48 
2. Without any fasciae of gray pollen on the abdomen, which is sub- 
shining- and almost or wholly destitute of pollen : 3. 
With an opaque, interrupted fascia of yellowish pollen on the second, 
third, and fourth segments of the abdomen; scutellum and 
femora yellow, thorax shining black, the portion in front of the 
transverse suture yellowish pollinose and marked with three or 
four black vitteej wings brown, the costal margin more or less 
yellow, the hind margin broadly hyaline; lower calypteres yel- 
lowish; length, 7 to 11 mm. District of Columbia; Texas, and 
Napa County, Oal. (Systema Antliatorum, p. 220; 1805: The- 
rent. Triehopoda histrio Walker, List of Dipterous Insects, 
Part IV, p. 097; 181*.). Triehopoda trifasciata Loew, Dipt. Anier. 
Sept. Indigena, Centuria IV, No. 90; 1803: also Brauer and 
Bergenstamm in lift.) plumipes Fabr. 
3. Lower calypteres wholly yellowish; abdomen bright yellow, the apex 
sometimes black; legs black, bases of femora sometimes yellow, 
hind margin of wings subhyaline 4. 
Lower calypteres brown, the bases white; abdomen yellowish brown, 
the fifth segment yellow, legs black, the bases of the middle 
and hind femora sometimes yellow; wings brown, a white vitta 
along each of the first live veins, hind margin subhyaline; 
length 11 to 17 mm. District of Columbia; Waco, Tex., and 
Tehuantepcc, .Mexico. (AusserenropiiischeZweif. iusekten, Vol. 
II, p. 20S; 18 '!(). Triehopoda radiata Loew, Dipt. Amer. Sept. 
Indigena. Centuria IV, No. 89; 1803: also Brauer and Bergen- 
stamm in lift. I formosa Wied. 
4. Penultimate section of fourth vein of male bordered in front with 
whitish, the first live veins usually partly bordered with white, 
a yellowish spot on front part of each wing of the male; length, 
9 to 14 mm. West Roxbury, Mass. j District of Columbia; Vir- 
ginia; Tifton, Ga.; Biscayne Bay, Florida; Cadet, Mo.; Douglas 
County, Kans., and Texas. (Aussereuropaische Zweif. Insek- 
ten, Vol. 11, p. 270; 1830. Thereto- pennipes Fabricius, Systema 
Antliat.p. 219; 1805: non Musca pmnipes Fabricius; 1794. Tri- 
ehopoda aurantiaca Townsend, Proc. Ent. Soc. Washington, Vol. 
II, p. 140; April 2, 1891.) cilipes Wied. 
Penultimate section of fourth vein not bordered with whitish in 
either sex. any of the veins rarely bordered with whitish; wings 
of male usually but not always marked in front with a yellow 
spot; length, 7 to 12 mm. Grimsby, Canada; Belmont, Mass.; 
Philadelphia, Pa.; District of Columbia; North Carolina; Flor- 
ida; Mississippi; Lexington, Ky.; Missouri; Onaga, Kans.; 
Colorado; Los Angeles County, Oal., and Mexico. (Entomolo- 
gia Systematica, Vol. IV, p. 348; 1794: Musca. Thereva hirtipes 
Fabricius, Systema Antliat., p. 219; 1805. Oeyptera eiliata 
Fabricius, loc, cit., p. 315. Phasia jugatoria Say, Jour. Acad. Nat, 
