98 PROCEEDINGS OF THE NATIONAL MUSEUM voi,. GS 



ilicifolm.; at Medina, N. Y., Ironton. Mo., and Bluemont, Va., on 

 i-ed oak, Q. maxima: at Ithaca, N. Y., Webster Groves and Ironton, 

 Mo., and Washinj^ton, D. C, on Q. velutina. The writer has never 

 been able to rear adults which emerge from the galls the second 

 spring. Brodie collected galls at Toronto. 



The woolly galls on the staminate flowers of the red oaks, yielding 

 the sexual generation, were seen on Q. coccinea at Miller, Ind., where 

 adults were emerging and females ovipositing in the 1-year-old 

 acorns. In 1913 the larvae had not begun to pupate on May 25 and 

 adults issued in breeding cage June 15-28. In 1912 females were 

 seen ovipositing in immature acorns on June 2G. The galls were 

 seen also at Evanston, 111. Crosby collected galls on Q. UicifoUa at 

 East Hampton. Long Island, from which adults emerged June 21. 

 Galls have been seen on red oak at Rosslyn, Va. The writer deter- 

 mines as this species a lot of flies from Halifax, Nova Scotia, reared 

 July 10, 1913. 



CALLIRHYTIS PHELLOS (Osten Sacken) 



The writer has collected galls of this species on Q. imhricaria, a 

 previously unrecorded host, at Rosslyn, Va., June 25, 1923, and 

 adults emerged June 26 and 28. Similar galls, containing pupae, 

 were taken at same locality on Q. phellos on May 14 and living adults 

 cut out June 20. These galls are terminal enlargements of the new 

 growth and scarcely noticeable in June, being green and only about 

 5 mm. in diameter. When cut open they show a central cell sur- 

 rounded by short radiating fibers. For rearing they must be left 

 until at least the pupal stage is reached, and even then the drying 

 out of the gall may so harden the tissues that it will be necessary to 

 cut out the adult. If attacked by guests or parasites, and perhaps 

 even after the escape of the maker, the galls continue to increase in 

 size up to a diameter of 8-10 mm., lose the narroAv radiating layer 

 inside, become woody and covered with normal bark, and then aie 

 quite conspicuous and frequently collected. 



Galls have been collected at Blue Hills, Mass. ; Riverhead (Crosby) 

 and Farmingdale (Crosby), N. Y.; Chesapeake Beach, Md. : Wash- 

 ington, D. C. ; Falls Church, Va. ; Daytona, Clearwater, Ocala, 

 Gainesville, Marianna, and Tallahassee, Fla. ; Palestine, Austin, 

 Boerne, and Kerrville, Tex. ; and Poplar Bluff, Mo. 



CALLIRHYTIS PIGRA (Bassett) 



At Evanston, 111., these galls on Q. velutina and coccinea con- 

 tained adults September 3, 1906; at Poplar Bluff, Mo., contained 

 pupae September 6, 1915. Said to emerge in autumn or next spring. 

 Brodie collected galls at Toronto on two occasions on small second- 

 growth trees of red oak, Q. maxima^ and states that many {n-oducers 

 of both sexes emerged October 7-24, 1888, and October 10-16, 1892. 



