190 Proceedings of the Biological Society of Washington . 



X. suBFASCiATA Loew. — Washington, D. C, April 15, 1910, A. Busck ; 

 Bladensburg, Md., September 23, 1915; Dead Run, Va., May 23 and 27, 

 1915; June 19, 1915; Marcli 13, 1915, April 3, 1915, on maple log. 

 Shannon ; Falls Church, Va., June 28; Glencarlyn, Va. , June 16, Banks. 

 Very close to X. ejuncida, but differs in shape of abdominal marks, in 

 the color of arista, and of the front. 



Chrysochlamys Rondani. 



C. DIVES Osten Sacken. — Plummers Id., Md., August 11, 1912, McAtee; 

 June 19, 1913, Shannon; Veitch, Va., June 14, 1912, at sap on trunk of 

 chestnut, Greene; Falls Church, Va., July 18, Banks. Very possibly 

 this may prove to be the C. buccata Loew. 



Brachy palpus Macquart.* 



B. FRONTosus Loew. — Originally described from the District of Columbia; 

 Plummers Id., Md., April 14, 1914; Shannon; April 20, 1916, H. L. 

 Viereck ; Dead Run, Va., April 11 and 18, 1915, Shannon; Cabin John 

 Bridge, Md., April 28, 1912, F. Knab; Vienna, Va., April 14, 1915, on 

 Benzoin aestivale, J. C. Crawford ; April 11 and 14, 1915, on willow, 

 R. A. Cushman; Falls Church, Va., April 3, 1913; April 25, 1913, and 

 April 11 to 25, 1914, Greene; April 12 and 18; Great Falls, Va., April 

 15, Banks. Adults rest on tree trunks ; a female was seen to deposit eggs 

 on water, in pocket of living chestnut, Greene. 



B. RiLEYi Williston.— Great Falls, Va., April 20, 1916, McAtee; Dead 

 Run, Va., March 1 and 2; April 4, 1915, on rotten log in swamp; March 

 21 and 24, 1916, April 11 and 24, 1915, common, resting on an oak log 

 lying in small sphagnum swamp, Shannon. Pupae have been found in 

 frass in an insect gallery in cedar, Greene. 



Merapioidus Bigot. 



M. viLLOsus Bigot. — Dead Run, Va., March 13 and 14, 1915, at sap of 

 sugar maple, March 24, 1916, Shannon ; March 18, 1915, at sap on beech 

 trunk and on sugar maple, Greene; Plummers Id., Md., March 14, 1915, 

 on red maple flowers, McAtee; Falls Church, Va. , March 14, on fresh 

 cut maple stump, also on maple flowers and resting on beech trunk, 

 Banks. 



Criorhina HoS'mannsegge. 



C. VERBOSA Harris. — Falls Church, Va., April 3, 1913; April 6, 1916, 

 Greene; resting on maple blossoms. 



Blera Billberg. 



B. BADiA Walker.— Plummers Id., Md., June 20, 1916; Dead Run, Va., 

 May 23, 1915, May 24, 1916, June 20, 1916, July 9 and 29, 1915, around 

 chestnut logs and resting on leaves in partial shade. Shannon. 



* For a key to the species of Brachypalpus see appendix, pp. 202-203. 



