atlantic islands, the 

 single specimen captured many years ago in Madeira proper by the 

 late Dr. Heineken embodying still the sole evidence on which its 

 claim for admission rests. As, however, it has been recognized 

 hitherto, I will not suppress it; though I must record my belief 

 that the insect does not oqeur in Madeira, and that the example 

 alluded to (if really taken there) was a mere accidental introduction 

 from more northern latitudes. 



Fam. 4. PARNIRffi. 



Genus 57. PARNUS. 

 Fabricius, Ent. Syst. i. 245 (1792). 



218. Parnus prolifericornis. 



Parnus prolifericornis, Fab., Ent. Syst. i. 245 (1792). 

 Wott., Ins. Mad. 90 (1854). 



1 Id., Cat. Mad. Col. 28 (1857). 



, Id., Cat. Can. Col. 85 (1864). 



Habitat Maderenses (Mad.) et Canarienses (Can., Ten., Gom., Palmd), 

 in aquosis vulgaris. 



This widely spread European insect is common in these Atlantic 

 islands, where in all probability it will be found to be nearly uni- 

 versal. It is abundant in wet places in Madeira proper ; and it has 

 been taken in Grand Canary, Teneriffe, Gomera, and Palma, of the 

 Canarian Group. It occurs likewise at the Azores. 



Fam. 5. HELOPHORIRE. 



Genus 58. HELOPHORUS. 

 Fabricius, Syst. Eleu. i, 277 (1801). 



