ART. 12 KEYS TO SAPEOMYZIDAE MALLOCH AND McATEE. 19 



LIST OF SPECIES OF THE DISTRICT OF COLUMBIA REGION. 



S. annvlata Melander. — Fairly common in Piedmont areas; has 

 been taken at Diflficult Kun, Virginia, September 14, 1913, R. C. 

 Shannon; on Phimmer Island, Maryland, June 8, 1914, at light. 

 June 14, 1913, and July 31, 1913, R. C. Shannon; May 30, 1907, and 

 June 7, 1914, McAtee, August 3, 1915, at light, V. A. Roberts; at 

 Glen Echo, Maryland, at six dates extending from July 10 to 

 August 28, Malloch; May wood, Virginia, May 21, 1922, McAtee; 

 and Beltsville, Maryland, May 21, 1922, Malloch. 



aS. hrachysoma Coquillett. — Stubblefield Fall, Virginia, October 

 23, 1921, Malloch; Dead Run, Virginia, March 13, 28, 1915, March 

 12, 1916, March 13, 1922; April 4, 1915; and Maryland near Plummer 

 Island April 5, 1914, R. C. Shannon. 



* S. ohtnsilamellata Malloch. — Glen Echo, Maryland, July 17, 

 23. 1921, June 11, 1922; Cabin John, Maryland, July 31, 1921. 

 Malloch. 



* S. pictiventris Malloch. — -Fairly common ; the season as at present 

 known extends from April 23 to August 24. P. I. 



'S. quadrilineata Loew. — Very common ; extreme dates of collection 

 are April 24 and September 23; comes rather frequently to light. 

 P.I. 



* S. serrata Malloch. — District of Columbia, D. W. Coquillett : 

 Rock Creek, District of Columbia, June 15, 1913, R. C. Shannon; 

 Glen Echo, Maryland, June 1, 18, 25, July 2, 9, 1922, Malloch. 



* 8. umbrosa Loew. — Plummer Island, Maryland, June 8, 1914, 

 at light, E. A. Schwarz and R. C. Shannon; Glen Echo, Mary- 

 land, June 25, July 2, 1922, Malloch; Beltsville, Maryland, June 

 23, 1918, July 4, 1915, McAtee; June 25, 1915, R. C. Shannon; May 

 21, 1922, Malloch; Odenton, Maryland, June 20, 1915, June li. 

 1922, McAtee. 



kS. vittigera Coquillett. — Stubblefield Fall, Virginia, October 23, 

 1921; Glen Echo, Mainland, June 11, 1922, Malloch. 



Genus SAPROMYZOSOMA Malloch. 



KEY TO SPECIES. 



1. AVings with at least both cross-veins and the apices of second, third. 



and fourth veins distinctly infuscated 2 



Wings with at most the cross-veins distinctly infuscated - 16 



2. Third vein with two fuscous spots in addition to the one at inner cross- 



vein and the one at apex ?, 



Third vein with only one fuscous spot in addition to the one at inner 

 cross-vein and the one at apex 



