186 Proceedings of the Biological Society of Washington. 



Shannon; Great Falls, Va., April 30, flying near trunk of large tree, 

 Banks; Falls Church, Va., larvae under dead tulip bark in the late fall, 

 emerged the next spring, Greene. 



Volucelia Geoffroy. 



V. EVECTA Walker. — Numerous records. May 25 to July 23; occurs 

 around flowers. The variety snnguinea Williston also occurs (Beltsville, 

 Md., June 11-18, W. R. Walton). 



V. OBESA Fabricius. — Falls Church, Va., May 20, at Ceanothus ; Glen- 

 carlyn, Va., June 28, Banks. 



V. VESICULOSA Fabricius. — Plummers Id., Md., June 24, 1916; remains 

 of one in spider web in insectary, August 17, 1914, Shannon; Glencarlyn, 

 Va. , June 20, at Ceanothus, Banks; Clarke's Station near Rosslyn, Va., 

 July 11, 1913, Shannon; Washington, D. C, August 19, 1911, F. Knab. 



Sericomyia Meigen. 



S. CHRYsoToxoiDES Macquart. — Cabin John Run, Md. , October 10, 

 1915, J. Silver; Virginia near Plummers Id., October 5, 1913, Shannon; 

 Dead Run, Va., May 24, 1916, Shannon; Great Falls, Va., May 19, 1915, 

 McAtee; April 30, Banks; Beltsville, Md., June 9, 1915, McAtee. 



Eristalis Latreille. 

 E. AENEUS Fabricius. — Washington, D. C, September 18, 1914; Octo- 

 ber 4, 1915, Shannon; March 29, 1907; October 22, 1914, McAtee; No- 

 vember 14, 1914, L. O. Jackson; Dixie Landing, Va., Washington, D. C, 

 May, July, August, November, C. H. T. Townsend; Falls Church, Va., 

 August 2, and July, Banks. 



E. ARBUSTORUM Liunaeus. — Common everywhere; taken from April 4 

 to October 30; in copula, July 14, occurs on a great variety of flowers. 



E. BASTARD! Macquart. — Washington, D. C. , May 27, C. H. T. Town- 

 send. 



E. DiMiDiATUs Wiedemann. — Fairly common, season March 16 to Sep- 

 tember 23; on various flowers as those of shadbush, willow and wild 

 plum. 



E. PLAviPES Walker.* — Washington, D. C. , April 10, 1903; received 

 from A. A. Doolittle of the Washington High Schools. 



E. SAXORUM Wiedemann. — Beltsville, Md., July .30, 1916, on flowers of 

 Tofieldia racemosa, McAtee. 



E. TENAX Linnaeus. — Very common; taken everywhere and in every 

 month from March to December, inclusive ; often on flowers. 



E. TRANSVERSus Wiedemann. — Common ; taken from April 7 to October 

 26; rests on flowers, often on yellow flowers. Pupa has been found in 

 pocket of tulip tree, Greene. 



• See also p. 203. 



