1 6 Thomas Albert Williams 



Forming a club-shaped pedunculated gall on the upper side of 

 leaves of white elm (Minus amcricana) . 



The gall is from one half to one inch long and while growing 

 has much the appearance of the gall made by Tetraneura ulmi of 

 Europe. The stem-mother and wingless young were found at 

 Ashland, June II, 1890, and the fully developed winged form was 

 collected at Lincoln (Dinges) June 29, 1889. 



No specimens in either collection. 



Subfamily SCHIZONEURINAE 

 Genus Schizoneura 

 13. Schizoneura americana Riley. 



Riley, Bull. U. S. Geol. Sur. Ter., Vol. V, No. 1, p. 4, pi. I, fig. 1 (a 



to h) (1879). 

 Thomas, Ins. 111., 8th Rep., p. 202, fig. 44 (1879). 

 Oestlund, Syn. Aph. Minn., p. 27 (1887). 



" Impregnated egg : 0.50 mm. long, gamboge-yellow, inclining to brown 

 in color, with no especial external sculpture. 



" First generation : Stem-mother pale yellowish red, with black members 

 when first hatched, the red deepening and becoming purplish or livid with 

 age. When mature, averaging 3.50 mm. in length, globose or pyriform, 

 with subobsolete honey tubes and six dorsal rows of darker piliferous and 

 tuberculous spots. Antennae 5-jointed, with III more than equaling IV 

 and V together in length. 



"Second generation: Differing in no essential respect from the preced- 

 ing, except that the individuals do not attain so great a size. Bright 

 brownish red when born, they soon become livid brown. 



" Third generation : Mature winged female, alar expanse 5 to 5.60 mm. 

 Body dusky, the abdomen slightly reddish; legs either dusky or yellowish 

 red. Antennae as long as head and thorax together, dusky, rarely yel- 

 lowish, not pilose, but with a few short setous points; 6-jointed, I and II 

 slightly bulbous; III either surpassing or equaling in length IV, V and 

 VI together, which are subequal; the terminal joint usually shortest, -the 

 apical subjoint being normal, and in some cases sufficiently constricted to 

 resemble an additional joint; III. IV and V rather distinctly annulated, 

 the constrictions being generally quite deep and producing a moniliform 

 aspect, there being on an average 22 such on III. Tarsi with basal joint 

 distinctly separated into a lobe, the claws strong and in length twice the 

 diameter of the tarsus. Wings hyaline ; front pair with veins becoming 

 obsolete at tips ; stigma subhyaline, either of a yellowish tinge or some- 

 what dusky ; stigmal vein starting from the middle of the stigma, and 



IOO 



