iqoq] Studies on Aphididae II 41 



VII, fig 40) Style black, conical, an sliglitly longer than the hind tarsus. 

 (PI. VII, fig. 41.)' 



]\Ieasurements [from specimens in balsam]: — Length of body, 1.50-1.97 

 mm.; width, 0.70-1.14 mm.; length of wing, 2. .'57 mm.; width, 0.90 mm.; 

 expanse, approx. 5.25 mm.; antenna. I, 0.0G5; II, O.OB; III, 0.30-0.34, av. 0.31; 

 IV, 0.195-0.235, av. 0.22; V, 0.195-0.22, av. 0.205; VI, base, 0.095-0.115, av. 

 0.105; VI, filament, 0.29-0.365, av. 0.34; average total, l.;')05 mm.; cornicles, 

 0.23 mm.; style, 0.15 mm.; hind tarsus, 0.135 mm. 



Wingless viviparous female: — Entire body pulverulent. Head dark red- 

 dish brown. Antenna; blackish, comparative lengths similar to those of the 

 winged viviparous female, the usual sensoria at distal ends of V and base VI. 

 (PI. VII, fig. 42.) Eyes blackish. Thorax concolorous with head. Legs pale 

 brownish, distal third of the femora, end of tibiae, and the tarsi black. Abdo- 

 men brownish red, with a dusky marking at base of each cornicle which some- 

 times extends across the abdomen. Cornicles and style blackish. 



Measurements [from specimens in balsam]: — Length of body, 1.29 (shriveled 

 — 1.79 mm.; width, 0.68 (shriveled) — 1.00 mm.; antenna, averages, I, 0.065; 



II, 0.06; III, 0.30; IV, 0.20; V, 0.17; VI, base, 0.10; VI, filament, 0.33; average 

 total, 1.22 mm.; cornicles, 0.21 mm.; hind tarsus, 0.14 mm. 



Wingless oviparous female: — Entire body more or less covered with a 

 whitish pulverulence which is densest at the posterior end. In most specimens 

 the pulverulence appears more distinct in four longitudinal rows of short trans- 

 verse areas on the dorsum. Head blackish or blackish brown, darker than the 

 thorax and abdomen. Antennae with segments I and II dusky; III pale brown- 

 ish, IV darker, V and VI blackish; about one half the length of the body. III 

 about one fourth longer than IV, IV and V subequal, VI the longest, it being 

 nearly twice as long as III, base VI about one third shorter than V, filament VI 

 subequal to IV and V combined ; the usual sensoria at distal ends of V and base 

 VI. (PI. VII, fig. 43.) Eyes black. Thorax reddish brown to blackish brown. 

 Legs brown, excepting distal ends of the femora and tibi;c, and the tarsi, which 

 are blackish; hind tibitc much swollen almost their entire lengths and each bear- 

 ing approximately 80 more or less circular sensoria. (PI. VII, fig. 44.) Abdomen 

 concolorous with thorax and with a small blackish area at base of each cornicle ; 

 and fleshy tubercles along the sides as on the winged viviparous female. Cor- 

 nicles black and nearly one and one half times the length of the hind tarsi. 

 Style blackish and subequal in length to the hind tarsus. 



Measurements [from specimens in balsam and alcohol] : — Length of body, 

 1.79-1.97 mm.; width, 0.93-1.00 mm.; antenna, averages, I, 0.05; II, 0.05: III, 

 0.20; IV, 0.165; V, 0.16; VI, base, 0.10; VI, filament, 0.27; average total, 0.995 

 mm. ; cornicles, 0.19 mm. ; style, 0.14 mm. ; hind tarsus, 0.14 mm. 



Winged male: — Readily distinguished from the viviparous female by its 

 smaller size and the presence of several sensoria on segment V of the antenna. 



Head black and similar in shape to those of the other forms. Antennae 

 black; 14-18 circular sensoria irregularly placed on III, 9-12 on IV, 4-7 and the 

 larger distal one on V, and the usual one, with several smaller ones bordering 

 it, at distal end of base VI; about one half the length of the body. III one third 

 to one fourth longer than IV, IV and V subequal, VI about twice the length of 



III, base VI one third shorter than V, filament VI about twice V. (PI. VII, fig. 

 45.) Eyes blackish. Thorax black. Wings hyaline, the first and second dis- 

 coidals branching at two fifths to one third the distance from the margin to 

 where the third discoidal branches. Legs blackish excepting the basal halves 

 of the femora. Abdomen brownish to reddish brown, a dusky to blackish patch 

 at the base of each cornicle. Cornicles and style black. 



Measurements [from specimens in balsam and alcohol]: — -Length of body, 

 1.18-1.50 mm.; width, 0.465-0.54 mm.; length of wing, 1.97 mm,; width, 0.70 

 mm. ; expanse, approx., 4.50 mm. ; antenna, averages, I, 0.05; II, 0.05- III, 0.21 ; 



IV, 0.155; V, 0.15; VI, base, 0.10; VI, filament, 0.29; average total, 1.005 mm. ; 

 cornicles, 0.12 mm. ; style, 0.10 mm. ; hind tarsus, 0.13 mm. 



Egg: — Yellowish brown when first laid, changing to jet black within a day 

 or so; elliptical-oval in shape, and measuring 0.31 mm. in width and 0.64 mm. 

 in length. 



