PROC. ENT. SOC. WASH., VOL. 22, NO. 2, FEB., 1920 23 



Nusa Walker. 



N. fulvicauda Say. Great Falls, Va., July 10, 12, 1916, J. N. 

 Knull; Cabin John Bridge, Md., July 25, 1913, R. C. Shannon; 

 Washington, D. C., August 22, 1912, F. Knab. 



Lampria Macquart. 



L. bicolor Wiedemann. Great Falls, Va., August 17, 1916, 

 C. T. Greene; August 21, 1917, McAtee; Falls Church, Va., June 

 27, July 16, Banks: Glencarlyn, Va., July 14, F. Knab. 



Laphria Meigen. 

 Key to the Species. 

 A. Disk of thoracic dorsum black except for a central pair of yellow spots; 



general color of pubescence old gold saffrana. 



A A. Coloration otherwise. 



B. With copious bright golden pile over whole dorsum of thorax and 

 abdomen. 



C. Male forceps nearly straight viewed from above, spatulatt, sericea. 

 CC. Male forceps curved, not spatuiate aktis. 



BB. Pile of thoracic dorsum black, at least on sides in front. 



D. Pale pile extending forward at least to middle of pronotum, 



forming a distinct narrow triangle. 



E. Male forceps deeply emarginate at apex, appearing like an 



opposed index finger and thumb; hypopygium oblique, index. 

 EE. Male forceps more shallowly emarginate; hypopygium nearly 



straight ithypyga. 



DD. Pale pile not forming a distinct narrow triangle. 



F. With some dense, crisped, yellowish to golden pile on abdo- 



men canis var. disparella. 



FF. With no more than scattering yellow hairs on abdomen. 

 G. Male forceps, viewed from above, narrowed to apex. 



H. Forceps rather acute, only slightly hollowed out be- 

 neath at apex ; sicula. 



HH. Forceps less acute, slightly upturned exteriorly at 

 ipex; much hollowed out beneath, with a thin ver- 

 tical plate along concave inner margin near apex . . . 



canis. 



GG. Apex of forceps trapeziform winnemana m 



L. sericea Say. Cupid's Bov/er Island, Md., May 31, 1915, 

 R. C. Shannon; Great Falls, Va., May 23, 1918, McAtee; May 

 26, 1914, R. P. Currie; Tune 5, 1917, C. T. Greene; June 16, 1910, 

 R. A Cushman; Scott's Run, Va., June 2, 1912, W. D. Appel; 

 Dead Run, Va., Tune 9. l f )15, feeding on Nicagus obscurus, R. C. 

 Shannon; Falls Church, Va., June 12, 1916, J. N. Knull. 



L. aktis McAtee. Great Falls, Va., May 25, Banks. 



L. index McAtee.- Dead Run, Va., May 27, 1917, McAtee. 



L. ithypyga McAtee. Beltsville, Md., 'June 4, 1916, W. R. 

 Walton. 



