1 8 Thomas Albert Williams 



A single egg is visible through the translucent skin, and, according to age, 

 occupies more or less of the whole of the body. The male is narrower 

 and smaller, the penis being bulbous, with a couple of spine-like genital 

 clasps " (Riley). 



On leaves of white elm (Ulmus americana) curling them into 

 a pseudogall. In the spring generally only the side of the leaf 

 is curled up, but later in the season, especially if the insects are 

 plentiful, all parts of the leaf may be twisted out of shape. The 

 stem-mother always settles upon the under side of the leaf. 



These insects hatch out almost as soon as the leaves appear in 

 the spring and do much damage to the trees, especially in cities. 

 Frequently nearly every leaf on a tree will be the abode of one 

 or more colonies of this pest. Found during spring and summer 

 at Ashland, Lincoln, Weeping Water and many other parts of 

 the state, 1888-90. 



Specimens in collection of the University of Nebraska (nos. 

 12, 13, 14, 15) and of the U. S. National Museum (nos. 68, 69, 70). 



14. Schizoneura corni (Fabricius). 



Fabricius, Ent. Syst., IV, p. 214, No. 19 (i794)- Aphis corni. 



Schrank, Fn. Boi., II, p. 108 (1801). Aphis corni. 



Kaltenbach, Mon. Pflan., p. 168 (1843). Schizoneura corni. 



Koch, Die Pflan., p. 268, fig. 343 (1854). Schizoneura vagans. 



Koch, /. c, p. 275, figs. 348, 349. Aniscia corni. 



Passerini, Gli afidi, p. 38 (i860). Schizoneura venusta. 



Walsh, Proc. Ent. Soc. Phil., I, p. 304 (1862). Eriosoma? fungicola. 



Walsh, /. c. E. cornicola. 



Thomas, Ins. 111., 8th Rep., p. 138 (1879). Schizoneura panicola. 



Thomas, /. c. S. fungicola and 5". cornicola. 



Buckton, Mon. Brit. Aph., Ill, p. 107, pi. CX, figs. I to 4 (1881). 

 Schizoneura corni. 



Weed, Psyche, V, p. 129 (1887). Schizoneura cornicola? 



Osborn, Bull. 22, U. S. Ent. Div., p. 32 (1890). Schizoneura corni. 

 "Winged viviparous female (pseudogyna pupifera) : Expanse of wings, 

 6 mm. ; length of body, 2 mm. ; width of body, 0.80 mm. ; length of an- 

 tennae, 0.90 mm. Black above, except anterior and lateral margins of 

 abdomen, and in many specimens more or less of posterior portion. Be- 

 neath black, except prothorax and abdomen (save a black patch in front 

 of anus), which are dull whitish brown. Beak black, except a more or 

 less lighter patch near the base, hairy, reaching posterior coxae. Legs 

 robust, black, except a brownish space at base of anterior femora ; thickly 



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