NORTH AMERICAN DIPTKRA. 281 



with tlie above name. However tliis may be, Mac(|uart'.s gemis 

 {Trichoprosopus Mcq. Dipt. Ex. ii, 3, 70) is a Tachiiiid. 

 The fbUowing two genera are phiced by Br. and v. Bgst. in the 

 Sarcopliagidse, and accredited to North iVmerica : Paramintho 

 "v. d. W." B. B. Muse. Sch. ii, 62, [366,] (1891). Ery- 

 thrandra B. B. Muse. Sch. ii, 64, [368,] (1891). There is 

 nothing in the descriptions to prove their position, and I very 

 much doubt that they belong to this fomily. 



The North American Genera of MV SCID JE sensu stricto. 



1. Proboscis widely i)r()trii(led, rigid, iind ;idai)ted for pierciufr, laheila nearly 



wanting (subfani. Stomoxynse) 2. 



Proboscis but little exserted, fleshy, not adapted for piercing, with fleshy 

 terminal lips or labella (Muscinse) 3. 



2. Palpi thread-like, thin, much shorter than the proboscis, not extending be- 



yond oral margin Stoiiioxys Geof. 



Palpi longer, extending far beyond oral margin, only a little shorter than 



the proboscis Hsematobia R. D. 



o. Arista pectinate, thinly hairy on the upper side, but bare or only pubescent 



below Idia Meig. 



Arista plumose, hairy alike on both sides, or rarely very short pubescent, 



almost bare 4. 



4. Fourth vein arcuate at bend o. 



Fourth vein angular at bend, or if almost arcuate, then the apical cross-vein 



bowed in 11. 



5. Face straight, vertical, epistoma never prominent, arista very short pubes- 



cent; front border of wing somewhat dilated before apex, apical cros.s- 

 vein strongly bowed out; yellowish or testaceous species Orniia R. D. 

 Face not vertical, epistoma always more or less prominent; arista long plu- 

 mose, front border of wing not dilated : not wholly yellowish, usually 

 metallic green, blue or black species 6. 



6. Middle tibiie on inside with one or more erect bristles, or clothed with shaggy 



hair 7. 



Middle tibife without such bristles or hair 9. 



7. First longitudinal vein ending well beyond middle of wing, therefore the 



small cross-vein situated a good distance before its termination ; eyes 



hairy M«'st»iiibriiia Mg. 



First vein ending about middle of wing, the small cross-vein situated oppo- 

 site, or but little before its tennination 8. 



8. Metallic shining gold-green or blue species, without lighter pollen or otlier 



colored pubescence; eyes usually naked F^rcllia R. D. 



Other colored species, more or less light i)ollinose; eyes thickly haii.\-. 



o Ika*».y|>li4»i'» K. D. 



!). Eyes naked <'.vrlon«'iira Mcq. 



Eyes hairy 10. 



TRANS AM. KNT. SOC. XIX. (3(j) DKCKMBEK, 1892. 



