20 PROC. EJNT. soc. WASH., VOL. 22, NO. i, JAN., 1920 



29, 1914, V. Roberts; Beltsville, Md., September 10, 1916, River- 

 dale, Md., June 16, 1916, F. R. Cole; Chevy Chase Lake, Md., 

 July 22, 1917, McAtee; Washington, D. C., July 11, 1899, J. S. 

 Hine; Falls Church, Va., July 15, 20, August 2; Glencarlyn, Va., 

 July 25, Banks. 



Holopogon Loew. 



H. guttula Wiedemann. Fairly common; usually found sit- 

 ting on the ends of dead twigs; known to come to light. Season 

 May 25 to July 16; in copula, June 15. P. I. 



Heteropogon Loew. 



H. macerinus Walker. Difficult Run, Va., September 3, 1911, 

 F. Knab; Turkey Island, Md., August 23, 1914, R. C. Shannon; 

 Cabin John Bridge, Md., August 22, 1909, F. Knab; Falls Church, 

 Va., August 27, September S, 12, IS, October 1, Banks; Septem- 

 ber 5, 1912, C. T. Greene. 



Stichopogon Loew. 



S. trifasciatus Say. On sand and rocks; Great Falls, Va., 

 July 8 and 29, Banks; Difficult Run, Va, July 25, 1915, in copula; 

 Plummers Island, Md., July 14, 1915, McAtee; Washington, D. 

 C., July 11, and September 5, 1899, T. S. Hine; Bladensburg, 

 Md., June 23 and July 17, 1916, R. C. Shannon. 



Deromyia Phillippi. 



Key to the Species. 



A. Pronotal bristles pale; dorsum of thorax with three deep velvety black 

 stripes; lateral stripes interrupted, median one merging into red an- 

 teriorly winthemi. 



AA. Pronotal bristles dark; thoracic stripes not velvety black. 



B. Hair on coxae pale; general color of abdomen reddish yellow, discolor. 



BB. Hair on coxae partly black; general color of abdomen reddish brown 



umbrina. 



D. discolor Loew. Common; June 24 to September 16; in 

 copula July 25, August 5, 20, 22. Among the prey have been 

 identified the digger wasp, Mimes a kohli, the paper wasps, Ves- 

 pula vulgaris, V. communis and V. germanica, and the bees, 

 Apis mellifera and Clisodon terniinalis. P. I. 



D. umbrina Loew. Less common than last, but not rare; has 

 been collected from July to September 19. In copula, September 



1. Has been found preying upon a spider, and the bees, Apis 

 mellifera and Bremis impatiens. P. I. 



D. winthemi Wiedemann. Kalmia Road, D. C., September 



2, 1916, McAtee; Falls Church, Va., July 29, August 19, Banks; 

 August 4, 1913, W. Middleton; Beltsville, Md., September 10, 

 1916, devouring a house fly, F. R. Cole. Diogniitcs miscllus 

 Loew described from District of Columbia material is a svnonvm. 



Actual date of publication January 23, IQ2O. 



