22 PROCEEDINGS OF THE NATIONAL, MUSEUM vol. 7» 



Coquillett ^^ believed the two genera to be synonymous as did also 

 Aldrich.^'' Townsend ^' admits that there is a very close relationship 

 between Parafrontina^ Achaetoneura, Maslceropsis, and Tpophae- 

 myia but differentiates the first from the others by its thickly pilose 

 eyes. Obviously there is a mistake here, as an examination of the 

 type material (Texas, Belfrage) shows the eyes to be distinctly 

 naked. The species undoubtedly belongs to the archippivora com- 

 plex even though not identical with the type of archippivora. 

 Ypophaemyia malacosomae hrasiliensls Townsend ^^ from Brazil^ 

 Zygofrontina capitas Townsend ^^ from Peru, and species from South 

 America which are in the United States National Museum collection 

 labelled " near archippivora " are allied and exceedingly close to 

 archippivora but their distribution excludes them from considera- 

 tion in this paper. 



Front at vertex in male 0.35 to 0.38, in female 0.35 to 0.37 the head 

 width; at widest part (base of antennae) in male 0.48 to 0.49, in fe- 

 male 0.48 to 0.50 the head width ; width of bucca about one-sixth the 

 eye height; third antennal joint in male from five to seven and in fe- 

 male four and one-half to five times the second; front projecting 

 beyond eye from one-half to three-fourths eye width; front pulvilli 

 of male less than length of last tarsal joint. Hind cross vein sinuate^ 

 distance from its end to small cross vein nearly twice its length, 

 sometimes considerably less; distance from end of hind cross vein 

 to angle of fourth vein about equal to its length or one-half again 

 as much. Apical cell open. 



Face and front cinereous, the former silvery, the latter often with 

 golden tinge; facial depression shallow or deep, dependent upon 

 drying; parafacials usually broad, at narrowest part wider than 

 width of third antennal joint; palpi light yellow, sparsely bristly. 

 Antennae black, variable in length, usually about four-fifths the 

 face, sometimes only three-fourths and frequently reaching the oral 

 margin; viewed in profile, the outer edge of the third joint is nor- 

 mally straight, sometimes concave, black or reddish at base in male, 

 in female often reddish on basal half and rarely entirely red. 

 Arista thickened on basal one-half to three-fourths. Facial ridges 

 usually bristly three-fourths way to antennae, sometimes only one- 

 half way. Frontal bristles variable, usually eight or nine with the 

 uppermost ones weak, usually two large reclinate bristles of about 

 equal strength continuing along the line (a little outside) of the 

 frontal rows. Inner vertical bristle strong, outer one about one- 

 is Revision of N. A. Tachinidae, p. 105, 1897. 

 "Cat. Dipt, p. 462, 1905. 



"Bull. Amer. Mus. Nat. Hist., art. 6, vol. 37, p. 232, 1917. 

 18 Idem., p. 231, 1917. 

 IB Proc. U. S. National Museum, vol. 49, No. 2115, p. 427, 1915. 



