The Aphididae of Nebraska 3 I 



Specimens in collection of the University of Nebraska (nos. 37, 

 38) and of the U. S. National Museum (no. 19). 



32. Callipterus caryae Monell. 



Monell, Bull. U. S. Geol. Sur. Ter., Vol. V, No. 1, p. 31 (1879). 

 Thomas, Ins. 111., 8th Rep., p. 199 (1879). 



Apterous individuals: General color pale greenish yellow. Legs and an- 

 tennae pale, the latter with the tip of each joint black. Head with four 

 capitate bristled tubercles on front. Dorsum with four rows of brownish 

 tubercles, each with a single capitate bristle on its summit. 



Pupa: As in apterous form, with whitish wing-pads. 



Winged individuals: Pale yellow. Antennae about as long as the body, 

 pale, the tip of each joint black; VII generally longer than VI. Thorax 

 pale olive. Legs all whitish but the last joint of the tarsi which is dusky. 

 Abdomen with four rows of blackish tubercles on its dorsum; these, how- 

 ever, lack the capitate bristles and the rows are not so regular as in the 

 larvae and pupae. Honey tubes subobsolete. Tail short and knobbed. 

 Wings hyaline. Veins pale; second branch of cubitus equidistant from 

 apex of wing and the first branch, rather widely forked. Stigma short 

 and broad, obtuse at both ends, dirty white with dusky base. Stigmal vein 

 subobsolete. Length of body 1.75 mm., to tip of wings 2.85 mm. 



Found on under side of leaves of hickory (Carya amara) and 

 walnut (Juglans nigra). Ashland, August 23, 1890. 



Specimens in collection of the University of Nebraska (nos. 39, 

 40) and of the U. S. National Museum (no. 20). 



33. Callipterus discolor Monell. 



Monell, Bull. U. S. Geol. Sur. Ter., V, No. 1, p. 30 (1879). 



Oestlund, Syn, Aph. Minn., p. 41 (1887). 



Thomas, Ins. 111., 8th Rep., p. 108 (1879). Mysocallis bella. 



Apterous form: Color pale yellowish, with about four rows of dark 

 green spots along the dorsum; sometimes these are almost obsolete, espe- 

 cially in the younger individuals. Covered with long capitate hairs. An- 

 tennae pale, with the articulations black. 



Winged form: General color greenish yellow. Head somewhat darker. 

 Thorax with a dusky band on either side. Abdomen with four rows of 

 irregular brownish spots, often with smaller dots between them, the two 

 middle rows more or less confluent just above the honey tubes. Head 

 pointed in front. Eyes red. Antennae about as long as the body ; tips 

 of III-VI dusky to black; III longest, VII longer than VI. Legs pale. 

 Tarsi dusky. Wings with irregular dusky spots, arranged in two oblique 

 bands, which are especially noticeable when the insect is at rest ; a smoky 

 patch at tips of all the oblique veins ; stigma short. Honey tubes short, 

 greenish yellow. Length of body about 1.75 mm., to tips of wings 3.30 mm. 



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