114: IOWA ACADEMY OF SCIENCES. 



galls much resemble those of Andricus singularis when green, but the outer 

 shell is not so firm, and they collapse upon clryiug. The larval cell is not 

 held in place, but rolls freely about iu the gall. The flies emerge about May 

 20. Michigan, Iowa. 



Neuroterus Jloccosus Bass. Can. Ent., v. XIII, p. 111. 



The galls of this species appear as little brown, woolly patches on the 

 under side of the leaves of Q. macroc.arj)a and Q. bicolor. Hundreds of these 

 often occur upon a single leaf. On the upper surface above each gall is a 

 little raised light colored spot. Ohio, Michigan, Iowa. 



Neuroterus vesicula Bass. Can. Ent., v. XIII, p. 97. 



The galls of this species are little thin-shelled vesicles, about one-tenth of 

 an inch in diameter. These galls occur in the buds of Q. alba and Q. mac- 

 rocariia. Connecticut, Michigan, Iowa. 



Neuroterus nigrum Gill. Rep. Mich. B'rd Agr., 1887, p. 475. Psyche, V, 

 p. 218. 



The galls appear as little pimples from one-twelfth to one-fifteenth of an 

 inch in diameter, showing equally Avell from either side of the leaf. In the 

 vicinity of Ames, Iowa, this gall is enormously abundant, many trees of Q. 

 macrocarpa having hundreds of the galls upon nearly every leaf. The galls 

 occasionally occur upon the leaves of Q. alba. Flies emerge early in the 

 spring. Michigan, Iowa. 



Neteroterus Jlavi2)es Gill. Bull. 7, la. Exp. St., p. 281; Ent. Americana, 

 V. VI, p. 21. 



The gall is a hard, woody swelling on the midrib or one of the main veins 

 of the leaves of Q. viacrocarpa, the leaf becoming wrinkled and deformed 

 as the result. Large galls measure three-fourths of an inch in length by 

 one-fourth of an inch in width. The flies issue early in July. Iowa. 



Neuroterus vernus Gill. Bull. 7, la. Exp. St., p. 281; Ent. Amer., v. VI, 

 p. 22. 



The galls occur upon the leaves and stamen catkins of Q. macrocarpa. 

 Upon the leaves they may occur anywhere along the midrib, but are most 

 common at the base of the petiole. They do not pi'oduce a well-defined gall 

 upon the leaves, but only a slight swelling of the part. The leaves, how- 

 ever, become much deformed, and sometimes the development of the leaf is 

 almost entirely prevented. When the catkins are attacked they become 

 much swollen and remain hanging to the tree until the larva; are fully 

 grown. Flies issue early in June. A very abundant species at Ames, Iowa. 



