20 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



wardly, inclosed area broader than high. Mesopleura striate, pubes- 

 cent above and below. Hind tarsus shorter than tibia, second shorter 

 than fifth, claws simple. Wing hyaline, veins brown, first abscissa 

 of radius rounded, areolet reaching one-sixth and cubitus half way 

 to basal, surface short pubescent, margin not ciliate. Abdomen 

 longer than broad, not compressed, second tergite occupying nearly 

 four-fifths length and with sparsely pubescent patches at base, its 

 hind margin and exposed parts of others microscopically punctate, 

 ventral spine in balsam 2.5 times as long as broad, ovipositor when 

 dissected out slightly longer than antenna, ovarian eggs well de- 

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

 ratio is 1.34, antenna 2.4, ovipositor 2.6, wing 3.5. 



Length of two pinned specimens, 3. 2 mm. each. 



Type.— Csii. No. 6422, U.S.N.M. Type female. 



Host. — Quercus coocinea Muenchhausen. 



ffall. — Found in spring on the immature acorns of the previous 

 season, pushing out from within the cup and stunting the acorn. 

 When growing in early spring they are fleshy, smooth, greenish, 

 mottled with purple, flattened, and blunt at apex. Avliorc they secrete 

 honeydew in such quantities that it often drips to the ground. They 

 become full grown just as the buds are swelling. After they drop to 

 ground in May the thin outer fleshy layer either shrinks up or de- 

 cays away. The simple thin-walled larval cell inside is relatively 

 large and transversely placed. 



Habitat. — The type locality is Fort Sheridan. Illinois, where, on 

 June 16, 1917, galls were picked up from ground and a few had not 

 yet fallen from the tree. One fly emerged April 22 and another 

 May 11, 1918, and a pupa was cut out of a gall on September 1 

 (transforming to an adult by December 1, 1918), indicating that 

 transformation occurs in the fall and emergence in the spring, and 

 that the emergence is distributed over at least two seasons. Similar 

 galls have been seen on the same host in spring at Evanston, Win- 

 netka, Glencoe, and Ravinia, Illinois. 



CALLIRHYTIS CARMELEINSIS, new species. 



Plate 4, figs. 16-17. 



Female. — Pale buff, mesonotum, parts of head and of abdomen 

 and tips of antennae becoming cinnamon-buff with eyes, ocelli, tips 

 of mandibles, claws, part of propodeum and dorsal spot on second ter- 

 gite black. Head and thorax finely pubescent, but not hiding sculp- 

 ( ure. Head almost as broad as thorax, seen from in front widest above 

 middle, facial line .64 transfacial, interocular area 1.7 times as broad 

 as high, antennocular space less than ocellocular, malar space .6 eye 

 and with several parallel ridges, broadened behind eyes, thickness 



