428 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 8 



mm. Expanse of wings, 7.00 mm. Hind tibia 1.64 mm. Cornicles, .30 mm. 

 Cauda, .19 mm. Beak, .56 mm. Antenna III, .58 mm.; IV, .37 mm.; V, .365; VI, 

 .125 mm. Filament, .81 mm. 



The newly-hatched young are pale yellow. ' 



Oviparous female. — Wingless, general color Hght red. Legs and cornicles dusky 

 yellowish-gray. Cauda pale yellowish-gray, shaped as in viviparous forms. Antennae 

 dusky gray, joints I and II and base of III pale yellow, on slightly gibbous frontal 

 tubercles. Joint I sUghtly gibbous on inner surface. Eyes dark red. Body sparsely 

 armed with short pale hairs. Anal plate rounded, hairy. Hind tibiae somewhat 

 swoUen for then- basal two-fifths and bearing in that portion numerous small circular 

 sensoria. Cornicles imbricate. Sensoria of antennse circular tuberculate, about 

 20 on III, 4 to 11 on IV, usual apical on V. While the female is egg-laying she be- 

 comes darker in color and old examples are quite reddish-brown hke the apterous 

 vivipara. Measurements: Length, 1.56 mm. to 2.04 mm. Max, width (3d abd. seg.), 

 .93 mm. Hind tibia, 1.28 mm. Cornicles, .31 mm. Cauda, .17 mm. Beak, .545 

 mm. Antennae III, .35 mm. to .43 mm., IV, .21 mm. to .29 mm.; V, .215 mm. to .245 

 mm.; VI, .07 mm. to .12 mm. Filament, .533 to .763 mm. (The measurements for 

 length of body and antennal joints give variation between largest and smallest 

 examples; the other measurements are averages.) 



The 'Svinter" eggs I have found laid on the flower-stalks of Heuchera 

 hartwegii Dougl. They are at first pale yellow, later becoming jet 

 black, shining. They were being deposited May 25, 1914. 



Male. — Winged, general color variable, dark reddish-brown to dark gi'een. Much 

 black is on the disk of the abdomen. Head, thorax and antennae (except base of III) 

 black. Legs with more pale color than in the winged vivipara. Otherwise like the 

 winged female but smaller. Antennae on somewhat gibbous frontal tubercles, much 

 longer than the body, filament relatively longer than in the other forms. As in the 

 winged female, the second fork of third discoidal vein is slightly nearer to the apex of 

 the wing than to the first fork. All tibiae slightly enlarged apically. Sensoria 

 circular tuberculate, 27 to 38 on III, 12 to 19 on IV, 9 to 13 on V. Beak reaches 

 second coxae. Measm-ements : Length, 1.55 mm. Max. width (thorax), .55 mm. 

 Expanse of wings, 5.52 mm. Hind tibia, 1.44 mm. Cornicles, .22 mm. to .27 mm. 

 Cauda, .125 mm, to .156 mm. Beak, .564 mm. Antennae III, .48 mm. to ,61 mm.; 

 IV, .34 mm. to .38 mm. ; V, .37 mm. to .385 mm. ; VI, .12 mm. to .14 mm. Filament, 

 .85 mm. to .94 mm. (first four measurements average of 4 individuals). 



A rather small, long-legged, dark-colored species frequenting the 

 flower stalks of Heuchera hartwegii Dougl. All forms were taken May 

 25, 1914, at Redwood Canyon near Walnut Creek, Cal. Thomas took 

 this species at Sauk City^ Wisconsin, on Heuchera hispida. 



Explanation of Plates 26, 27 



1-3. Thecdbius populicaulis . 1. Male (ventral view). 2. Sexed female (ventral 

 view). 3. Sexupara, antenna. 



4. Prociphilus fraxini-dipetalce; Sexupara, antenna. 



5-7. Eucer aphis gillettei; alate viviparous female. 5. Antenna, 6. Cornicle 

 (showing variation) . 7. Cauda and anal plate. 

 8-10. Eucallipterus fiavus. 8. Alate viviparous female, cauda and anal plate. 



