,^RT. 10 GALL-IXHABITING CYNIPID WASPS WELD 21 



six infuscated and forming a slight club. Sides of pronotiim dull 

 with fine setigerous punctures. Mesoscutuni microscopically coriace- 

 ous and polished except where sparsely pubescent anteriorly, parap- 

 sidal grooves deep, smooth, percurrent, widely separated behind, no 

 median. Scutellum finely rugose, transverse groove in front limited 

 laterally and opening on to disk which is smoother anteriorly. 

 Carinae on propodeum straight, diverging slightly below and 

 slightly angled near the neck. Mesopleura polished. Hind tarsal 

 segments as 23 : 8 : 5 : 4 : 11 (with claw 16) . Claws with tooth. Wing 

 hj'aline, pubescent, ciliate, veins brown but not heavy, second abscissa 

 of radius heaviest, slightly angled, areolet reaching one-ninth way 

 to basal, radial cell four times as long as broad. Abdomen longer 

 than head and thorax, oval and oblique in side view, longest length 

 to height to width as 26 : 21 : 12, lengths of tergites along dorsal 

 curvature as 34 : 12 : 8 : 10 : 15 : 7, second with pubescent areas at base 

 and hind margin at angle of about 75°, ventral valves oblique, tips 

 projecting, ventral spine long, slender, in side view horizontal, nine 

 times as long as broad. Using width of head as a base the length of 

 mesonotum ratio is 1.25, antenna 2.3, wing 4.4 Length, 1.9-2.4 mm. 

 Average of 6 specimens, 2.2 mm. 



This species does not strictly belong in this genus on account of 

 structure of propodeum and abdomen. 



Type.— Cfit. No. 27188, U.S.N.M. Type and four paratypes. 

 Paratypes in American Museum, also in Field Museum and Stan- 

 ford University. 



Host. — Quercus alba. 



Gall (fig. 4). — Cluster of 2-12 on midrib on under side of leaf in 

 fall, usually on the lower leaves of strong sprouts from stumps. The 

 individual galls are whitish or tan-colored, somewhat globular, 2-3 

 mm. in diameter, but slightly distorted by mutual pressure, covered 

 with sparse short pubescence which does not hide the outline of 

 the gall. 



Habitat. — The type material was collected at Fort Sheridan, 111., 

 October 3, 1914. Xothing emerged before September, 1915, but when 

 the breeding cage was next examined on November 2, 1915, six dead 

 adults were found in the cage and a gall contained a full-grown 

 larva, and a larva was found when another gall was opened June 2, 

 1916. The galls were also seen at Highland Park, 111. ; Kimmswick, 

 Ironton, and Poplar Bluff, Mo. ; Hot Springs and Texarkana, Ark. ; 

 Bluemont, Va., and Washington, D. C. A similar gall without the 

 long scattered hairs was observed on Q. niontanfi at Washington and 

 Bluemont. Galls collected at East Falls Church, Va., in October, 

 1923, gave adults December 12, 1924. A series of eight of these aver- 

 aged 3.2 mm. in length and they are included as paratypes. 



