20 PROCEEDINGS OF THE NATIONAL, MUSEUM. vol. Gl. 



found dead in the cage the next May. The species pupates in De- 

 cember, the adults remaining in the galls until the next spring. 



CALLIRHYTIS FLORA, new species. 



Female. — Reddish-brown ; abdomen nearly black posteriorly. Head 

 coriaceous. Interocular space 0.58 transfacial and area 1.3 times as 

 broad as high. Malar space 0.5 eye, with groove. Antennae slender, 

 14-segmented, lengths as (pedicel) 13:5: 12: 10:9: 8:7: 6:6: 6:6:6:6: 10. 

 Sides of pronotum rugose. Mesoscutum broader than long ; slightly 

 rugose behind between parapsides; parapsidal grooves complete. 

 Scutellum coarsely rugose, not margined, with two indistinct rugose 

 pits at base. Carinae on propodeum bent slightly outward ; spiracu- 

 lar areas smooth. Fore wing with normal browm venation; both 

 cross veins clouded and areolet reaching about one-sixth way to 

 basal ; surface short brown pubescent; margin not ciliate. Hind tar- 

 sus shorter than tibia ; tarsal claws weak, simple. Abdomen shorter 

 than head and thorax, as broad as long; all tergites visible on dorsal 

 margin; ventral valves almost vertical; ventral spine scarcely as 

 long as broad ; ovipositor exserted. Using width of head as a base, 

 the length of mesonotum ratio is 1.1; antenna, 1.2; wing, 3.2; ovi- 

 positor, 9.3. 



Range in length of 10 specimens, 1.5-2.3 mm. ; average, 2 mm. 



Type.— Cat. No. 24726, U.S.N.M. Type and seven paratypes. 



Host. — Quercus tvislizeni 



Gall. — An abrupt smooth and polished swelling of the midrib on 

 the under side at the base of the leaf blade and rarely extending half 

 the length of the leaf, 10-30 mm. long by 6-9 mm. in diameter; 

 polythalamous, hard. 



Hahitat. — The type locality is Mount Tamalpais, Marin County, 

 California, where galls were collected May 25, 1918. Galls were 

 also collected at Camp Baldy June 15. In both cases flies issued and 

 died in the packets before August 14. The galls were seen also at 

 Bagby, Los Gatos, and Santa Margarita. The new galls start to 

 develop in April and are full grown in about a month. A similar 

 gall occurs on Q. agrifolia, and when reared it will probably prove 

 to be caused by this species. 



CALLIRHYTIS GEMMARIA (Ashniead). 



This species, described from Florida, has been reported in the 

 literature from New Jersey and Ontario. The writer has seen the 

 galls in Florida at Jacksonville, Gainesville, Marianna, River Junc- 

 tion, Carrabelle, Madison, St. Petersburg, Clearwater, Miami, Day- 

 tona, and Green Cove Springs; in Maryland on Plummer Island; 

 in District of Columbia; in Virginia at Falls Church and Bluemont; 



