ART. 10 GALT.-INHABITING CINIPID WASPS AVELD 13 



Habitat. — The type material is from galls collected on Q. mctcro- 

 carpa at WilloAv Springs, 111., May 24, 1919, when some of the cells 

 contained larvae and others pupae. The adults issued by JSlay HO. 

 The galls were seen also at Evanston. 



Biology. — On June 16, 1916, empty galls on burr oak were seen 

 at Evanston and on the same stump sprouts were found half-grown 

 galls of the saltaHus described above suggesting that this is the alter- 

 nating generation of that species. On May 28, 1916, at Evanston on 

 the small lower branches from the trunk of a tree of Q. hicolor these 

 galls Avere found, some with exit holes and others containing pupae. 

 Adults apparently from these galls were seen ovipositing on the 

 under side of the leaves which were then about 3 inches long. Un- 

 fortunately none of the flies was preserved. Old leaves on the 

 ground bore evidence of the presence of the jumping gall the pre- 

 vious fall. Experimental proof of this suggested life history is 

 needed as the adults seem to go in the subgenus Diplohius., created 

 for species whose alternating galls are practically identical. 



NEUROTERUS UMBILICATUS Bassett 



Galls on Quercus hicolor., agreeing with Bassett specimens, were 

 collected at Washington, D. C, on September 23, 1923. No adults 

 were reared, as some of the galls at least still contained larvae 

 June 1, 1924. In late October, 1924, William Beutenmueller col- 

 lected galls at Tenafly. N. J., and sent some to the writer for rearing. 

 I'p to Januar}^ 1, 1926, he had reared nothing from the thousands 

 of galls in his breeding cages, some indoors and some out, nor has 

 the writer succeeded in rearing the adults. Galls were also seen at 

 Ithaca, X. Y. 



NEUROTERUS VERNUS Gillette 



The writer has found galls of this species only once, and at Moline, 

 111. The adults had all emerged before Jul}^ 21. 



NEUROTERUS VESICULA (Bassett) 



The galls of this species were described as starting their devel- 

 opment in the fall, maturing quickly in the spring, the adults emerg- 

 ing about the time the oak leaves begin to expand. The writer has 

 no evidence to show that this succulent gall develops partially in 

 the fall, but they do occur and become full. grown before the buds 

 start in the spring, the adults emerging either before or just as the 

 buds ojDen. They have been noted on Quercus alba., from which the 

 species was described, at Ravinia, 111., containing both pupae and 

 adults on April 24, 1915, the adults beginning to emerge April 29. 

 Fort Sheridan galls contained pupae May 12, 1917, adults emerg- 

 ing May 18. In 1920 galls contained pupae at Cherrydale, Va., on 



