18 PROCEEDINGS OF THE ACADEMY OF [Jan., 



attached by threads to the surface upon which the female rests, I have 

 had a female lay 9 eggs in 24 hours. 



The individuals of the first brood that are to become winged secrete 

 a conspicuous fringe of white wax threads about the borders of the 

 head and prothorax in the pupa stage (PI. IX, fig. D), which, with the 

 longer antenna*, readily separate them from the apterous form. 



Apterous Female (Pis. IX and X). — The length of laying individuals 

 varies between .5 and 1.2 mm,; the color is a rusty brown, rather light 

 over the abdomen and darker upon thorax and head where the color 

 may be a slaty brown. The antennae are minute, about .06 mm, long, 

 three-jointed, joints 1 and 2 short and cylindrical and about equal 

 in length, joint 3 distinctly longer than joints 1 or 2. Legs 

 small and weak, femora about twice as long as thick, tibiae equaling 

 femora in length, tarsus two-jointed, the first joint appearing as a 

 wedge-shaped piece wnth the broad end below ; three clear spots upon 

 either side of the head in the position for compound eyes which may 

 function as ocelli. The ivax glands (PI. IX, figs. A. B, C) upon the 

 dorsum of the adult seem quite constant and are arranged about as 

 follows : Upon the head and prothorax, which are so united as to appear 

 as one piece, there are, upon either side of the median line, a longi- 

 tudinal row of four glands and outside of these another row of three, 

 and still outside of these, and located near the posterior lateral angles of 

 the prothorax, are three more small gland areas. The mesothorax has 

 one transverse row of from eight to ten of these glands ; the metathorax 

 and first abdominal segment each have a transverse row of eight, but 

 those upon the abdominal segments are small over the middle dorsal 

 portion and may be largely missing; the second abdominal segment 

 lacks two or four of the middle glands, leaving a row of four or six, and 

 segments 3 and 4 usually have but four glands each, one upon 

 the lateral margin and one near it a little mesad, and the glands upon 

 the lateral margins are continued upon two or three succeeding seg- 

 ments. Upon the ventral surface there is a small gland near the base 

 ■of each antenna and one (which may be separated into two parts) in 

 front of each coxa. The marginal gland patches show upon the 

 ventral as well as upon the dorsal surface, and in some specimens small 

 glands may be detected upon the abdominal segments just inside the 

 spiracles (PL IX, fig. B). 



The eggs are light yellow in color and are entirely hidden from view 

 by the long wax threads secreted chiefly from the head and thorax of 

 the female; they vary little from .32 mm. long by .17 mm, in width, 

 and each egg is anchored from one end by a short thread. As the eggs 



