62 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



Virginia, June 16 (N. Banks) ; one female, Falls Church, Virginia, 

 Sept. 10 (N. Banks) ; and one male, North Wilbraham, Massachusetts, 

 Aug. 15, 1916 (D. A. Ricker); all in collection of Nathan Banks. 

 Two males and one female. Chain Bridge, Virginia, Aug. 12, 1923 

 (H. W. Allen); one male and one female, Great Falls, Virginia; in 

 my collection. 



Type and allotype.— Cat. No. 28156 U.S.N. M., Chain Bridge, 

 Virginia, August 12 (male type) (H. W. Allen) ; July 6 (allotype) 

 (J. M. Aldrich). 



The present known range of this species is from Massachusetts, 

 Indiana, and eastern Kansas southward to Virginia and Louisiana. 

 The writer has found the adults common on the high rocky bluffs 

 of the Potomac River, where they may be found on low foliage, in 

 sunlit spots, in open deciduous forest. In the same region they are 

 not commonly encountered in open fields, either on vegetation or 

 denuded ground. However, one specimen from Massachusetts, 

 collected by D. A. Ricker, is labeled "clover." Another specimen 

 examined, collected by Doctor Aldrich is labeled "prey of Laphria 

 canisJ' The host relationships of M. sinipalpis are not known. 



METOPIA PERPENDICULARIS Van der VVulp 



'Metopia per pendicularis Van der Wulp, Biol. Cent. Amer., Dipt. vol. 2, 

 p. 115, 1891. 

 The type, a female specimen from Mexico in the British Musemn, 

 not seen by me. From the description and figures, it is recognized 

 as a species of Metopia distinct from the others described in this paper. 

 It appears to resemble, rather closely, campestris and inermis, from 

 which it is readily distinguished by the perpendicular hind cross vein 

 and the more prominent front. 



Genus SPHENOMETOPA Townsend. 



Sphetiometopa Townsend, Smithsonian Misc. Coll., vol. 51, p. 64, 1908. 

 Genotype, Araba nehulosa Coqiiillett. — Coquillett, Proc. U. S. Nat. 

 Mas., vol. 37, p. 607, 1910. 



Eumetopia Brauer and Bergenstamm, Zweifl. d. Kaiserl. Mus., vol. 56, 

 p. 114, 1889. Preoccupied in Rhyncophora. 



Euaraba Townsend, Proc. Biol. Soc. Washington, vol. 28, p. 20, 1915. Geno- 

 type, Araba tergata Coquillett. 



Arabiopsis Townsend, Can. Ent., vol. 47, p. 285, 1915. Genotype, Arabi- 

 opsis cocklei Townsend. 



Araba of Authors not Robineau-Desvoidy, Coquillett, U. S. Bur. Ent., 

 Tech. Ser., no. 7, p. 127, 1897.— Bezzi and Stein, Kat. Pal. Dipt., vol. 3, 

 p. 508, 1907. — Adams, in Williston's Manual of N. Amer. Dipt., p. 375, 

 1908. 



The genus Araha was proposed by Robineau-Desvoidy in 1830, 

 Myodaires (p. 127), to include several species, no genotype being 

 designated. In 1863, Dipteres des Environs de Paris (vol. 2, p. 88), 



