ART. 10 GALL-INHABITING CYNIPID WASPS WELD 91 



is then distributed over at least two seasons. Ashniead called it the 

 " difficult gall " because he was six years in trying to rear the 

 maker, " collecting them either too early or too late." He probably 

 did not keep them in a suitable breeding cage long enough. 



CALLIRHYTIS FLAVIPES (Gillette) 



Neuroterus flavipes Gillette, Iowa Agr. Expt. Sta. Bull. 7, 1889, p. 281. 



This species produces a fleshy midrib swelling on the leaves of 

 QiLercus macrocarpa in spring. Galls containing pupae were col- 

 lected in Illinois at Evanston June 17, 1911, and at Winnetka June 

 28, 1907. Galls at Moline contained pupae June 20, 1915, and adults 

 began to emerge June 23. From galls at Palos Park the adults had 

 already emerged on July 2, 1917. The galls were seen also at Miller, 

 Ind., and Brodie collected galls at Toronto. The species has pre- 

 viously been reported only from Ames, Iowa. The adults reared 

 agree with paratypes in the National Museum and the species is 

 here transferi'ed to C allirhyth ^ where because of the very short- 

 ])ubescent, non-ciliate, hyaline-veined wings, it is related to those 

 species bred from the flowers of oak. The forest-insect collection 

 has flies, determined by the writer as this species, reared June 19, 

 1915. at Falls Church, Va., from a gall on Q. alha. 



CALLIRHYTIS FLAVOHIRTA (Beutenmueller) 



Andricus ficivoliiiiiis Beutenmueller, luscut. lusclt. Menst., vol. 1, 1913, p. 

 124. 



On July 20, 1912, the writer collected a number of these bud galls 

 in clusters on Q. incolov at the ends of the new growth on the banks 

 of the Chicago River, Avest of Ravenswood, at Chicago, 111. They 

 v.ere then full grown and the bracts about the galls were narrow 

 and inconspicuous. As the bracts develop they eventually dislodge 

 the gall and continue to grow until by fall there is a conspicuous 

 terminal rosette of bracts. If the gall is attacked by guests or para- 

 sites, it does not drop to the ground, and when such galls are 

 gathered in fall or winter one fails, of course, to rear the maker 

 from them. These galls collected in July were put in a box in a 

 terrarium in the laboratory, where by October 6 the mass moulded 

 and was about to be thrown away when one of the galls was opened 

 and a living adult obtained. The outer smooth fleshy layer of the 

 gall had rotted away, leaving a hard, rough, thin brittle shell. 

 This fly lived in a vial in laboratory until November 1. The flies 

 probably emerge normally in the spring. This fly has been com- 

 pared with the type of fuvohirtus and seems to be the same. As 

 the claws are simple, the species is here transferred to Callirhytis. 

 These galls on hicolar have been seen at Evanston, Wilmette, and 

 Ravinia, 111. 



