DESCRIPTION OF PRINCIPAL STAGES. 



23 



powder, which is most dense on the sternum. The antennae are rather 

 short and reach to or somewhat beyond the insertion of the front 

 wings; they are provided with only a few fine hairs on joints 3 to 5; 

 there are also 9 to 13 annulations on antennal joint 3, 3 to 5 on joints 

 4 and 5, and from 5 to 7 on joint 6, all of which annulations are more 

 or less indistinct. The tail and last abdominal segment are short 

 and semicircular, surrounded around the edge with slender fine hairs. 

 Nectaries or nectar-pores are absent. The venation of the wings is 

 similar to that of other pemphiginids. Expanse of wings about 12 

 mm. ; length of body about 4 mm. 



Fig. 8. — Prociphilus tessellata: Migrant and antenna. (Original.) 



APTEROUS FEMALE ON ALDER. 



The apterous females, as found on the stems of alder, are densely 

 covered with white woolly or cottony secretion, which gradually 

 covers a whole colony, though frequently hidden from view by a 

 covering of earth erected over them by Cremastog aster and other 

 ants. After having been denuded of their cottony secretion they 

 are found to be of a reddish or dark orange-brown color, with the 

 divisions between the abdominal segments much darker or almost 



