324 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 4 



Aphis pulverulens, n, sp. Plate 9, Figures 1 to 9. 



Specimens taken from Symphoricarpos occidentalis at Fort Collins, 

 May 31, 1909; L. C. Bragg, collector. 



Apterous Viviparous Female. — The body is covered with a white silvery secretion* 

 giving it the appearance of a species of Pemphigus. When the secretion is removed, 

 the body is of a sordid greenish brown color. The greater portion of the antennae, 

 the tarsi, distal ends of tibiae, distal portion of beak and eyes are black, or blackish. 

 The eyes are really a very dark red; the head and prothorax are a little dusky, as 

 are the basal joints of the antennae; the head and prothorax are very narrow; the 

 antennae are on somewhat prominent tubercles, which, however, have no length 

 on the lateral margins next to the compound eyes; joint G of antenna tapering grad- 

 ually into spur; cornicles short and weak and somewhat curved and light in color, 

 very smooth and with little or no flange, diameter slightly greater near the base than 

 near the distal end; cauda broadly rounded, and not more than half as long as it is 

 wide on the basal margin; beak barely attaining third coxae; body very smooth and 

 free from hairs. 



Body varying little from 3 mm. long by 1.07 mm. wide. Length of cornicles 

 .21mm.; hind tibia? 1.63 mm.; joint.s of antennae: III, .90; IV, .49; V, .37; VI, .14; 

 spur, ..57 mm. 



The larvae are pale carneous and may be tinged with green. 



It seems likely that these apterous females are stem-mothers. 



Alate Viviparous Females. Reared from the same lot as the apterous form described 

 above. 



The entire body and legs are covered with a cottony secretion as in the apterous 

 form. General color of body, legs and antenna the same as in the apterous. Lobes 

 of the thorax above black, head and prothorax black or blackish, cornicles as in 

 the apterous form except that they are dusky brown in color. Antennae with numer- 

 ous hairs, and tuberculate sensoria; cauda small, rounded at apex, broader than 

 long; cornicles weak and without flange; stigma of wing long, narrow and parallel 

 sided, .second fork of cubitus a little nearer the apex of the wing than to the first 

 fork. 



Length of body 3 mm., width 1.34 mm.; antennae 2.78 mm.; joints of antennae 

 about as follows: III, .90; IV, .57; V, .43; VI, .13; spur, .59 mm.; cornicle, .20 mm.; 

 wing, 4 mm. 



Male: Apterous, from stems at ground and on upper roots of Symphoricarpos 

 occidentalis, taken at Fort Collins, October 15, 1910. 



General color carneous, or yellowish brown; head, entire antennae, cornicles, 

 tarsi, and distal ends of tibiae and femora black or blackish; ej^es dark red. 



Length 1.90 mm.; antenna 1.84 mm.; joints of antennae: III, .60; IV, .36; V, .26; 

 VI, .10; spur, .40 mm. 



Antenna with a moderate number of short hairs; joint 6 tapers gradually into 

 the spur; sensoria abundant on joint 3 and a few on joint 4. 



Oviparous Female: Apterous and a little darker than the viviparous female, 

 :also smaller and more elongate. Cornicles concolorous with the body; entire body 

 more or less heavily powdered above and below; length of body 3 mm.; cornicles 

 weak, cylindrical, .24 mm. long, without flange; length of antenna 2.20 mm.; joints 

 about as follows: III, .70; IV, .35; V, .31; VI, .14; spur, .44 mm. Tarsi, distal 

 ends of tibiae and most of distal portion of the antennae black or blackish; hind 

 tibiae with numerous circular sen.soria (or scent glands) on upper tliird of hind tibiae. 



