Banks, Greene, McAfee, and Shannon — Dist. of Col. Dlptcra. 179 



P. FESTivA Meigen.— Falls Church, Va., May 24, Great Falls, Va., 

 June 21, Banks; May 2, 1916, McAtee; Dead Run, Va., May 9 and 19, 

 1916, Shannon; June 28, Banks; Rosslyn, Va., May 11, 1913, Shannon; 

 Plummers Id., Md., April 21, 1907, May 10, 1916, on flowers of butter- 

 cup, McAtee; Maryland near Plummers Id., May 8, 1915, J. C. Crawford; 

 Cabin John, Md., April 29, 1916, Shannon. 



P. NiGRiPiLOSA Williston. — Cabin John Bridge, Md., April 28, 1912, 

 F. Knab and J. R. Malloch ; Dead Run, Va. , April 24, 1915, Shannon; 

 Falls Church, Va., September 5, Banks; Virginia near Plummers Id., 

 Md., June 2, 1916, McAtee; June 4, 1916, H. L. Viereck ; Plummers Id., 

 Md., May 10, 1916, McAtee. 



P. pisTicA Williston. — Great Falls, Va., August 11, 1915, McAtee; 

 Plummers Id., Md., April 28, 1914, April 29, 1916, Shannon; May 10, 



1914, J. C. Crawford, on flowers Sedum ternatum ; May 19, 1914, at light, 

 Maryland near Plummers Id., August 29, 1915, Dead Run, Va., May 21, 

 1916, June 19 and iVugust 29, 1915, Shannon; Glencarlyn, Va., June 7 

 and 30, Banks. The last-named specimens are females; males taken at 

 Falls Church, Va., August 23 agree with P. pubescens Loew and P. pistica 

 may be this species. P. radicum Walsh is an older name, but P. modesta 

 Loew is doubtless the same and still older. 



P. PiSTicoiDES AVilliston. — Chain Bridge, Va., May 23 and 28, Great 

 Falls, Va., April 27 and 30, May 25, and June 12, Banks; September 25, 

 1913, Shannon; Falls Churcli, Va., September 1, Banks; Beltsville, Md., 

 April 30, 1916, McAtee. 



P. PULCHELLA Williston. — Falls Church, Va., May 3, 10, and 23, June 

 14, and August 17; Great Falls, Va., May 25, Banks (these are all 

 females; two males from Falls Church, in May, agree with P. nigribarba 

 Loew, which I think is the same species, Banks); Bladensburg, Md. , 

 June 23, 1916, Shannon. 



Chilosia * Meigen. 



C. CAPiLLATA Loew. — Originally described from the District of Colum- 

 bia. Anacostia, D. C, May 4, 1913, P. R. Myers; Plummers Id., Md., 

 April 16, 1915, swarming above small tree tops. Shannon; Maryland near 

 Plummers Id., April 16, 1916, H. L. Viereck; Dead Run, Va., April 18, 



1915, Shannon; Great Falls, Va., April 20, 1916; Mount Vernon, Va., 

 April 18, 1916, McAtee. 



C. CYANESCENS Loew. — Cabin John Run, Md., June 29, 19J6, F. R. 

 Cole. 



C. PALUPES Loew. — Originally described from the District of Colum- 

 bia. Plummers Id., Md., June 15, 1915, Shannon; Dead Run, Va., July 

 25, 1915, Shannon; August 19, 1916, H. L. Viereck; Virginia near Plum- 



*For a key to local species of Chilosia, synonymy of C. tristis, and description of 

 C. similia, see Appendix, pp. 196-198. 



