188 Proceedings of the Biological Society of Washington. 



Glencarlyn, Va., May 7 to 18, 1913, Greene; May 9, Banks; Falls Church, 

 Va., May 26, 1913, May 31, 1914, Greene; May 25 and June 30, Banks; 

 Mt. Vernon, Va., June 4, 1916, McAtee. The larvae of the rat-tail type 

 have been found in pockets in living chestnut tree, Greene. 



Merodon Meigen. 



M. EQUESTRis Fabricius. — This species frequently has been bred from 

 material held up for inspection in the greenhouses and insectary of the 

 Department of Agriculture. One specimen however is labeled simply, 

 Washington, D. C., August 4, 1907. The lack of indication that it is a 

 bred specimen makes it probable that the specimen was captured in the 

 free state. Moreover, the records of the Bureau of Entomology do not 

 show that any files of this species were bred at any date near that given. 



Teuchocnemis Osten Sacken. 



T. BACUNTius Walker. — Great Falls, Va., April 28, 1915, Greene; April 

 30, rests on dead leaves in moist spots in woodland, Banks ; Dead Run, 

 Va., May 19, 1916, Shannon; Beltsville, Md., May 8, 1916, C. H. T. 

 Townsend. 



T. LiTURATus Loew. — Plummers Id., Md., April 14, 1906; April 10 and 

 14, 1910, A. K. Fisher; Falls Church, Va., April 25, 1913, Greene; May 

 1 ; Great Falls, Va. , April 30, Banks. Sometimes rests on oak bark. 



Pterallastes Loew. 



P. THORACicus Loew. — Plummers Id., Md., June 30, 1907, A. K. Fisher; 

 Virginia opposite Plummers Id., September, 1909, J. C. Crawford; Offuts 

 Id., Md. , September 8, 1914, Shannon; Falls Church, Va., August 30, 

 1912; August 19, 1913, Greene; July 13, 1913, F. Knab; June 14, July 24, 

 and September 7, Banks; Great Falls, Va., October 3, 1915, McAtee; 

 Glencarlyn, Va., June 14, October 4; Beltsville, Md., June 9, Banks; 

 July 4, 1916, McAtee. Rests on foliage near ground in sunny places. 



Syritta St. Fargeau and Serville. 



S. PiPiENS Linnaeus. — Everywhere, April 14 to October 26; in copula, 

 July 9 ; often about or on flowers. 



Xylota Meigen. 



X. ANGUSTivENTRis Locw. — Beltsvillc, Md., May 28, 1916, McAtee; July 

 6, 1916, F. R. Cole; Plummers Id., Md., May 23, 1914; Maryland oppo- 

 site Plummers Id., July 25, 1914, Shannon; Virginia near Plummers Id., 

 Md., June 18, 1916, H. L. Viereck; Dead Run, Va., July 18 and 25, 1916, 

 Shannon; Four Mile Run, Va., May 30, 1910, F. Knab; Glencarlyn, Va., 

 June 5 ; Falls Church, Va., June 14, July 17, and 24; Great Falls, Va., 

 May 25 and July 21, Banks. This species and X. elongata sometimes 

 rest on the inner leaves of bushes, where it is extremely difficult to get 

 them. 



X. ANTHREAs Walker, — Beltsville, Md. , July 30, 1916, flowers of Ceph- 



