34 Thomas Albert Williams 



the body, pale, with darker articulations, growing darker towards the tips, 

 VII dusky to black; as long as, or becoming much longer than, III; the 

 latter with a single row of sensoria. Beak short, not reaching to middle 

 coxae. Legs pale, with dusky tips and tarsi, rather long. Abdomen with 

 several large, more or less brown, tooth-like tubercles on the basal seg- 

 ments of the dorsum, each tipped with a short stiff hair, and marginal 

 spots of brown. These latter are often obscure or wanting. Wings large; 

 veins slender, more or less bordered with brown, especially the cubital and 

 stigmal veins. The border becomes broadened into a black patch at the 

 margins of the wing. Stigma short and broad, angled, gray, with dusky 

 margins. Stigmal vein very sharply curved at first, then almost straight, 

 with the smoky band thickest at each end. Marginal cell very broad. 

 Honey tubes very much enlarged at the base, dusky, 0.35 mm. Tail short 

 and knobbed, pale. Length of body about 240 mm., to tip of wings 3.95 mm. 



Very common on maple (Acer dasycarpum). Ashland, Lin- 

 coln, Weeping Water. The past season at the former place they 

 were so thick as to cover almost all plants in the vicinity of the 

 maples, when the winged form was most plentiful (September- 

 October). It is a very pretty louse and varies much in size and 

 coloration. 



Specimens in collection of the University of Nebraska (nos. 

 45-40,) and of the U. S. National Museum (no. 226). 



Genus Melanoxanthus 



38. Melanoxanthus bicolor Oestlund. 



Ashland, on Salix, October 10, 1890, specimen no. 49a, Univer- 

 sity of Nebraska collection. 



Tribe APHIDINI 

 Genus Hyalopterus 



39. Hyalopterus pruni (Fabricius). 



Fabricius, Ent. Syst, IV, p. 213 (1794). Aphis pruni. 

 Kaltenbach, Mon. Pflan., p. 52 (1843). Aphis pruni. 

 Koch, Die Pflan., p. 22, figs. 29, 30 (1854). Hyalopterus pruni. 

 Buckton, Mon. Brit. Aph., II, p. no, pi. LXXV, figs. 1-3 (1879). 



Hyalopterus pruni. 

 Thomas, Ins. 111., 8th Rep., p. 82 (1879). Hyalopterus pruni. 

 Apterous viviparous female: Long oval, pale green with darker mot- 

 tlings. Dorsum with a more or less distinct longitudinal stripe of darker 



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