26 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



Habitat. — The type locality is Washington, District of Columbia. 

 This gall Avas first called to the author's attention by Mr. J, C. Craw- 

 ford May C, 1914, when a large number of galls were collected on 

 the ground under a largo tree on the Mall between the Natural 

 History Building of the United States National Museum and the 

 Smithsonian Building. The author, however, failed to rear it. On 

 the same date Mr. William Middleton collected galls from same 

 tree. Adults emerged April 9 and April 16, 1915, and one April 

 17, 191G. These are recorded under Hopkins U. S. No. 12036. Mr. 

 Middleton had also collected galls under the same tree May 2 and 

 May 10, 1912, and pupae were found in the galls in September, 1913, 

 and adults in November, 1913. The flies emerged March 31, 1914. 

 The species evidently transforms in the galls that fall and adults 

 emerge the next spring, the emergence being distributed over two 

 seasons. Galls collected under same tree April 29, 1920, gave adults 

 in the latter half of March, 1921. The new galls on this tree began 

 to drop by April 15, 1921. 



CALLIRHYTIS BALANOPSIS, new species. 



riate 3, fig. S. 



Female. — Reddish-brown with black markings — eyes, about mouth, 

 areas inclosing lateral lines, anterior two-thirds of area between 

 parapsides, melathorax and propodeum, sternum, posterior two thirds 

 of abdomen. Head narrower than thorax, coriaceous, from above 

 twice as broad as long, from in front interocular space .6 transfacial 

 and area 1.5 times as broad as high, facial .64 transfacial, posto- 

 cellar longer than antennocular or ocellocular which are subequal, 

 malar space .4 eye and with groove, mandibles 2-toothed, palpi 

 6- and 3-segmented, antennae 14-segmented, lengths of first five as 

 23 : 9 : 18 : 17 : 13 and of last two as 7 : 13, 6-13 gradually decreasing 

 in length. Mesoscutum broader than long, coriaceous, with ap- 

 pressed pubescence not hiding sculpture, parapsidal grooves deep, 

 smooth and shining posteriorly, obliterated anteriorly, slightly con- 

 verging as they approach scutellum, anterior and lateral lines shin- 

 ing. Scutellum finely rugose, the transverse pits at base deep and 

 smooth, disk almost circular. Carinae on propodeum bowed out, in- 

 closed area broader than high. Hind tarsus equal to tibia, second 

 shorter than fifth, claws simple. Wing hyaline, subcosta and cross- 

 veins brown, others pale, first abscissa of radius angled, areolet reach- 

 ing about one-fourth and cubitus about three-fourths way to basal, 

 surface very short pubescent, margin not ciliate. Abdomen longer 

 then broad, laterally compressed, second tergite occupying .73 with 

 pubescent areas on sides, ventral spine prominent, horizontal, in 

 balsam nearly three times as long as broad, ovipositor when dis- 



