THE CANADIAN ENTOMOLOGIST. 387 



and both together shorter than the third segment. Body somewhat 

 slender, whig venation regular. Nectaries are but wide raised bases, with 

 a flange at the opening, cauda slightly longer than broad, with a wide 

 elliptical tip. Body with many small tubercles, each one of which bears a 

 stout tapering bristle. At this time there is but a single American species 

 placed in this genus \Sipha flavus Forbes), which differs somewhat from 

 the above. Above description taken from European specimens of the 

 type species. 



Tribe Vacunini. 



There are but two species belonging to this group, and while closely 

 allied to one another, are separated from other groups by distinct charac- 

 ters. They are, however, distinct enough from each other to belong to 

 separate genera, and have accordingly been separated, and their characters 

 are very misleading. In general they seem to come closer to the Callip- 

 terus group, but the undeveloped antennae and eyes seem to place them 

 on a lower plane of organization. The apterous forms have dentate 

 processes on the sides of the abdomen, and with the bristle-like hairs must 

 belong close to Sipha, which seems to be the next step beyond. The 

 antennae are five-segmented, and not on antennal tubercles. The spur of 

 the fifth segment is but a short nail-like process, the wings are 

 undeveloped, and the nectaries are similar to Sipha. The apterous forms 

 have undeveloped eyes, composed of but three ocelli to each one, and the 

 ocelli are but red spots. 



The two genera are distinguished as follows : 



Cauda with a knob at the tip and longer than broad Glyphina. 



Cauda blunt, broader than long, 'and not constricted Vacntia. 



Glyphina Koch.'' 

 Syn. Thelexes Backton, p. "p. 



type A. alni Schrank. 

 Antennae five-segmented, and^shorter than one-half the length of the 

 body. Spur of fifth but a small thumb-like process. Third segment the 

 longest. Wings short and broad, veins heavy, and the median vein of the 

 fore wing but once forked. Hind wing , 'with 'but a single cross-vein. 

 Nectaries slightly raised and shaped as in Lachnus. Cauda short, broad 

 and rounded at the tip. Antennae, legs and body set with short fine 

 hairs. Apterous forms have numerous stout spicules, and the eyes are 

 rudimentary. 



7. Die Pflanzenlause Aphiden, p. 259, 1854. 



