ART. 10 GALL-INHABITING CYNIPID WASPS WELD 65 



ing, granulate in front smoother behind with indistinct setigerous 

 punctures, parasidal grooves deep, narrow, no median, hind margin 

 arcuate. Scutellum disk finely rugose, its sides halfway back 

 bounded by diverging carinae, no pits at base. Neck of propodeum 

 rugose, the outwardly curved carinae discontinuous and branched. 

 Mesopleura smooth, pubescent. Hind tarsus .7 as long as tibia, claws 

 with a tooth. Wing hyaline, pubescent, ciliate, veins yellowish, first 

 abscissa of radius angled and clouded, second nearly straight and 

 enlarged near Aving margin and parallel with it a linear cloud in 

 upper third of third cubital cell and a shorter, less distinct one in 

 lower third, both pointing toward the areolet. In some specimens 

 these clouds are missing, especially in specimens cut from gall and 

 killed at once. Areolet reaching one-sixth way to basal, cubitus 

 reaching basal. Abdomen longer than head and thorax, length to 

 height to width as 42:30:25, lengths of tergites along dorsal curva- 

 ture as 36 : 8 : 5, hind margin very oblique, sides of all the tergites 

 covered with white pubescence, ventral spine short, broad, rounded 

 at end, bristly. Using width of head as a base, the length of mesono- 

 tum ratio is 1.3, antenna 2.4, ovipositor 1.9, wing 4.6. Length, 

 2.7-4.65 mm. Average of 102 measured specimens, 3.67 mm. 

 • Type.— Ciii. No. 27206, U.S.N.M. Type and 49 paratypes. Para- 

 types at American Museum, Field, Stanford, Harvard, and Phila- 

 delphia Academy. 

 Host — Quercus oblongifolia^ arizonica. 



Gall (fig. 12). — Globular, 8-11 mm. in diameter, produced singly 

 in the fall on the under side of leaf saddled on midrib. Lead color 

 when fresh with a Avhitish bloom that easily rubs off and leaves a 

 shining surface. Green or rosy on one side when growing, tan- 

 colored when old. Monothalamous, the larval cavity surrounded 

 by a wall about one-third the diameter of gall thick. 



Habitat. — The type is selected from a series of 46 flies from galls 

 on Q. ohlongifolia collected November 27, 1917, by Hofer and Ed- 

 monston in Esperara Canyon (East) in the Santa Catalina Moun- 

 tains, Ariz., the flies emerging December 14, January 8 and 25 

 (Hopkins U S. No. 136876). One paratype is from Santa Catalina 

 Mountains (Hopkins I J. S. No. 13643s) reared November 22, 1915, 

 M. Chrisman, collector; six are from galls on Q. ohlongifolia col- 

 lected by the writer in the Santa Rita Mountains December 7, 1921, 

 Avhen the galls contained pupae. The flies emerged January 12, 13, 

 and February 3, 4. Forty-eight are from galls on Q. aHsonica col- 

 lected at Oracle on December 17, 1921 (Hopkins U. S. No 15639&), 

 the flies emerging December 30, January 24, and February 6. One 

 is from the Chiricahua Mountains, cut out of a gall on Q. arizonica 

 G0726— 26 .5 



