Townsend — New American Muscoid Diptera. 47 



rowed posteriorly in both sexes, nearly or about as wide as one para- 

 frontal. Parafacialia about two-thirds width of clypeus. Facio-orbitals 

 in row of fine hairs only. Cheeks of male about one-third eye-length, 

 those of female two-fifths same. Three postsuturals. Three strong pre- 

 acrostichals, the hind ones long. First vein bristled about half-way, 

 third to small crossvein. None of male tibiae villous. Front and middle 

 metatarsi about half the length of their tibiae. Male claws not very 

 elongate. Median marginals present on second abdominal segment of 

 female, but weak or vestigial in male. Strong median marginals on third 

 segment of both sexes. Male hypopygium large, the first tergite disk-like 

 with posterior exposure. First hypopygial tergite of female entire. 



This form may be recognized at once by its much produced frontal 

 profile, combined with strong preacrostichals. 



Raimondia new genus. 



Genotype, Raimondia uruhuasi n. sp. 



Differs from Sarcophaga as follows: Vibrissa] axis fully three-fourths 

 head-height, a little less than antenna! axis. Clypeus narrow and elon- 

 gate, only a little wider than facialia; carina prominent, epistoma nar- 

 row and but little projected beyond vibrissae. Facialia very wide, con- 

 siderably flattened but showing convexity. Vibrissal angles scarcely 

 constricting facial plate. Proboscis shorter than head-height. Antennae 

 inserted slightly below eye-middle, second joint moderately long, third 

 joint about one and one-half times second. Arista weakly plumose less 

 than two-thirds way. Female vertex not as wide as eye. Frontals di- 

 verging in gradual curve but stopping about even with end of frontalia. 

 One decussate pair of reclinate fronto-orbitals. Frontalia very broad, 

 wider than one parafrontal in middle, gradually narrowed posteriorly. 

 Parafacialia very broad, quite as wide as length of third antennal joint, 

 with median longitudinal patch of hairs in about three irregular rows. 

 Cheeks rather over half eye-length. Three strong postsuturals. Preacros- 

 tichals not represented even by bristles. One strong postacrostichal. Late- 

 ral scutellars two, the hind ones approximated. Squamae longer than 

 broad. Tarsi slightly elongate, female claws long. No median marginals on 

 second abdominal segment, rather strong but slender median marginals 

 on third segment, marginal row of slender ones on anal segment. First 

 hypopygial tergite apparently normal. Male unknown. 



Raimondia uruhuasi n. sp. 



Length of body, 12 mm. ; of wing, 10.5 mm. One female, Uruhuasi 

 Bridge, Canyon of Rio San Gaban, Peru, about 6,500 feet, February 3, 

 1910, on flowers of Baccharis sp. (Townsend). 



Blackish ; head silvery with a faint golden shade, giving way to blackish 

 with change of light incidence on parafrontals except anterior end, in 

 transverse band even with second antennal joint, and in an elongate 

 marking on parafacials next eye. Cheeks and occiput more or less ashy- 

 brown pollinose, thinly black-hairy. Frontalia brown, palpi black. 



