94 



Middle tibia- each bearinj;' a single inacrocha'ta ou the front side 

 near tlic middle; snitellum black; apical cell open; front in the 

 female tliiee-fouitlis as broad as either eye ; fa(;e, white polliiiose; 

 third Joint of antenna' three times as long as the second; length, 

 njni. Franconia, N. U.; Georgia; Missonri, and Texas. (Biol. 

 Cent. Anier., Dipt., Vol. IT, j). G4; Feb., 1890.) . . ordinaria v. d. W. 

 9. Sciitelhini largely yellow, front bearing numerous short, nearly 

 erect hairs, third vein bearing two bristles near the base, ai^ical 

 cell open, I'ront in the male two-thirds, in the female live-sixths, 

 as wide as either eye, third joint of antenmc in the male two 

 and one-fourth, in the female one and three-fourths, times as 

 long as the second; length, G to 8 mm. Toronto, Canada; Fran- 

 conia, N. H.; Summit County, Colo.; Germany, and Austria. 

 Two females from Germany received from Zeller and by him 

 named Exorlstd alfinis; also one female from Austria from the 

 old Schiner collection, received from Brauer and Bergenstamm 

 and by them named Farexorista polycha'ta Macq." (Kongl. 

 Svenska Vetensk. Akad. Ilandlinger, Vol. XXXI; ISIO: Tach- 

 ina. Exoruta polych(eta Macquart, Annales Soc. Entomol. 

 France, j). 380; 1849. Tachiua epicydes Walker, List of Dip- 

 terous Insects, Part IV, p. 786; 1849. Farexorista sp., Brauer 

 and Bergenstamm in lift.) ajfinis Fallen. 



Scutellum black, hairs of front short and inconspicuous, front in the 

 female live-sixths as wide as either eye, the third antennal joint 

 two and one-half times as long as the second 10. 



Scutellum black except the tip, third joint of antennjie five times as 

 L >ng as the second ; black, the palpi and extreme tip of scutellum 

 yellow; front of female as wide as either eye, hairs on its sides 

 sparse but rather long, frontal bristles descending almost to 

 base of third antennal joint, sides of face white pollinose, cheeks 

 one-seventh as wide as the eye-height, anteume almost as long as 

 the face, arista thickened on the basal third, the i)enultimate joint 

 shorter than broad; thorax gray pollinose and marked with four 

 black vitta'; scutellum bearing four marginal pairs of macro- 

 chu'tu^, the last pair cruciate and directed backward; abdomen 

 subshining, the last three segments gray pollinose except on 

 their apices, the bristly hairs rather long and subdepressed; 

 wings hyaline, third vein bearing two bristles near the base, 

 the fourth strongly arcuate beyond thebeiul, calypteres whitish; 

 length, 8 mm. University, Xorth Dakota. A single female speci- 

 men collected in June, 189(5, by Mr. K. P. Currie. . .curriei u. sp. 



' In the Zweif. Kais. Mus. Wien, V, p. 320, these authors give affinis as a probable 

 variety oi pohjchata, but the two names are evidently referable to one and the same 

 species. Schiner's statement in liis Fauna Austriaca, Vol. I, p. 463, that in affinis the 

 frontal bristles are in a single row, while in poliichifta they are iu two rows, or irreg- 

 ularly arranged, does not hold true in all the specimens; in one of those from 

 Germany, referred to aT)ove, they are in a single row ou cue side of the frout, but are 

 irregularly arranged ou the opposite side. 



