90 PROCEEDINGS OF THE NATIONAL MUSEUM vol.68 



CALLIRHYTIS CORNIGERA (Ostcn Sacken) 



The following localities are here recorded for this species: liavina. 

 Fort Sheridan, and Palos Park, 111.; Milhr and Chesterton. Ind. ; 

 Poplar Bluff, Mo.; DeWitt, Ark.: Mineola, Palestine, and Rich- 

 mond, Tex. ; Troy, Ala. ; Waterford. Alexandria, and Richmond, 

 Va. ; Raleigh, N. C. ; Washington, D. C. ; Chesapeake Beach, Md. ; 

 Blue Hills, Mass. R. S. Walker collected a fine lot of galls near 

 Chattanooga, Tenn. 



In the Chicago area the nearly grown fresh galls in middle of 

 May are covered with normal l)ark and look hard and woody, but 

 with a knife the tissue cuts like cheese, the pinkish horns inside not 

 quite reaching the surfac?, the basal part of the horn filled with 

 translucent nutritive matter with no larval cavity evident. The tips 

 of these horns soon break through the surface and they come to pro- 

 trude a considerable distance dropping to the ground early in July. 

 Some of these gathered from the ground in July were put in breed- 

 ing cage July 16, 1917, and found to contain living adults November 

 26, 1917, which emerged normally May 12, 1918. If attacked by 

 parasites these horns do not slip out. Seski scituJa Harris feeds on 

 the tissue of the gall. Brodie collected galls at Toronto. 



CALLIRHYTIS CRYPTA (Ashmead) 



Described as forming galls on Q. cateshae-i, similar galls deter- 

 mined as those of this species have been found on Q. marilandica, 

 cinerea, and rubra. They have been collected at Fairfax, S. C. ; 

 Jacksonville, Gainesville, Marianna, River Junction, and St. Peters- 

 burg, Fla. ; Dothan, Ala.; Laurel (M. L. Polk), Miss.; Victoria, 

 Cuero, and College Station, Tex. At Jacksonville flies were emerg- 

 ing from galls on Q. cateshaei on April 4, 1914, and ovipositing in 

 the internodes of the new growth. 



CALLIRHYTIS DIFFICILIS (Ashmead) 



The galls of this species were described from Q. cinerea, but they 

 occur also on Q. phellos, laurifolia, nigr-a, and myrtifolia. They 

 have been noted at Jacksonville, Daytona. Clearwater, St. Peters- 

 burg, Ocala, Gainesville, Madison, Carabelle, River Junction, Mari- 

 anna, and Cottondale, Fla. ; Troy and Montgomery, Ala. ; Houston, 

 Palestine, and Trinity, Tex.; Texarkana and Hoxie. Ark.; Tuska- 

 homa, Okla.; and Poplar BlulT, Mo. Galls on Q. phellos at Hoxie 

 had mostly all dropped to the ground on October 10, 1917. Kept 

 in out-of-door breeding cage, they contained pupae August 22, 1919, 

 and adults September 27. Some flies issued December 3, 1919, 

 but some galls still contained larvae, and another fly emerged Octo- 

 ber 10, 1920. The emergence is thus delayed for two winters and 



