1918] Baker—Another Toxoptera Feeding on Sedge (Homoptera; Aphidide) 91 
Male. 
The males of this species appeared in the breeding cages dur- 
ing the early part of November and remained in considerable 
numbers until cold weather put a check to their activities. In 
connection with these males a reference to those of muhlenbergie 
Davis will be of interest. Davis (l.c.) described the males of that 
species as apterous and gavean excellent figure. Baker and Turner! 
in referring to the male stated their belief that the individuals were 
intermediates. The structure of the thorax and the ocelli are well 
shown in the figure. Males of the present species indicate that 
this view is correct. Several specimens, evidently indicating the 
normal condition of the male, resemble the condition met with in 
the males of muhlenbergie. They possess more or less of the tho- 
racic structure of the alate form and also the head, while the wings 
are entirely absent. Other specimens, however, are more distinctly 
intermediate in nature, haying small pad-like structures repre- 
senting the wings. One specimen was obtained in which fully 
formed wings were present. The entire life cycle as observed at 
Falls Church is spent upon the sedge and the eggs are laid upon 
these plants in the fall. The presence of alate forms in the vivipa- 
rous generations and more particularly this peculiar intermediate 
- condition of the males would seem to indicate that this habit of 
remaining upon the one host has not been of very long duration in 
this species. No truly apterous males have been observed and 
it appears from the intermediate nature of the wingless males that 
the species has not yet developed to the condition in which truly 
apterous males may be found. For the sake of convenience the 
wingless males will be called apterous though they still retain 
the muscles of flight and other related alar structures. 
Apterous male: General color deep brownish black, the abdomen 
somewhat paler than the rest of the body, base of the femora and 
most of the tibiz yellowish. Cornicles, anal and genital plates 
black. 
Antenne with the following measurements: Segment III, 0.384 
mm.; IV, 0.192 mm.; V, 0.192 mm.; VI (0.08++0.4 mm.); Segment 
III, with 12 or 13 small circular sensoria in an uneven row, 
Segment IV with about the same number and Segment V with 9 
1Proc. Ent. Soc. Washington, vol. 18, p. 10-14. 
