ART. 10 GALL-INHABITING CYNIPID WASPS WELD 73 



as broad, areolet reaching one-seventh and cubitus one-half ^xily to 

 basal. Hind tarsus shorter than tibia, its segments as 25 : 11 : 7 : 5 : 12, 

 claws Avith a tooth. Abdomen as long as head and thorax, length 

 to height to width as 25 : 21 : 15, lengths of tergites along dorsal 

 margin as 57:18:8:4, all highly polished, second with patch of hair 

 on each side at base, ventral spine slender, bare, in side view six times 

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

 notum ratio is 1.3, antenna 2.2, ovipositor 3.5, wing 4.0. Length, 

 2.0-3.3 mm. Average of 29 specimens, 2.58 mm. 



Ti/pe.— Cat. No. 27210, U.S.N.M. Type and 10 paratypes. Para- 

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

 delphia Academy. 



Host. — Quercus hicolor. 



Gall (fig. 15). — A small ellipsoidal deciduous bud gall on small 

 twigs in the fall. Greenish-gray with longitudinal purple streaks, 

 the surface pebbled under lens, 4.5 mm. long by 4 mm. in diameter, 

 slightly pointed at apex with a heart-shaped base when detached 

 in which is a round impressed scar. They are found in September, 

 produced usually from one of the small lateral buds near the base 

 of the current season's growth but sometimes occur as far back as 

 on five-year-old wood, very rarely from a small bud in the terminal 

 cluster on a weak branch. About the end of September they drop 

 to the ground and the thin fleshy layer decays leaving a longi- 

 tudinally ribbed hard thin-walled shell with a large larval cavity. 



Habitat. — The type material was collected at Wilmette, 111., Sep- 

 tember 10, 1917. Opened some of the galls September 3, 1918, and 

 found living adults and left the rest to emerge naturally, which they 

 did by April 10, 1919. These same galls were seen at Evanston, 

 Winnetka, Ravinia, and Fort Sheridan. 



ANDRICUS EXCAVATUS Ashmead 



Galls agreeing with the types of this species on red oak, Q. max- 

 ima have been seen at New Lenox, Illinois on Q. imhncaria; at Iron- 

 ton, Missouri on Q. velutina; at Mineola, Texas on Q. marilandica; 

 and at "Washington, D. C., on Q. maxima. No adults reared. 



ANDRICUS EXIGUUS Bassett 



This species has been reared from flower galls on Q. steUata at 

 Washington, D. C., the flies emerging May 11, 1914, and in 1920 on 

 May 9. The same species of adults was also reared from galls col- 

 lected at Rosslyn, Va. In both cases the collection yielded flies of 

 a Neuroterus and the writer has not definitely associated the 

 Andricus with the gall from which it came. 



G072G— 26 G 



