174 U. S. NATIONAL MUSEUM BULLETIN 209 



rather dense, but still sparse enough so that these parts are somewhat 

 shining. The punctures on the frons are not quite contiguous, with 

 their intervening ridges about 0.35 as wide as the diameter of the 

 punctures. 



Blackish. Face with a longitudinal whitish or cream-colored mark 

 next to the eye, this mark sometimes obsolescent; wings tinged with 

 brown, the apex of the forewing somewhat infuscate; wing veins dark 

 brown; spurs of fore and middle tibiae stramineous; seventh tergite 

 with a large white spot; pubescence of head and thorax silver gray. 



Female: Forewing 7.5 to 9.0 mm. long; pubescence and setiferous 

 punctures of mesoscutum and of upper part of head and pronotum 

 sparse, so that these parts are quite shining; pubescence of clypeus, 

 face, and lower lateral part of frons very long and dense; third cubital 

 cell receiving the second recurrent vein at its basal 0.45. 



Black. Wings tinged with yellowish brown, the apex of the fore- 

 wing somewhat infuscate; wing veins yellowish brown; pubescence 

 of head and thorax yellowish white, the long pubescence of the clypeus, 

 face, and lower lateral part of the frons quite yellow. 



Specimens: cf , Lyme, Conn., July 12, 1918, W. S. Fisher (Washing- 

 ton). 9, Chicago, 111. (Cambridge). cT, Wills County, 111., Aug. 

 24, 1942, R. R. Dreisbach (Cambridge). 29, Sioux City, Iowa, 1922 

 and no date, C. N. Ainslie (Washington). 9, Iowa, Aug. 7, 1937, 

 H. E. Jaques (Ithaca), cf, Lawrence, Kans., June 10, 1900 (Evans). 

 2cr, Opelousas, La., May and June 15, 1897, G. R. Pilate (Washing- 

 ton), cf , Tallulah, La., June 25, 1948, R. C. Gaines (Washington). 

 9, Detroit, Mich., July 17, 1937 (Shappirio). 9, Raleigh, N. C, 

 Aug. 3, 1934, C. S. Brimley (Raleigh), cf , Columbus, Ohio, July 15, 

 1930, J. S. Hine (Cambridge). 9, Logan County, Ohio, July 12, 

 1930, J. Patton (St. Paul). 9, Linglestown, Pa., Aug. 2, 1911, W. S. 

 Fisher (Washington). 9, Tiverton, R. I. (Cambridge). cT, Camp 

 Crook, S. Dak., Aug. 1, 1924 (Cambridge). 29, Dunn Loring (near 

 Vienna), Va., July 27, 1947, and Aug. 6, 1949, K. V. Krombein 

 (Krombein). 5cr, 59, at honeydew. Falls Church, Va., July 5, 11, 

 and 25, Aug. 22, and Sept. 6, N. Banks (Cambridge). 9, East Troy, 

 Wis., Aug. 10, 1935, Paul B. Lawson (Lawrence). 



This species is on the wing mostly in July and August. It occurs 

 in the Carolinian and Austroriparian faunal areas. 



Subgenus Nemagenia Banks 



Nemagenia Banks, 1944, Bull. Mus. Comp. Zool., vol. 94, p. 179. Type: Pompilus 

 (Agenia) longulus Cresson; original designation. 



Clypeus rather short, its apical hairless margin rather narrow, 

 polished, and not set off by a groove; lower edge of mandible in its 

 basal third somewhat rounded and without a distinct ridge (with a 

 more or less distinct ridge in all the other subgenera except Leucojphrus) ; 



