18 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



by sweeping, determined by the writer as this species and these aver- 

 age 2.52 mm. One specimen of what is apparently ft^ticola was 

 reared from similar galls in the acorns of Quercus texan<i Buckley 

 collected at Boerne, Texas. October 25, 1917, giving a second host for 

 this species. The fly emerged in May, 1920. It is probable that 

 fi'uticoTa has other hosts among the red oaks. The United States 

 National Museum has one specimen from New Boston, Texas, cap- 

 tured March 28, 1907, by F. C. Bishopp. The Biological Survey has 

 three specimens: Falls Church, Virginia, April 30 (E. A. Chapin) ; 

 Plummer Island, Maryland, April 28 (L. O. Jackson) ; Dead Run 

 Swamp, Fairfax County, Virginia, April 20 (W. L. McAtee). 



CALLIRHYTIS LAPILLULA. new species. 



Plate 2, figure C. 



Female. — Thorax reddish-brown, face, antennae, legs and base of 

 abdomen honey-yellow, distal two-thirds of abdomen becoming al- 

 most black. Head slightly wider than thorax, finely pebbled, seen 

 from in front elliptical with facial about .75 transfacial and inter- 

 ocular area 1.0-1.1 times as broad as high; seen from above thickness 

 .43 width, barely broadened behind eyes, ocellocular space greater 

 than antennocular. malar space at least .3 eye and with parallel 

 ridges, mandibles 2-toothed, palpi 5- and 3-segmented, antennae 14- 

 segmented, first longest, third and fourth subequal. 5-13 gradually 

 shorter, last about twice preceding and infuscated. Pronotum reticu- 

 late. Mesoscutum slightly broader than long, coarsely transversely 

 rugose all over, parapsidal grooves deep, broad, percurrent, their 

 separation behind less than that of the faint parallel lines, lateral 

 lines faint, no median. Scute! lum coarsely rugose, with two large, 

 smooth, pear-shaped pits at base, triangular impressions on sides. 

 Propodeum with many ridges radiating from rugose peduncle, the 

 usual carinae parallel, inclosing a space broader than long with 

 trace of a median. Mesopleura rugose, the ridges across middle 

 almost parallel. Hind tarsus shorter than tibia, second and fifth 

 subequal, claws simple. Wing hyaline, veins pale, yellowish, areolet 

 faint, surface short, pubescent, margin not ciliate. Abdomen longer 

 than broad, slightly compressed, second tergite occupying .6 length 

 and with sparse pubescent patches at base, ventral spine not twice as 

 long as broad, ovipositor when dissected out nearly 1.5 times length 

 of antenna. Using width of head as a base the length of mesonotuni 

 ratio is 1.2-1.3. antenna 1.9-2.2. ovipositor 2.6-3-4, wing 3.5. 



Range in length of 104 pinned specimens 1.8-3.0 mm. Average 

 2.4 mm. 



Type.—Q^X. No. 6421, U.S.N.M. Fifty cotypes. Cotypes also in 

 Carnegie Museum, Pittsburgh, Pennsylvania. 



Host. — Quercus Ijicolor Willdenow. 



