30 PROC. ENT. SOC. WASH., VOL. 22, NO. 2, FEB., 1920 



P. Each femur with orly preapical band red. 



Q. Underside of each fro it femur with abundant rather long 



hair, not in rows snowii. 



QQ. Underside of each front femur with a row of bristles. 



R. Bristles nale and weak; male forceps seen from side 



widest at two-thirds their length. . . .erythrocnemius. 



RR. Bristles stout, black, male forceps of about the same 



width throughout paropus. 



PP. Each femur with preapical band and posterior side red; thor- 

 acic stripe very distinct johnsoni. 



OO. Arista as long or longer than third antennal joint. 

 S. Mystax chiefly golden. 

 T. Male forceps widest beyond middle; legs chiefly yellow 



auricomus. 



TT. Male forceps not widest beyond middle; lee;_> chiefly black 



i^.-ythrocnemius. 



SS. Mystax either black, white or mixed. 



U. Mystax chiefly white; third antennal joh.t barely pale at 



base antimachus. 



UU. Mystax with numerous black hairs above; third antennal 

 joint distinctly pale at base lecythus. 



A. augustipennis Hine. Among the material from which this 

 species was described, was a male from St. Elmo, Va., F. C. 

 Pratt. Has been taken also near Beltsvilte,. Md., September TO, 

 1916, in copula, McAtee. 



A. auricomus Hine. Great Falls, Va., September 9, 1914, R. 

 C. Shannon; October 3; Falls Church, Va., August 13, Banks; 

 Rock Run, Md., September 7, 1915, R. 0. Shannon. 



A. autumnalis Banks. Common; August 10 to September 30; 

 in copula September 13; known to come to light; mry be a fall 

 form of A. novaescotiae. P. I. 



A. erythrocnemius Hine. Great Falls, Va., July 20.. 1913, F. 

 Knab; Falls Church, Va., September 22, "Bryant "B^nks, Silver 

 Hill, Md., September 26, 1915, I,. O. Jackson. 



A. flavofemoratus Hine. Abundant; May 12 to July 25; lias 

 been observed coming to light in great abundance; known to feed 

 on Elateridae, and the diptera, Chrysopila sp. and Tipula sp. 

 P. I. 



A. fuscatus Hine. Fairly numerous; June 6 to September 2. 

 P. I. 



A. gracilis Wiedemann. Plummers Island, Md., September 1, 

 H. S. Barber; Rock Creek, D. C., August 25, 1914, R. C. Shannon. 



A. johnsoni Hine. Beltsville, Md., July 9, 1916, McAttf. 



A. latipennis Hine. Plummers Island, M f l., September 1, 1907, 

 A. K. Fisher. 



