112 IOWA ACADEMY OF SCIENCES. 



Andricus Jiocci, Walsh. Proc. Ent. Soc. Pha., V. II, p. 482. 



Galls appear as little bunches of brown wool attached to the underside of 

 the leaves of Q. alba and Q. macrocarjm. Under the woolly growth, attached 

 to the midrib, are several small seed-like bodies about one-half as large as a 

 kernel of wheat. The galls remain attached to the leaf over winter and the 

 flies emerge in the spring. Illinois, Michigan, Iowa. 



Andricus petiolicola Bass. Proc. Ent. Soc. Pha., v. II, p. 325. 



The galls are hard, semi-globular swellings on the petioles of the leaves of 

 Q. montana, Q. macrocarpa, Q. alba, Q. bicolor and Q. prinus ('?). They 

 vary in size from three-eighths to tive-eighths of an inch in diameter. Flies 

 emerge about June 20. Iowa, Michigan, Connecticut. 



Atidrictis piger Bsifis. Can. Ent., v. XIII, p. 105. 



The galls much resemble those of Andricus tumijica. They are irregular 

 swellings along the midrib on the under side of a leaf of Q. coccinea (rubra). 

 Galls collected in the fall of 1888 did not give the flies until the spring of 

 1889. Mr. Bassett in his description of this species says he obtained the flies 

 in the fall. Connecticut, Iowa. 



Andricus singularis Bass. Proc. Ent. Soc. Pha., v. II, p. 336. 



Produces globular, thin-shelled galls with the central larval cell held in 

 place by radiating fibers. The galls grow through the blades of the leaves of 

 Q. rubra, projecting more from below than above. Flies emerge about the 

 10th of July. Connecticut, Michigan, Iowa. 



Andricus utriculus Bass. Can, Ent., v. XIII, p. 78. 



Producing small globular galls about one-eighth of an inch in diameter, on 

 the leaves of Q. alba. Very often the galls entirely prevent the develop- 

 ment of the leaf blade. The gall is without a larval cell. Flies emerge 

 about June 10. Connecticut, Iowa. 



Cyriips dimorphits Ash. MS. 



Producing red globular galls about one-eighth of an inch in diameter when 

 full grown and occurring in clusters of from twenty to fifty, along the mid- 

 rib and usually on the under side of the leaves. I have taken this gall in 

 Michigan on Q. macrocarpa, Q. 6icoZor and Q. prinus, and it is very common 

 in Iowa on the leaves of Q. macrocarpa. The galls fall from the leaves in 

 September and October, and the flies do not emerge until the following sum- 

 mer. Florida, Michigan, Iowa. 



Cynips strobilana O. S. Proc. Ent. Soc. Pha., v. I, p. 2.54 (gall), III, p. 

 690 (fly). 



Producing clusters of galls from one to two inches in diameter, and made 

 up of a large number of wedge-shaped pieces, attached to the tip of a twig 

 of Q. macrocarpa or Q. bicolor. The galls remain attached to the twigs over 

 winter, and the flies emerge the following summer. District of Columbia, 

 Michigan, Iowa. 



Acraspis erinacei Walsh. Proc. Ent. Soc. Pha., v. II, p. 483. 



The galls are hard, globular or oblong excrescences, .the size of a large pea 

 or bean, attached to the midrib or one of the main veins of the leaves of Q. 

 alba. The surface of the gall is densely covered with little seed-like points, 

 most of which terminate in a vegetable hair. The galls are of a light yel- 

 low or straw color, often tinged with red. The insects issue in October, and 

 are wi 



