24 PROCEEDINGS OF THE NATIONAL MUSEUM vol.68 



Flies were emerging at Waukegan from galls on red oak, Q. 

 maxima on May 27, 1911. The National Museum has a fly from 

 Washington that emerged Maj^ 19, 1918. 



DIPLOLEPIS CLAVULA (Beutenmueller) 



This species was described from a series of flies in the National 

 Museum reared from galls collected by Koebele in Sonoma and Napa 

 Counties. The writer collected galls on Quercus lobata at following 

 locations in California: Chico, Calistoga, Stockton, Kaweah, and 

 Lebec. Dr. J. C. Bradley collected one at Napa. The galls are just 

 starting in August and become full grown in September and should 

 be collected in late fall for rearing. 



DIPLOLEPIS DISCALIS, new species 



Female. — Reddish-brown, some specimens darker than otiiers. 

 Head coriaceous; from above as broad as thorax, cheeks not broad- 

 ened behind ej^es, occiput not concave; from in front almost cir- 

 cular in outline, face pubescent, facial quadrangle one and two-tenths 

 times as broad as high, malar space one-third eye without groove, 

 antenna 13-segmented, lengths as (scape) 11:7:15:12:10:9:8:8: 

 8 : 7.5 : 7 : 6 : 11. Mesonotum coriaceous to smooth, shining, with scat- 

 tered hairs most prominent on disk, parapsidal grooves deep, smooth, 

 percurrent, no median; disk with transverse groove at base, sides 

 bounded by straight lines diverging behind. Carinae on propodeum 

 arcuate. Mcsopleura smooth. Tarsal claws with a tooth. Wing 

 hyaline, pubescent, ciliate, first abscissa of radius arcuate, radial 

 cell four and one-half times as long as broad, areolet and cubitus 

 indistinct, more distinct in dark specimens. Abdomen longer than 

 head and thorax, lengths of tergites along dorsal curvature as 

 62: X3:'lj6:20:C:8, second pubescent on sides, hind margin ixot 

 oblique, ventral spine slender, in side view five times as long as 

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

 ratio is 1.4, antenna 2.6, ovipositor 3.3, wing 4.9. Length, 1.6-2.1 

 mm. Average of 8 specimens, 1.88 mm. 



On account of the shape of the second tergite this species is not 

 strictly congeneric with the genotype of this genus but at present 

 there seems to be no better place to put it. 



Type.— C2it. No. 27190, U.S-N.M. Type and 2 paratypes. Para- 

 types in American Museum, Field and Stanford. 



Host. — Quercus undulata. 



Gall (figs. 6 and 33). — A thin disk, 3.6 mm. in diameter on the 

 under side of the leaf in the fall. Monothalamous, tan-colored, con- 

 vex on upper surface, margin crenate, underside concave, the trans- 

 versely placed larval cell occupying the full height of the gall. Exit 

 hole on upper surface. Single or but few on a leaf. 



