122 
PRELIMINARY LIST 
Aphis veratri n. sp.* 
“Winged viviparous female: Length 2.20 mm. Length of wing 3.05 mm. Color black, 
the thorax somewhat lighter than the rest of the insect. Antennae about 1.35 mm. long, 
the third .joint with numerous rather large sensoria, fourth often with two or three 
sensoria, fifth and sixth with usual groups of sensoria at the distal ends, length of joints 
III 0.39 mm., IY 0.25 mm., V 0 22 mm., VI 0.14 mm., YII 0.29 mm. Beak about 0.60 mm. long 
and reaching to the second coxae. Lateral tubercle of the pronotum prominent. Stigma 
elongate, second branch of the cubital nearer the apex of the wing than to the base of the 
first branch. Tarsi 0.12 mm. long. Honey tubes cylindrical, 0.28 mm long. Style about 
0.12 mm. long. Wingless form very dark.” 
In south-west corner of North Park, July 22d very 
abundant on leaves of Veratrum californicum (Baker). This 
may be No. 895 of the Custer County List (see Cockerell 10). 
Aphis ynccae Cowen n. sp* 
Winged viviparous female; Length 2.20 mm. Head, thorax, and greater, part of 
femora, antennae and honey tubes, black; abdomen dull yellow with small black dots on 
dorsum and pleurum. Third joint of antennae with numerous small sensoria, length of 
joints III 0.42 mm., IV 0.25 mm. V 0.25 mm. V 0.23 mm., VI 0.15 mm., VII 0.30 mm. Beak 
black and nearly reaching the third coxae. Thorax strongly arched. Lateral tubercle of 
pronotum present. Second branch of cubital nearer the apex of the wing than to the 
origin of the first branch. Stigmatal vein curved for the first half and straight or 
recurved for the remainder of the distance. Tibiae white, tarsi dark. Style conical, 
hairy at the tip, aboet 0.15 mm. long. Wingless individuals from uniform dark green to 
reddish yellow in color. 
Fort Collins, July 9th on inflorescence and stems of Yucca 
angustifolia. 
This is probably the species found occurring on Yucca at 
Greeley by Riley (see Riley and Monell, 1). It is also 
perhaps the same species as that mentioned as Aphis 
yuccicola n. sp. by T. A. Williams in his “Host-Plant List.” 
Aphis sp* 
“Winged viviparous female: Length 1.60 mm. Length of wing 2.90 mm. Color pale 
Stigma short. Honey tubes short and broad, about 0.9j mm. long. Style acute and about 
as long as honey tubes. Apterous individuals with numerous black dots on the dorsum.” 
Fort Collins, September 20th on cultivated radish (Baker). 
This may be A. brassicae. 
Aphis sp.* 
“Winged viviparous female: Length 1.60 mm. Length of wing 2.70 mm. Pale brown. 
Veins robust. Honey tubes about 0.22 mm. long. Style slender conical, about 0.11 mm 
long. Apterous individuals dark brown. Length about 2 mm. Antennae 1.20 mm. long. 
Honey tubes 0.30 mm.” 
Fort Collins, August 6th, on cultivated radish (Baker). 
Hyalopteris arundinis Fab. 
_ ___^ ~ ^ very abundant on Phragmites com- 
*Measurements from alcoholic material. 
