122 PRELIMINARY LIST 



Aphis veratri n. sp.* 



"Winged viviparous female: Length 3.20 mm. Length of wing 3.05 mm. Color black, 

 the thorax somewhat ligliter than the rest of the insect. Antennae about 1.36 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., IV 0.35 mm., V 32 mm., VI 0.14 mm., VII 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, 0.3S 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 yiiccae Cowen n. sp.* 



Winged viviparous female: Length 3.20 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 0.43 mm., IV (i.35 mm. V 0.35 mm. V 0.33 mm., VI (i.l5 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, a'jo.'t 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 0.9 1 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 3.70 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 3 mm. Antennae 1.20 mm. long. 

 Honey tubes 0.30 mm." 



Fort Collins, August 6th, on cultivated radish (Baker). 

 Hyalopteris arundinis Fab. 



li^tchkiss, July 12th, veiy abundant on Phragmites com- 



*Measurements from alcoholic materi.il. 



