DESCRIPTION OF PRINCIPAL STAGES. 



21 



WINTER EGG. 



The winter eggs, especially in the vicinity of Washington, D. C, 

 are generally deposited during the first half of October, in cracks 

 and under loose bark of the trunks of silver or soft maples, where they 

 are embedded in delicate white wool. They are highly polished and 

 at first of an orange color, with a greenish-gray central spot, though 

 they change gradually to a blackish green. They are elongate-oval 

 and almost twice as long as wide. Their length is about 0.7 mm., 

 and the diameter 0.4 mm. 



ASEXUAL GENERATIONS. 



COLONY ON LEAF OF MAPLE. 



As had been stated before, it has been demonstrated that the in- 

 fested leaves on maple trees 

 exhibit a more or less distinct 

 tendency to fold or to double 

 downward, so as to protect 

 the insects within this fold, in 

 which frequently there is a 

 large and closely packed 

 colony of aphides, covered 

 with a cottony secretion which 

 gives the entire mass a re- 

 semblance to a large white- 

 haired caterpillar. 



YOUNG STEM-MOTHER. 



The general color of the 

 young stem-mother is a dull 

 blackish or brownish green, 

 the head being darkest. The 

 eyes are black and the antennre 

 and legs dusky. The insects 

 are covered with a delicate 

 bluish-white secretion, and ornamented with four dorsal and a lateral 

 row each side of whitish cottony knobs. The antenna) are 4- 

 jointed and do not reach to the mesothorax; the two basal joints are 

 shortest; joints 3 and 4 are longest and subequal in length, each being 

 about as long as the two basal joints combined; the third is some- 

 what stoutest at the apex, while the fourth, including its short, 

 blunt spur, appears to be more or less distinctly fusiform. The ros- 

 trum is large, and reaches almost to the tip of the abdomen. Length 

 about 0.7 mm. 



Fig. 6. — Proviphiliis tessellata: Young stem- 

 mother and antenna. (Original.) 



