1896] 



MICROSCOPICAL JOURNAL. 



329 



the central portion, contrasting strongly witli the natural 

 reddish green of the uninjured bark. With the second 

 molt the females do not change materially. They retain 

 their yellow color. The sucking bristles are extremely 

 long, two or three times the length of the insect's body. 

 About twenty days from birth the male insect trans- 

 forms to the true pupa (tig. 5, c. d.) The true pupa is pale 

 yellow, sometimes purplish, darkest about the base of the 

 abdomen. The head, antennsB, legs, wing pads and style 

 are well formed, but almost colorless. The antennsB reach 

 as far back as the second pair of legs and are not curved 

 under, as formerly, but lie close to the sides of the body 



FIGURE 7. 

 AspiiHotiis pernicious : Adult male. 



with the ends free. The first pair of legs are held for- 

 ward, reaching slightly beyond the eyes, the middle fem- 

 ora projecting somewhat beyond the margin of the abdo- 

 men. The hind legs are inclined backward and reach to 

 the end of the body. Tlie style is rounded at tip, conical 

 and about as long as the posterior tibia?. 



At twenty-four to twenty-six days from birth, the male 

 matures and backs out from the rear end of its scale. 

 They issue chiefly at night. The mature male (fig. 7) 

 appears as a delicate two-winged fly with long feelers and 

 a single style projecting from the end of the body. The 



