ART. 10 GALL-IXHABITING CYNIPID WASPS WELD 69 



occiput concave, cheeks broadened behind eyes; from in front 

 widest above level of antennae, facial area one and six-tenths times 

 aa broad at high, malar space half eye with fine radiating ridges 

 on either side of clypens, antennae 13-segmented, length as (scape) 

 18 (AvidthT) :9 (5): 21: 15: 12: 10:8 : 8: 8: 7: 7: 7: 12 (6). Thorax 

 sparsely pubescent, bare spot on mesopleura? and between parap- 

 sides behind. Pronotum with den.ser white pubescence, parallel 

 I'idges on sides. Mesoscutum coriaceous, the setigerous punctures 

 not prominent, parapsidal grooves narrow, smooth, not quite reach- 

 ing pronotum, separation behind four times width of groove, lat- 

 eral lines smooth, anterior indistinct. Scutellum pubescent, rugose, 

 the two widely separated pits at base opening out on to disk behind. 

 Carinae on propodeum almost straight, bent in above and out below, 

 enclosing area as high as broad. Tarsal claws with a tooth. Wing 

 hyaline, pubescent, ciliate, veins beyond second cross-vein pale, 

 second abscissa of radius angled, areolet reaching one-fifth way to 

 basal, cubitus indistinct. Abdomen shorter than head and thorax, 

 length to height to width as 29 : 28 : 18, lengths of tergites along 

 dorsal curvature as 80 : 20 : 7 : 1 : : 12, second with hairy patches 

 at base, ventral valves oblique but scarcely protruding, ventral spine 

 tapering, in side view five times as long as broad, nearly horizontal. 

 Using width of head as a base the length of mesonotum ratio is 

 1.3, antenna 1.7, ovipositor 3.1, wing 3,6. Length, 2.5-3.75 mm. 

 Average of 200 measured specimens, 3.19 mm. 



Typ€.—C2it. No. 27208, U. S. N. M. Type and 89 paratypes. 

 Paratypes in American Museum, Field, Stanford, Harvard, and 

 Philadelphia Academy. 

 Host. — Quercus ateUata. 



Gall (fig. 13). — Cluster at base of petiole of leaf in autumn. The 

 clusters consist of as many as 20 individual galls which are closely 

 jjacked, the basal half of each more or less distorted by mutual 

 pressure. The individual galls are spindle-shaped, with pyramidal 

 base and conical apex, up to 8 mm. long by 5 mm. in diameter, 

 brownish, covered with stellate hairs, dropping when mature. 

 ]\fonothalamous, consisting almost entirely of nutritive material in 

 Vihich a larval cavity is scarcely evident when the galls drop. When 

 the larvae finish feeding the wall left is only about 0.2 mm. thick. 

 Diameter of exit hole 1.2 mm. This is the gall described by Wells.^ 

 Hahitat. — The types were reared from galls collected in fall and 

 winter of 1919 at Denton, Tex., by R. L. Marquis (Hopkins U. S. 

 Xo. 107G7<^'^). A gall opened on November 7, 1920, contained a pupa 

 which transformed November 12 and adults issued (at Washington) 

 before :March 12, 1921. 



» Psyche, vol. 28, 1021, p. 44, fij;. 27. 



