ART. 10 GALL-INHABITING CYNIPID WASPS AVELD 11 



NEUROTERUS SALTARIUS, new species 



Agamic female. — -Black, flagelliim infiiseated. lighter at base, 

 tarsi pale, tibiae infuscated, knees pale. Head coriaceous, cheeks 

 not enlarged behind eyes, eyes scarcely protuberant, malar space 

 one-fourth ej^e, with gioove, antenna 13- segmented, lengths as 

 (scape) 23 (width 12) : 20(11) : 28(7) : 14: 13 : 14: 14: 15 : 15 : IG: 15 : 

 14:21. Mesonotum smooth, naked, polished, length to width as 

 31 : 21, no trace of grooves. Mesopleura polished. Claws simple. 

 Wing h3'aline, pubescent, ciliate, veins brown, first abscissa of radius 

 angulate, second at right angles, straight, radial cell live times as 

 long as broad, areolet indistinct, second intercubitus set at an angle 

 of 55" with basal, cubitus faint, reaching basal half-way below mid- 

 dle. Abdomen as long as head and thorax, more or less collapsed, 

 ventral spine twice as long as broad. Using width of head as a 

 base the length of mesonotum ratio is 1.1, antenna 1.9, ovipositor 

 2.8, wing 4.1. Length .8-1.2 mm. Average of 42 specimens 1.0 mm. 



Type.— Cat No. 27182, U. S. N. M. Type and 13 paratypes. 

 Paratypes in Field Museum, American Museum, and Stanford. 



Host. — Quei'cus nnacrocar'pa. 



Gall (fig. 2). — Small, seed-like bodies, inserted in cup-like depres- 

 sions on the under surface of leaf and causing a prominent light- 

 colored bulging on the upper side of the leaf opposite, often two 

 or three hundred on a leaf, less numerous on the basal part of leaf 

 blade. When growing the galls are greenish-white, somewhat glo- 

 bular, flattened above with a papilla in center and a raised rim, not 

 pubescent. They start to develop in June and in July or August 

 drop to the ground where they exhibit the phenomenon of bounc- 

 ing about until they lodge in some crevice in the soil where they 

 pass the winter. When detached a large scar is left on base of 

 gall. During the winter the galls become tan-colored and some- 

 what compressed laterally, one measured 1.2 mm. long by .9 mm. 

 thick and 1.1 mm. high. 



This gall seems to have been first described in 1876 by Riley who 

 unfortunately applied to it the name of a California species with 

 similar jumping habits. Under this name the eastern gall has been 

 mentioned many times in literature and good figures have been pub- 

 lished of it but up to the present no one seems to have reared the 

 adult. 



Habitat. — The types are from Hope, Ind. Galls collected on 

 burr oak by C. J. Casey showed the bouncing M'hen received at 

 Washington June 26, 1923. These galls were placed in rearing 

 and adults were cut out of them on December 5 and 12, and March 

 26. The writer had collected the galls in four different years at 

 Evanston and Kenilworth, 111., but failed to rear them. At Medina, 



