420 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. u8. 



4. Size small, wing under 3.5 mm.; basal deflection of Ciu near the fork of M; 



base of the femora yellow, passing into l)lack_M. nova-caesariensis (p. 420). 



Size larger, wing over 4 mm. ; basal deflection of Cm beyond the fork of 



M on Ms; base of the femora not coiuspicuously brightened 5. 



5. Antennae dark colored ; body coloration grayish brown 



M. hirtipennis (p. 420). 



Antennae with the basal segments pale; body coloration; pale brown. 



(Regional) M. forcipula (Osten Sacken). 



The immature stages are spent in moist earth. 



•MOLOPHILUS HIRTIPENNIS Osten Sacken. 



Virginia near Plummers Island, Maryland, June 2, 1916, McAtee ; 

 Dead Kun, Virginia, June 6, 1914; Maryland near Plummers Island, 

 October 10, 1914, at light, R. C. Shannon; Lakeland, Maryland, 

 September 25, 1909, F. Knab. 



MOLOPHILUS NOVA-CAESARIENSIS Alexander. 



Beltsville, Maryland, May 28, 1916; Dyke, Virginia, May 28, 

 1915, McAtee; Falls Church, Virginia, June 30, Nathan Banks. 

 These specimens are more highly colored than the somewhat faded 

 type specimen from New Jersey; the legs are jet black with the 

 coxae, trochanters and femoral bases yellow. 



•MOLOPHILUS PUBIPENNIS Osten Sacken. 



Common; extreme dates of collection, May 29 and September 6: 

 is attracted to light. P. I. 



•MOLOPHILUS URSINUS Osten Sacken. 



Plate 23, fig. 7. 

 Described from specimens collected at Washington, in spring. 



Genus HELOBIA St. Fargeau and Serville. 



HELOBIA HYBRIDA Meigen. 



Common; extreme dates of capture, February 28 and October 22; 

 has been collected on flowers of Antheinis cotula; the imm.ature 

 stages are spent in damp earth. P. I. 



Genus GONOMYIA Meigen. 



KEY TO SPECIES. 



1. Two branches of the sector reaching the wing margin (subgenus Leiponeura 

 Skuse) 2. 



Three branches of the sector reaching the wing margin (subgenus Oonomyia 

 Meigen) 3. 



