The Aphididac of Nebraska 39 



along the midrib on the upper side of the leaves and cause the 

 edges to roll upwards, enclosing the lice in its folds. My speci- 

 mens agree with the description given by Kaltenbach much better 

 than with that by Buckton. 



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

 (110.58). 



45. Aphis canae n. sp. 



Apterous form: General color green, darker on head and central sub- 

 circular spot on abdomen. In some individuals this spot is very irregular, 

 giving the abdomen a mottled appearance. There is generally a whitish 

 transverse band just behind the thorax. Antennae about half the body in 

 length, pale, tips black. Legs pale, tarsi black. Honey tubes black, about 

 0.15 mm. long. Tail short, conical, black. 



Winged form: Head and thorax black. Antennae shorter than the body, 

 two basal joints dusky; III and lower part of IV paler, remainder dusky 

 to black; IV but little shorter than III, V shorter than IV, VI two thirds 

 V and equaling VII. Whole of antennae annulated. Prothorax without 

 lateral tubercle. Wings rather delicate, with slender brownish veins. 

 Stigma dusky. Stigmal vein curved gradually for its entire length. Legs 

 with upper part of femora and upper part of tibiae pale, remainder black. 

 Abdomen green with some darker mottlings. Honey tubes black, 0.16 

 mm. long, slightly swollen above the base. Tail short, conical, black. 

 Length of body 1.24 mm. to tip of wings 2.25 mm. The apterous vivi- 

 parous female is about 1.60 mm. in length. It also has the abdomen very 

 broad and frequently the antennae nearly all black. 



A very pretty species found on the stem and leaves of Arte- 

 misia casta, generally in company with Siphonophora artemisiana. 

 Squaw Canyon, June 24, 1890. 



Cotypes in collection of the University of Nebraska (no. 54) 

 and of the U. S. National Museum (no. 60). 



46. Aphis chrysanthemicola n. sp. 



Apterous viviparous female: Green, slightly pruinose. Antennae about 

 one half the body in length; I. II. Ill and sometimes IV pale, remainder 

 dusky black. Eyes red. Beak reaching to third pair of coxae, acute, 

 black tipped. Legs with all of the femora and tibiae green. Tarsi black. 

 Honey tubes long, reaching almost or quite to the tip of the abdomen, 

 slightly swollen near the tip, with green bases and dusky tips. Tail one 

 third the honey tubes, concolorous with the abdomen. Length of body 

 1.25 to 1.50 mm. 



12; 



