20 



LIFE HISTORY OF THE ALDER BLIGHT APHIS. 



thorax; they are 5-jointed; joint 3 is shortest and joint 5 longest, or 

 about as long as joints 3 and 4 combined; joints 1, 2, and 4 are some- 

 what longer than 3, but shorter than 5, and subequal in length. All 

 of the tarsi of both sexes are provided with short, capitate digitules. 

 Length, about 1.2 mm. 



Fig. 5.—Prociphilus tessellata: Colony on leaf of maple. 



(Original.) 



MALE. 



The male is of a more or less greenish color, with its antennae and 

 legs somewhat dusky. It is rather small and about one-third or less 

 the size of the female. The antenna are about as long as those of the 

 female, though stouter, while the proportion of the length of the 

 various joints is the same in both sexes. Length, about 0.8 mm. 



