881 TUK CAN AKIA.N EMOMOUOUleT. 



A SECOND TAPER ON THE CIENERA IN THE SUBFAMILY 



CAM.II'IERIN/K. 

 (Containing the tribes Pt(lkocommini, Chaitophokini and Vacuini.) 



hy h. v. wii,son, corvailis, or. 

 The iirst paper on the genera of this subfamily was publisheu iti ihe 

 September issue of the Canadian Entomolocisi, and contained only the 

 genera in the tribe Callipterini. The following generic descriptions are 

 given in detail from the type species of each genus. Necessarily some of 

 the characters thus given are specific 



I'ribe Pterocommini. 

 This tribe contains those species which in general resemble the 

 Lachnus group, and yet have more in common with the C/uiiiophorini. 

 Antennae variable in length, six segmented and not on antennal tubercles. 

 Wing venation as in Aphiditii, nectaries variable but larger and distinct 

 from those of the Chaitophorus group. Cauda short, thick and broadly 

 rounded as in Lachnus. Antennii', body and legs with numerous fine 

 short hairs, and the known species of this groui-' have a row of ^piracies 

 or dentate-like processes along the sides of the abdomen. Some species 

 have both. 



Key to Cenera. 



Nectaries swollen or vasiform Melanoxantlunum. 



Nectaries cylindrical rtiroconi'iux. 



Mdanoxantherium Schoutcdcn. ' 

 Syn. Melanoxanthui Hucklon (preoccupied). 

 A. Salicis Linn. 

 .■\ntennre six-segmented and longer than the body, spur of si.xih 

 segment longer than segment ; third segment the longest. Wing venation 

 regular, nectaries variable in length and size, but always vasiform or 

 clavate. Cauda short and broadly rounded, anal plate broadly rounded. 

 Body, legs and antennne with fine tubercles, each one bearing a fine hair. 

 rtoocomma Buckton.* 

 Syn. C/iii/obius Koch. 

 Aphioides Passerini. 

 Ariitaphis Kirkaldy. 



type pilosa Buckton. 

 Antennne six segmented, and al)')ut one half the length of the body, 

 spur of sixth segment longer than the segment ; third segment longer than 



I. Ann. Roljf. Knt. Sot., Vol. 45, p. ii.v 

 i. .Mono|(raph ol the Kritish Aphides, \ol. M, p. 14.?. 

 Dn-cmhcr. 1910 



