The Aphididae of Nebraska 63 



On flower umbels of bull parsnip. War Bonnet Canyon, June 

 21, 1890. My specimens are a link between 6\ pastinaccae of 

 Buckton and S. archangclicae Oestlund. I think the latter is but a 

 variety of the former, the only differences that I can make out 

 being a slight variation in color and IV being tuberculate in Oest- 

 lund's specimen. 



Specimens in the collection of the University of Nebraska (nos. 

 100, 101) and of the U. S. National Museum (no. 80). 



Tribe NECTAROPHORINI 



Genus Myzus 

 78. Myzus achyrantes (Monell). 



Monell, Bull. U. S. Geo). Sur. Ter., V, 1, p. 18 (1879). Siphonophora 

 achyrantes. 



Thomas, Ins. 111., 8th Rep., p. 187 (1879). Siphonophora achyrantes. 



Oestlund, List Aph. Minn., p. 31 (1886). Myzus malvae. 



Oestlund, Syn. Aph. Minn., p. 74 (1887). Myzus achyrantes. 

 Apterous viviparous female: Pale green, with a dark, irregular stripe 

 on each side of abdomen ; in fully developed specimens occasionally with 

 an additional stripe near the basal part of the abdomen, extending over 

 several segments. 



Winged viviparous female: Head, prothorax and sometimes the upper 

 segments of the abdomen brownish black; the upper part of the thorax 

 with a narrow but conspicuous, transverse yellow band; general color of 

 abdomen pale green, with irregular, broken, transverse, dark brown lines, 

 three of these often becoming confluent and producing a large dark patch 

 in the center of the abdomen just above the honey tubes. Honey tubes 

 long, cylindrical, slightly dusky at their apices. Tail long, slender, slightly 

 curved upward, more or less dusky. Length of antennae a little vari- 

 able, as long as the body or slightly longer. Frontal tubercles approx- 

 imate at base and somewhat porrect. Wings hyaline ; stigma rather nar- 

 row and linear; stigmal vein very short and curved much as in the genus 

 CaUipterus. The forklets of the cubitus are especially variable, their 

 length being in one case four times and in another one half that portion 

 of the cubitus between the base of the lower branch and the base of the 

 forklets. In the normal specimens these distances are subequal. Length 

 of body 2.28 mm., to tip of wings 3.81 mm. (Monell). 



On common amaranth (Amaranthus sp.). Ashland, June 20, 

 1890. Only the apterous form was found, but I am sure it is 



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