6 Thomas Albert Williams 



species, but these are not among the descriptions left by Williams 

 in the thesis nor are there slides of the same, and consequently 

 they will probably have to continue as nomina nuda. Phorodon 

 monardae also is not included in the thesis but Williams has left 

 a slide in the University of Nebraska Collection (no. 160) la- 

 beled " n. sp.," " type," from which a description can probably 

 later be drawn. The remaining species mentioned in the " Host- 

 Plant List " are represented by both descriptions and specimens 

 except in the case of Pemphigus walshii, Lachnus flocculosa and 

 Siphonophora eupatorii, of which species there are no specimens 

 in the collection but of which there are full descriptions. 



Family APHIDIDAE 

 Subfamily CHERMESINAE 

 Genus Phylloxera 

 I. Phylloxera caryae-caulis (Fitch). 



Fitch, Ins. N. Y., I and II, p. 155 (1854). {Pemphigus caryae-caulis.) 



Shimer, Trans. Am. Ent. Soc, II, p. 389, ibid., p. 391 (1869). (Dacty- 

 lospJiaera subellipticum and D. caryae-magnum.) 



Riley, Ins. Mo., 7th Rep., p. 117 (1875). (Phylloxera caryae-caulis.) 



Thomas, Ins. 111., 8th Rep., p. 160 (1879). 

 Apterous oviparous female: Body distended with eggs. Broadly pear- 

 shaped, rapidly narrowed behind. General color dirty white to yellowish 

 green. Antennae brown; 3-jointed; III about two thirds the whole an- 

 tennae; 0.40 mm. long. Beak brownish, 0.45 mm. long. Legs short, 

 brown. Coxae brown. Body about 1.95 mm. long and 1.50 mm. wide. 



The very young are uniformly whitish, becoming greenish yellow with 

 age. The pupae are light yellowish green, with the head and thorax often 

 slightly dusky. Eyes red. Antennae and legs dusky. About 1.00 mm. 

 in length. 



Winged form: General color light yellowish green; head and thorax 

 brown to black. Eyes bright red. Antennae brownish, 0.25 mm. long; 

 III about 0.16 mm. long, with a large tooth-like projection near the base, 

 then becoming narrow and the end club-shaped. Legs dusky. Abdomen 

 drawn out behind with a gradually narrowed outline. Beak about the 

 length of the antennae, dusky especially toward the tip. Wings hyaline; 

 stigma with both ends pointed, having the appearance of a thickened por- 

 tion of the wing, opaque. Oblique veins dusky, robust, well defined 

 throughout. Length of body 1.20-1.50 mm., to tip of wings 1.50-2.25 mm., 



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