58 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



front side near middle; hind tibia on outside with row of about five 

 uneven bristles extending from base to apex. 



Female. — ^Front at narrowest 0.346 of head width (measurements 

 of three 0.33, 0.35, and 0.36) ; fore tarsus lacking the long erect hairs 

 on the outside. Otherwise, except for usual differences of genitalia, 

 like the male. 



Length, 4 to 5 mm. 



TyiJe, Allotype, and Paraty pes. —Cat. No. 28155, U.S.N. M. 



Range. — Louisiana, Texas, New Mexico, Cuba. 



Host relationships. — Unknown. 



Described from two males (one type) and four females (one allo- 

 ty])e) Havana, Cuba (Baker) ; one male, vShreveport, Louisiana, 

 July 3, 1890 (F. W. Mally) ; one male, Kennedy, Texas, May 4, 1896 

 (Marlatt); and one male, Las Vegas, New Mexico, Aug. 17 (Barber 

 and Schwarz) ; all in the National Museum. 



The female of this species and of M. lateralis are sometimes diffi- 

 cult to separate since the presence of red or yellow on the sides of the 

 abdomen and the color of the palpi seems to be a rather variable 

 character. Males, however, are readily separated on the ornamenta- 

 tion of the fore tarsus. 



METOPIA LATERALIS (Macquart) 



Degeeria lateralis Macquart, Dipt. Exot. Suppl., vol. 3, p. 208, pi. 5, fig. 6, 



1847. From North America. 

 Metopia lateralis Coquillett, U. S. Bur. Ent., Tech. Ser., No. 7, p. 127, 



1897. As synonym of lencocephala. — Aldrich, Cat. N. A. Dipt., p. 476, 



1905. Questions whether equals leucocephala. — Bezzi and Stein, Kat. 



Pal. Dipt., vol. 3, p. 512, 1907. Synonym of leucocephala. 

 Parametopia morrisoni Townsend, Proc. U. S. Nat. Mus., vol. 49, p. 619, 



1914. 



Male. — Front at narrowest 0.34 of head width (measurements of 

 five 0.32, 0.32, 0.33, 0.35, 0.36) ; frontal vitta black, broadening slightly 

 toward the rear, at middle more than twice as wide as either para- 

 frontal; parafrontals gray to golden pollinose; frontal row with nine 

 to eleven bristles extending to slightly below base of second antennal 

 joint; numerous small black bristly hairs on front, more plentiful 

 near base of antennae; vibrissae near oral margin; antennae black, 

 extending to length of second antennal joint above front edge of oral 

 margin; third joint four to five times as long as second; arista thick- 

 ened on basal two-fifths, with short pubescence in middle; j^alpi 

 smaller than thickened part of arista, filiform and usually black; in 

 profile, front projects forward about one-fourth horizontal diameter 

 of eye, bucca equals one-fifteenth of eye height; parafacials gray 

 pollinose, bare save for the usual row of strong macrochaetae near 

 the facial ridges which extend downward more than half way to vibris- 

 sae, but usually not reaching the level of the uppermost bristles of the 



