138 



and lower side of the third iit its base, tbe palpi, npex of seutel- 

 lum and of the abdomen, yellow : front in female one and cue-fifth 

 times as wide as either eye, two pairs of orbital bristles, sides 

 of face bristly on the upper two-thirds in addition to the row of 

 macrochiieta', cheeks sligiitly wider than the eye height, antenna? 

 four-fifths as long as the face, the third joint four times as long as 

 the second; aristathickenedonthebasal three fifths, the penulti- 

 mate joint four times as long as wide, nearly twice as long as the 

 first joint; thorax gray pollinose, marked with four black vittte; 

 scutellum bearing three pairs of long marginal niacrocha^tse; 

 abdomen destitute of dorsal macrocha't;e on the first two seg- 

 ments, tlie third with a marginal row, the fourth covered except 

 on the basal half; middle tibia' each bearing three long macro- 

 cha'tic on the outside near its middle, front tarsi slightly dilated; 

 wings liyaliue, apical cell nearly as wide as the discal cell, third 

 vein bristly nearly halfway to the small crossvein, the others 

 bare, bend of fourth veiu not appendiculate, calypteres white; 

 length, 11 mm. Beverly, Mass. Two female specimens. Type 

 No. 3643, U. S. jSTational Museum orienialis n. sp. 



Genus MICROPHTHALMA Macq. 



Microphlhnlma Macquart, Dipti-res Exotiqnes, Vol. II, P.art III, v. 241 (84); 1843. 



Our species is black, the antennae, face, cheeks, palpi and apex of 

 proboscis, yellow; three postsutural and three sternoi)leural macro- 

 ch?et;e; length, 12 to 15 mm. Franconia, N. H.; Beverly, Mass.; Dis- 

 trict of Columbia; Ch^"'^'^" '^ll.; Georgia; Utica. Miss. ; Texas; Onaga, 

 Kans., and Kern County, Cal. (Analecta Eutomologica, p. 15; 1824: 

 Tackina. MUtogrumma trifasciata Say, Jour. Acad. Nat. Sciences 

 Phila.j Vol. VI, p. 174; 1829. Microphthalma nigra Macquart, Dipteres 

 Exotiques, Vol. II,' Part III, p. 242 (85); 1843. Tackina trixoides 

 Walker, List of Dipt. Insects, Part IV, p. 700; 1849. Megaprosopus 

 mit'higanensis Townsend, Trans. Amer. Eut. Soc, Vol. XIX, p. Ill; 

 May, 1892. Macronychia trifasciata, Say, Brauer and Bergenstamm in 

 litt. Dexiosonia sp., Brauer and Bergenstamm m Utt.). .disjuncta Wied. 



Genus AMOBIA Desv. 



Amohia Desvoidy, Essai sur los Myodaires, p. 96; 1830. 

 JUacruHj/chia Roudani, Diptorologia' ItaliciU Prodronnis, p. 229; 1859. 

 Trixoclista Townsend, Trans. Amer. Eut. Soc, Vol. XIX, p. 102; 1892. 

 Ammohia Brauer and Bergenstamm, Zweifliigler Kais. Mus. Wien, VI, p. 226; 1893. 

 {Nov Billberg, Enumeratio Insectornm, p. 105; 1820.) 



The synonymy of Amobia and Macronychia has already been given 

 by S(;hiuer/ and repeated by Brauer and Bergenstamm.^ Two species 

 occur in our fauna; both have only three postsutural macrocha?t;ie: 



Thorax marked with three or five black vitta^; abdomen gray polli- 

 nose, marked with three rows of black spots; orbital bristles 



' Fauna Austrica, Vol. I, p. .501; 1862. 

 2 Zweif. Kais. Mus. Wien, VI, p. 226; 1893. 



