ART. 9 TWO-VriNGED FLIES OF TRIBE MII.TOrjRAMMIXI ALLEN 45 



distinguish the genus from all other known North American Milto- 

 gramminae. Other outstanding characters are as follows ; the presence 

 of a single frontal row, the macrochaetae of which descend helow the 

 base of the antennae; vibrissae inserted near oral margin; antennae 

 extending nearly to vibrissae; parafacials with a row of macrochaetae 

 near the facial ridges which increase in size, downward. Thorax witli 

 two sternopleural bristles. Wings with first apical cell open and 

 ending far before extreme wing tip; fourth vein with the usual strong 

 fold at the bend. Middle tibia on outer front side near middle with 

 a single macrochaeta. 



OPSIDIOPSIS OBLATA Townsend 



Opsidiopsis oblata Townsend, Proc. U. S. Nat. Mus., vol. 56, p. 544, 1919. 

 Chaefoplagia modesta Reinhard, Ann. Ent. Soc. Amer., vol. 14, p. 234, figs. 9, 

 10, 1921. 



The synonomy given above was pointed out to me by Dr. J. M. 

 Aldrich who had previously compared the types. In this species the 

 tliird antenna! joint and the palpi are black; the frontal vitta at its 

 middle is fully three times as wide as either parafrontal; the thorax is 

 marked with four black vittae; tha-ee postsutural dorsocentral bristles 

 are present; the scutellum bears three pairs of long marginals; the last 

 tlii'ee abdominal segments are white pollinose on the broad bases, 

 witli polished black apices; the first abdominal segment is without 

 median marginal bristles, the second and the third each bears a mar- 

 ginal pair, and tlie fourth a marginal row; the costal spine of the wing 

 is minute. 



Type.— Female, Cat. No. 22090, U.S.N.M. 



Host relationships. — Unknown. 



Range. — Utah, New Mexico, Texas. 



The following material has been examined. The type, a female 

 from Wild Horse Canyon, Animas Mountains, New Mexico, 5,000 

 feet (C. H. T. Townsend), in the National Museum; one female from 

 College Station, Texas, type for {CJiaetoplaf/ia modesta Reinhard 

 (H. J. Reinhard) ; and one other specimen from North Bear Run, 

 Utah (A. Wetmore). Townsend reports collecting the adult on 

 tender mesquite foliage. 



Genus METOPIA Meigen 



Metopia Meigen, Illig. Mag., vol. 2, p. 280, 1803. Genotype, Musca leuco- 

 cephala Rossi from Europe. — Schiner, Fauna Austr., vol. 1, p. 488, 1862. — 

 Brauer and Bergenstamm, Zweifl. d. Kaiserl. Mus., vol. 56, p. 114, 1889; 

 vol. 60, p. 168, 1893.— Van der Wulp, Biol. Cent.-Amer., Dipt., vol. 2, 

 p. 114, 1890.— Coquillett, U. S. Bur. Ent., Tech., Ser., No. 7, p. 127, 

 1897; Proc. U. S. Nat. Mus., vol. 37, p. 569, 1910.— Adams, in Williston's 

 Manual of N. A. Dipt., p. 376, fig. 151, no. 88, 1908.— Townsend, Smith- 

 son. Misc. Coll., vol. 51, p. 56, 1908; An. Ent. Soc. Amer., vol. 4, pp. 130, 

 140, 1911. 



