ART. 10 GALL-INHABITING CYNIPID WASPS WELD 55 



XYSTOTEEAS VOLUTELLAE Ashmead 



This species, the genotype of Xystoferas, was described from a 

 single specimen from Manhattan, Kans., from Quercus macrocavfa. 

 The type galls are in the National Museum, but the type fly can 

 not be found there, nor did Ashmead return it to Manhattan, as 

 he is known to have done with certain species sent him from there. 



The writer has collected galls which agree with the Ashmead 

 types, and reared flies which agree with the original description 

 except that balsam mounts show a tooth on the tarsal claws, which 

 were described as simple. As the type seems to be lost it seems 

 advisable to designate this series of reared flies as neotypes, and to 

 add a few notes on the species to supplement the original descrip- 

 tion. The galls were collected in October, 1917, at Texarkana, Ark., 

 on Q. hjrata; and, when a few were opened on November 21, some 

 contained pupae and others living adults. The flies emerged (out- 

 of-doors at Evanston, 111.) on February 19, March 20, April 6, May 

 23, June 14 and 21, 1918. The same galls were seen at Poplar 

 Bluff, Mo., on Q. lyrata. 



The head from in front is as high as broad, malar space .28 eye 

 with groove, antennal segments as (scape) 10: 6: 13:9: 8..5: 8:7: 

 7 : 7 : 6.5 : 6 : 5.5 : 6 : 7. Hind tarsal segments as 22 : 9 : 6 : 5 : 10 (with 

 clavv' 15). Lengths of tergites along dorsal curvature as 68:20: 

 19 : 14 : 15 : 10. Ventral spine in side view four times as long as 

 broad. Using width of head as a base the length of mesonotum 

 ratio is .8, antenna 2.5, ovipositor 4.9. Range in length, 1.5-2.2 mm. 

 Average of 100 specimens, 1.88 mm. 



Cotypes of this series are in the National, American, and Field 

 Museums, at Stanford, Harvard, and in Pliiladelphia Academy. 



ZOPHEROTERAS COMPRESSA (Gillette) 



Acraspis compressus Gillette, Bull. 111. St. Lab. Nat. Hist., vol. 3, 1891, p. 197. 



This species was described from two specimens cut from galls. 

 The gall in the Illinois State laboratory is ellipsoidal, 2.7 mm. by 1.8 

 mm. by 1.8 mm., with a slightly wrinkled brown surface, the wall 

 thin (.2 mm.) and made up of two about equal layers, the outer 

 brown, the inner whitish. Their type fly has been lost. The re- 

 maining gall and fly in the Gillette collection have now been de- 

 posited in the National Museum. The following may be added to 

 the published description: Malar groove present, hind tarsus shorter 

 than tibia, claws simple. It is a Z op heroteras. Never having. reared 

 this species, which seems to be distinct from the following, the writer 

 does not recognize the fresh aralls in the field. 



