The Aphididae of Nebraska 73 



Specimens in the collection of the U. S. National Museum 

 (nos. 3, 381). 



92. Siphonophora artemisicola n. sp. 



Apterous form: General color of body pale green, the entire body covered 

 with white capitate hairs, giving the insect a very pulverulent appearance 

 and a color similar to the plant upon which it feeds. Some specimens have 

 a row of marginal dots but these are lacking in many. All have a light 

 brownish green medial line when first collected, which disappears when 

 the insect is mounted in balsam. Antennae about as long as the body, but 

 varying; VII longest; I dusky; II, III and lower part of IV paler, remain- 

 ing joints black. Legs black, with upper part of femora and middle part 

 of tibiae paler. Honey tubes black, very slender, 0.45 to 0.50 mm. in 

 length. Tail white, short, subconical, acute, about 0.15 mm. long. Length 

 of body 1.70 to 1.90 mm. 



A very active species, similar in some respects to 6". ludovi- 

 cianae Oest. It is easily distinguished by the white, capitate hairs, 

 short tail and other minor points. 



On upper part of stem and leaves of Artemisia cana. Squaw 

 Canyon, June 24, 1890. What seems to be the same thing was 

 taken on Cnicus lanceolatus at Brookings, S. D., July 11, 1891. 

 In the Dakota specimens, however, the legs, antennae and honey 

 tubes are pale, but the colors of the body, the slender honey tubes 

 and the abundance of capitate hairs serve to distinguish the 

 species. 



Cotypes in the collection of the University of Nebraska (no. 

 126) and of the U. S. National Museum (no. 4). 



93. Siphonophora carnosa B nekton. 



Buckton, Mon. Brit. Aph., Vol. I, p. 144, pi. XX (1876). 



Apterous viviparous female: Large. Dark ginger brown, lilac, flesh- 

 color or gray. Hoary, punctured, much corrugated, particularly near the 

 carina or connexivum. Head and thorax broad. Antennae and legs ginger 

 brown and hairy. Depressions on the first and second thoracic rings. 

 Carina much marked and wrinkled. Tail brown. Length of body 3.30 mm. 



Pupa: Smaller than the larva. Most usually of a rosy pink, with green- 

 ish wing cases. Carina distinct. The hoary coat more pronounced than 

 in the larva. 



Winged viviparous female: Large. The imagos on emerging from the 

 pupae are first of a delicate gray, afterwards they become green, warm red- 

 dish, ginger brown or flesh-color. All forms are hoary. The ocelli are 



157 



