Banks, Greene, McAtee, and Shannon — Dist. of Col. Diptera. Ill 



13, 1916, F. R. Cole. Alao flies low. All Microdon larvae so far as 

 known occur in ant nests. 



M. sciTULUs Williston. — Beltsville, Md., July 6, Banks, F. R. Cole, 

 Greene; July 9, McAtee; July 14, abundant, pairing, F. R. Cole, Shannon, 

 H. L. Viereck; July 30, in copula; August 6, McAtee; all dates 1916. 

 This species found among vegetation bordering open spots in sphagnum 

 bogs. The whole series diflFers in the color of the metallic reflections 

 from the purplish blue Florida specimens ; in our form the males have 

 chiefly fiery coppery reflections and the females greenish. It deserves a 

 varietal if not a subspecific name. 



Mixogaster Macquart. 



M. BREVivENTRis Kahl. — Glencarlyn, Va., July 2 and 11, Banks; July 

 25, 1906, D. H. demons; Falls Church, Va., July 25, Banks. Rests on 

 herbage in partial shade. Both localities where Mixogaster was collected 

 contain Bittacus and Panorpa virginica ; the two records for Glencarlyn 

 are seven years apart. 



Callicera Meigen. 



C. JOHNSONi Hunter. — Falls Church, Va. , April 22, 1914, Greene; flies 

 very close to ground. 



Chrysotoxum Meigen. 



C. PUBESCENS Loew. — Not common but has been taken in numerous 

 localities from April 24 to September 26, rarely however in June, July or 

 August. Always found in bright sunlight, frequently resting on low 

 foliage or near the base of trees. Chrysotoxum ventricosum hoew (Cen- 

 turia quinta, p. 44), in connection with the original description, was 

 recorded from Washington. This was misinterpreted by Osten Sacken 

 and Williston to mean Washington City, while in reality Washington 

 State was intended as shown by the locality labels " W. T." on the type 

 specimens. (See Johnson, 1907, p. 77.) 



Chrysogaster Meigen. 



C. GREENEi Shannon.* — Great Falls, Va., on flowers of Amelanchier 

 and of Salix sericea, April 20, 1916, McAtee; Falls Church, Va., April 

 27, 1915, Greene; Mount Vernon, Va., on flowers of Amelanchier, May 

 7, 1916, L. O. Jackson. 



C. NiGRiPES Loew. — Fairly common May 9 to July 6; is attracted to 

 light, visits flowers of Amelanchier, Salix, Ceanothus, and once occurred 

 in great abundance on chinquapin flowers at Falls Church, Va. 



C. NiTiDA Wiedemann. — More common than last; April 23 to October 

 31; in copula, July 14; on various flowers, as Ceanothus and wild carrot. 

 * For description of this species see appendix, p. 195. 



