APHIDIVOROUS SYHrHID^. 117 



Found at Haslemere and at Brandon, near Norwich, 

 crowding within the capsules of Silene inflata. It 

 also forms curious distortions and bunches at the 

 summit of the plant, which, when opened, show an 

 abundance of loose woolly matter within. 



This Aphis appears in July and August. 



In several particulars it departs somewhat from the 

 type of Hyalopterus. 



Amongst the specimens of Aphides mounted by Mr. 

 Walker and submitted to me, I find an Aphis un- 

 named, which, from the fact that it was found feeding 

 on the cotton-grass, I have no doubt is the insect 

 described in MS. by Haliday, and afterwards by 

 Walker as Aphis eriophori. It appears to belong to 

 the genus Hyalopterus, and as it is somewhat marked 

 in form, I add it to this list of Aphides, although I 

 have not seen it alive, and therefore I cannot figure it. 



Hyalopterus eriophori, Haliday. 

 Aphis eriophori, Walk. 



Inch, 



Size of body . . . O'lOOx 0-040. 



Body hairy, long oval, lead-grey, with a white 

 floccus at the tip of the abdomen. Antennae about 

 two fifths of the length of the body. Cornicles mode- 

 rately long. Legs rather short. The winged form 

 unknown. 



Taken abundantly on Eriopliorum vagmatum, at 

 Sally Gap, Wicklow Mountains, Ireland, in August, at 

 more than 1600 feet above sea-level.* 



Aphidivorous Syrphid^. 



Although much has been written, and many schemes 

 have been recommended for the extermination of 

 Aphides from our crops, it is very certain that the 



* Vide ' Ann. Nat. Hist.,' series ii, p. 46, vol. ii. 



