120 
PRELIMINARY LIST 
Aphis gillettei Cowen n. sp. 
“Winged viviparous female: Length 1.70 mm. Antennal joints annulated, third joint 
tuberculate with numerous sensoria, joints III 0.84 to 0.36 mm., IV 0.18 to 0.23 mm., V o'.ll to 
0.12 mm., VII 0.28 to 0.30 mm. A frontal prominence between the antennae. Beak nearly 
reaching second co.xae, about 0.45 mm. long. Antennae, head, thorax, and greater portion 
of appendages black. Abdomen green, marked with transverse bars and with a mar^^inal 
row of dots of deeper green or black, shafts of legs light. Lataral tubercle of protjtum 
small. Imsertions of wings yellowish. Second branch of cubital nearer to apex than 
origin of first branch. Stigm i pointed. Honey tubes slightly enlarged at base, about 
0.35 mm. long. Style 0.12 mm. long. Tarsi 0.14 mm. Apterous viviparous female : 
Length l.ij mm. Antennae about 1.10 mm. long. Pale green except eyes, tarsi, and tips 
of honey tubes, which are black. Dorsum with patches of darker gr len. Body broad in 
proportion to the iength. Ilcney tubes about 0 33 mm. long, cylindrical. Style 0 12 mm.’’ 
Fort Collins, Jane 22d, on Helianthus petiolaris (Gillette). 
Hotchkiss, Delta County, July 24th, on Helianthus sp. in 
small colonies on the under side of the leaves (Cowen). 
dhe same species was found on the under side of leaves of 
Amarantus retroflexus, in colonies of one winged and two 
or three small young, at Hotchkiss, Delta County, July 26th 
(Cowen). 
Aphis heraclii Cowen n. sp. 
Winged viviparous female : Length 1.40 to 1.50 mm. Head and thorax black, abdo¬ 
men yellowish green with some deeper green spots on the dorsum, causing the whole 
abdomen to appear deep green. Beak nearly reaching third coxae, 0.50 mm. long. Third 
joint of antennae tuberculate and with numerous sm ill sensoria, all the joints annul¬ 
ated. the group of sensoria at apex of fifth joint conspicuously elevated, length of joints 
III 0.33 to 0.40 mm.. IV 0.21 to 0.23 mm., V. 0.1 J to 0.20 mm , VI 0.11, VII 0.27 to 0.31 mm. 
Thorax archel. lateral tubercle of promVum small. Second branch of cubital vein 
nearer to the apex o ' the wing than to the origin of the first branch. Legs light except 
at the joints, length of tarsi 0.14 mm. Honey tubes 0.26 mm. long. Style 0.10 mm.” 
Fort Collins, July 9th in colonies in the umbels of 
Heracleum lanatum. A somewhat larger form of apparently 
the same species was found in the umbels of Pastinaca 
sativa at Fort Collins, Julv 28th. 
Aphis niaidis Fitch. 
Fort Collins, September 14tli on maize (Baker). Hotch¬ 
kiss, July 27th on all parts of maize (Cowen). 
Aphis niali Fab. 
Hotchkiss, August 23d, colonies of aj)terous and winged 
individuals on young leaves and shoots of apple (Cowen). 
Fort Collins, on apple (Gillette). 
Aphis medicaginis Koch. 
Fort Collins, June 27th on Astragalus bisulcatus, prin- 
cipally in the racemes of flowers, and on Glycyrrhiza lepidota 
