144 BRITISH APHIDES. 



band. Cornicles cylindrical, nearly three times longer 

 than thick. Cauda small, not projecting beyond the 

 anal plate. Legs pale brown and hairy. Rostrum 

 reaches beyond the third coxa. AVings somewhat 

 peculiar in form ; long, pointed, and slightly incised or 

 incurved inwards, as to the costal and subapical mar- 

 gins. This character has suggested a name for the 

 genus. The cubital and other veins, and also the 

 stigmata, pale brown. 



The rostrum of the young is much longer than that 

 of the adult, and nearly equals the length of the body. 



In the month of August Mr. Knaggs was good 

 enough to forward to me, from his garden at Kentish 

 Town, several willow twigs which were crowded with 

 specimens of Melaiwxanthns salicis. Amongst these 

 black and orange-coloured insects numerous examples 

 of the Aphis now under description were intermixed, 

 and these were indiscriminately feeding together on 

 the green bark of the same twigs. This amicable 

 intermingling of different genera is somewhat remark- 

 able, but is not confined to these two species. 



Genus XIV. CRYPTOSIPHUM,* Biickton. 



Vertex convex. 



Antenna3 very short in the apterous, but longer in 

 the alate form. Seventh joint short, about once and 

 a half longer than the sixth. 



Rostrum moderate, reaches to the second coxa. 



Cornicles none, or represented by mere pores. 



Cauda small, but distinctly seen in the winged forms. 



Legs rather short. 



Wings short, rounded and veined like Aphis. 



The chief characters of this genus are the want of 

 cornicles and tail. In the length of the wings and the 

 rostrum it differs much from Hijalojjterus. 



* Frjm Ki)^vTrTug, Inddeu, and ai<pwu. 



