No. 2368. AMERICAN SUBTERRANEAN GALLS OX OAK—WELD. 197 



basal along prolonged axis of cubitus, cubitus reaching at least two- 

 thirds distance to basal, surface pubescent, margin ciliate, first and 

 second cross-veins slightly clouded. ' Abdomen smooth and shining, 

 longer than high, second segment making three-fourths with well- 

 separated large pubescent patches on sides, ventral spine tapering, in 

 balsam three times as long as broad, ovipositor when dissected out 

 longer than antenna, Using width of head as base, the length of 

 mesonotum ratio is 1.4-1.5; antenna, 2.5-2.7; ovipositor, 3.4; wing, 

 4.6-4.8. 



Length of 28 pinned specimens, 2.3-5.0 mm. Average, 4.0 mm. 



This species is close to Disholcaspis globulus (Fitch) from which it 

 may be separated by the following contrasts: 



globosa. 

 Clypeus distinctly emarginate. 

 Head rounded laterally. 

 Ratio transfacial to facial line less than 



1.5. 

 Well developed black spot on disk. 

 Areolet reaching one-fourth way to basal. 

 Cubitus reaching two-thirds way to basal. 



globulus. 

 Clypeus almost truncate. 

 Head somewhat angular. 

 Ratio between 1.5 and 1.6. 

 Only trace of spot on disk of scutellum. 

 Areolet reaching one-sixth to one-fifth 



way. 

 Cubitus reaching one-half way to basal. 



Type.— Cat. No. 22576, U.S.N.M. Fourteen cotypes. 



Host. — Quercus alba Linnaeus. 



Gall. — Similar to those of Disholcaspis globulus (Fitch) in appear- 

 ance, but less regular in shape and dark red or sometimes yellowish. 

 They occur in clusters at base of 2-3-year-old sprouts from stumps 

 and are almost always hidden by debris. Scattering small ones are 

 sometimes seen exposed a few inches above the surface. They are 

 closely crowded together about the base of sprouts and there may be 

 from two or three to as many as forty in the cluster. Each is 8-12 

 mm. in diameter, the interior spongy, with a distinct thin inner shell. 



Type locality. — Fort Sheridan, Illinois. The writer has also col- 

 lected these galls at Highland Park, Ravinia, Evanston, Glen Ellyn, 

 and New Lenox, Illinois; at Ithaca, New York; and at Tuskahoma, 

 Oklahoma. About Chicago the galls have been found containing 

 pupae on September 12, and with adults October 3. Adults emerge 

 in the late October and early November. At Ithaca pupae were 

 found as early as September 1. The American Museum of Natural 

 History has galls from Bartow, New York, collected by E. B. South- 

 wick. 



Note. — Similar galls were collected on Quercus prinus Linnaeus at 

 East Falls Church, Virginia, August 31, 1919, and contained pupae 

 September 13. 



4. DISHOLCASPIS BREVINOTA. new species. 



Agamic female. — Red; eyes, ocelli, area inclosing parallel lines, 

 areas inclosing lateral lines black, propodeum, base of scutellum and 

 dorsal part of abdomen infuscated. Head finely rugose, malar space 



