1918] Baker—Another Toxoptera Feeding on Sedge (Homoptera; Aphidide) 89 
the second generation also. These forms are produced throughout 
the summer in the different generations, but toward fall they ap- 
pear in very small numbers and when the sexes are appearing very 
few alate forms can be found. The alate forms either reproduce 
upon the plant on which they developed or fly to other plants of 
the same species. 
Fourth instar (pupa). General color brownish black, the thorax 
somewhat pinkish or whitish brown, otherwise colored as in the 
apterous form. Antenne with the following measurements: Seg- 
ment ITT, 0.208 mm. ; IV, 0.16 mm.; V,0.16 mm.; VI (0.08+0.4mm.); 
cornicles 0.192 mm.; antennal tubercles quite acute in front and 
armed with short stout spines; vertex similarly armed. 
When cleared of the body fluids the abdomen and most of the 
thorax appear to be almost transparent. The antenne, head, legs, 
wingpads and cauda are dusky and the cornicles dark brown. 
Fifth instar (adult). General color deep brownish or purplish 
black. Antenne somewhat lighter than the general body color. 
Abdomen and cauda sometimes of a dark greenish color. Corni- 
cles black, sub-cylindric, slightly constricted near the tip and dis- 
tinctly flanged. Legs with the base of the femora and most of the 
tibiz yellowish or whitish. Measurements and sensoria as given 
in Table I. 
TABLE I. MEASUREMENTS OF ANTENNA AND CORNICLES OF 
THE ALATE VIVIPARA. 
Sensoria} | _—_ |Sensoria| Sensoria 
Segment of aces of pees of e VI. | Corniel 
III. |Segment ah Segment ay Segment | ~ eee aap 
III. ; 1 : V. 
0.304 13 0.192 5 0.176 2 0.08 +0.4 0.24 
0.304 12 0.192 6 0.176 Q 0.09 +0.432 0.24 
0.288 13 0.192 5 0.192 2 0.096-++-0 .432 0.24 
0.304 10 0.208 7 0.208 2 0.08 +0.448 0.24 
0.304 9 0.192 6 0.192 4 0.096-++-0 .464 0.24 
0.304 11 0.192 7 0.176 1 0.08 +0.432 0. 24 
0.32 10 0.224 6 0.176 Q 0.08 +0.448 0.24 
0.288 13 0.192 6 0.176 3 0.096-+-0 .432 0.24 
0.288 13 0.208 7 0.176 3 0.096-+-0 .432 0.224 
0.304 9 0.192 4 0.192 3 0.08 +0.432 0.24 
