118 
PRELIMINARY LIST 
to black. Beak reaching second coxae. Abdomen plump and obtuse, dark dusky green, 
with a marginal row of dots and otherwise barred and mottled with black on dorsum and 
pleurum. Honey tubes cylindrical, slightly larger at base than at apex, length 0.20 mm 
Style conical. Tibiae and upper portion of tarsi white. Younger individuals of a pale 
reddish brown. Winged viviparous females: Length 2 mm. Length of wing 2.90 mm. 
Length of antennae about 1 mm., joint III 0.25-0.32 mm., IV 0.15-0.16 mm., V 0.15-0.16 mm., 
VI 0.12-0.13 mm., VII 0.23-0.27 mm. Head, thorax, and greater part of appendages 
brownish black. Third joint of antennae with an irregular row of about ten sensoria, 
fourth joint with fewer sensoria. Lateral tubercles of prothorax sometimes barely 
apparent. Wings rather broad, second branch of cubital nearer tip of wing than to base 
of first branch. Abdomen rounded and plump, pale yellowish brown, with small spots of 
black on dorsum and a row of three larger round black spots on each pleurum. Honey 
tubes about 0.18 mm. long, cylindrical, broadening at base. Style short conical, acute. 
Tibiae and upper portion of beak white.” 
Hotchkiss, Delta County, July 13th in large colonies on 
the petioles of horse-radish (Cowen). 
Aphis asclepiaclis Fitch. 
Hotchkiss, Delta County, August 1st in small colonies on 
under side of leaves of Asclepias speciosa (Cowen.) 
Aphis bakeri Cowen n. sp. 
‘‘Winged viviparous female: Length 1.80 mm., to tip of wings 3.30 mm. Antennae with 
all the joints annulated, third and fourth joints strongly tuberculate and with numerous 
sensoria, joint III 0.27 to 0.32 mm., IV 0.16 mm,, V 0.14 to 0.16 mm., VI 0.10 mm. A frontal 
prominence between the antennae. Head and thorax black, venter green, dorsum darker, 
appendages dark. Venation of wings normal, second branch of cubital midway, stigmatal 
curved throughout. Honey tubes short, 0.09 mm. long, and 0.045 mm, thick at the some¬ 
what swollen lower third. Style 0.08 mm., long, conical. 
Apterous female: Length 1.7 to 2 mm. Some of the smaller individuals are of a rusty 
color. It resembles Aphis marutea Oestl.” 
Fort Collins, June 20tli, on stems of Trifolium pratense in 
large colonies (Cowen). 
Aphis brassicae L. 
Custer County, midalpine, on cabbage (Cockerell, 10). 
Abundant on cabbage wherever cultivated. Specimens 
from Hotchkiss, Delta County, differ in being lighter in 
color (Cowen). 
Aphis cephalicola Cowen n. sp. 
‘‘Winged viviparous female: Length 1.70 mm., to tip of wings 3.60 mm. Head, antennae, 
joints of legs, thorax, spots on abdomen, and honey tubes, dark. A large quadrangular 
gray to green spot on dorsum. Back part of pronotum and most of abdomen yellowish. 
Third joint of antennae tuberculate with numerous irregular sensoria, fourth with few 
irregular sensoria, all joints strongly imbricated, joints III 0.33 mm., IV 0.14 mm., V 0.12 
mm., VI 0.11 mm., VII 0.24 mm. Beak hardly reaching second coxae. Thorax arched, 
lateral tubercle present. Second branch of cubital midway. Honey tubes 0.10 mm. 
Style about 0.06 mm. Tarsi 0.10 mm.” 
Fort Collins, June 30th, usually solitary in heads of 
Trifolium repens (Cowen). 
