IOWA ACADEMY OF SCIENCES. HI 



attached singly to buds of Quercus rubra; they fall to the ground in Sep- 

 teuil)er and October, The tlies emerge the following summer, la., Mich. 



J)np/iiholips inajiis O. S. Proc. J^ut. Soc. of Pha., Y. I, p. ;i42. 



Globular tiiin-shelledgall from three-fourths of an inch to an inch in diame- 

 ter with small central cell held in place by delicate radiating fibers. Occuring 

 on leaves of Quercus rubra and Q. coccinea (?) in June. A common species 

 east and west and one of the so-called oak-apples. 



Amphibolijys sculpta Bass. Proc. Ent. Soc. Pha., V. II, p. 324. 



Produces a globular translucent gall from three to six eights of an inch in 

 diameter, much resembling a large green grape but usually rosy in color. 

 The galls are attached to the underside of the leaves of Quercus rubra and 

 Q. coccinea ['i). Flies appear about July 4. Connecticut, Michigan Iowa. 

 Rather rare in Iowa. 



Andricus [Sab-gen. Callirhytis) clavula Bass. Proc. Ent. Soc. Pha., V. 

 IV, p. 351. 



The galls are club-shaped enlargements of the ends of the twigs 

 of Quercus alba. Flies emerge in July. Common east and west. 



A. (Callirhytis) cornigera O. S. Proc. Ent. Soc. Pha., v. IV, p. 3r)3. 



Galls corresponding well with those of this species have been taken by the 

 M-riter in Michigan aud Iowa from twigs of Quercus rubra, but no flies have 

 been reared from them and they may prove to belong to a different species. 

 The gall usually occurs on Q. palustris. It is an abrupt woody enlargement 

 surrounding small limbs and is usually from one to one and a half inches in 

 diameter. From the outer rim of the gall are pushed out numerous seed- 

 like bodies each containing the larva of a gall-fly. Virginia, Michigan, Iowa. 



A. [Callirhytis) operator, O. S. Proc. Ent. Soc. Pha., V. I, p. 257. Galls 

 undoubtedly of this species, but from which the flies had emerged, have 

 been taken by the -writer in Michigan and Iowa from twigs of Q. coccinea. 

 The galls are an inch or more in diameter and appear as a mass of brown 

 ■wool. If the woolly growth is picked in pieces it will be found to have 

 many seed-like bodies attached to the twig. The flies emerge in July. 

 D. C, Iowa, Michigan. The gall occurs in the eastern states on Q. nigra. 



A. {Callirhytis) punctatus, Bass. Proc. Ent. Soc. Pha., V. II, p. 524. 



The gall is a smooth, hard, woody swelling entirely surrounding a limb 

 of Q. rubra. The galls vary from one to four inches in length and from one 

 to two or more inches in diameter. The flies emerge in May. Connecticut, 

 Michigan, Iowa, Delaware. 



A. Callirhytis scittdus, Bass. Proc. Ent. Soc. Pha., V. Ill, p. 683. 



The gall is a woody enlargement of the tips of the twigs of Q. rubra and 

 Q. linctoria, sometimes causing the death of the affected part: The flies 

 emerge about July 1. Connecticut, Michigan, Iowa. 



A. [Callirhytis) seminator, Harr. Treat, on Ins., 2d Ed., p. 432. 



The gall of this species is a brown woolly mass from one to two inches in 

 diameter and enclosing a large numl)er of seed-like bodies each one of 

 which contains an in.sect. Always occuring on the twigs of Q. alba. Iowa. 

 Michigan, Flordia, Eastern U. S. 



A. [Callirhytis) tumijica, O. S. Proc. Ent. Soc. Pha., V. IV, p. 356. 



The gall is a hard swelling along the midrib, generally near the petiole of 

 a leaf of Q. tinctoria and Q. rubra. Each gall contains several flies which 

 emerge about June 20. New York, Iowa. 



