136 NORTH AMERICAN ORMOSIA (DIPTERA) 



15. Color yellow flaveola Coquillett 



Color yellowish-brown 16 



16. Wings brown; stigma distinct divexa Doane 



Wings nearly hyaline; stigma faint palpalis sp. n. 



17. Antennae of male shorter than the thorax 18 



Antennae of male approximately as long as or longer than the body 



(Ormosia stricte sic dicta) 29 



18. Seventh vein arcuate; axillary cell at middle as wide as or wider than at 



the end •. 19 



Seventh vein not arcuate, diverging from vein 6 25 



19. Thorax reddish with dark median dorsal line. . .rubella Osten Sacken 

 Thorax not reddish 20 



20. Stigma distinct 21 



Stigma indistinct 23 



21. Two basal joints of antennae yellow lanuginosa Doane 



Antennae entirely fuscous 22 



22. Claws of hypopygium simple; wing-veins heavy, meigenii Osten Sacken 

 Claws of hypopygium complicated; wing-veins not heavy . . cornuta Doane 



23. Thorax light yellow 24 



Thorax brown or yellowish-brown perplexa sp. n. 



24. Antennae and palpi, except basal joints, brown. . . cockerelli Coquillett 

 Antennae wholly yellow parallelus Doane 



25. Basal joints of antennae yellow or, at least, paler than the rest 26 



Antennae entirely fuscous 27 



26. Brown; stigma darker . . . .- manicata Doane 



Yellowish brown; region of stigma not darker modica sp. n. 



27. Mesonotum with a blackish line on each side bilineata sp. n. 



Mesonotum with a median brown stripe 28 



28. Thorax reddish-brown deviata sp. n. 



Thorax yellow above af finis Lundbeck 



29. Antennae longer than the body, conspicuously hairy . . longicornis Doane 

 Antennae not longer than the body 30 



30. Veins 6 and 7 widely diverging to the wing margin .... divergens sp. n. 

 Veins 6 and 7 subparallel 31 



31. Joints of antennal flagellum strongly attenuated apically. 



monticola Osten Sacken 

 Joints of flagellum of equal width throughout taeniocera sp. n. 



Ormosia atriceps sp. n. (PI. X, figs. 1 and 2.) 



Yellowish-brown. Antennae — male — scarcely reaching the transverse suture 

 of the thorax. Wings grayish, costa yellowish with three fuscous spots, cen- 

 tral cross vein and beginning of the two branches of vein two, margined with 

 fuscous. Discal cell closed. Veins six and seven diverging to the wing margin. 



J 1 , Length, 5 mm.; wing, 7 mm. 



Head blackish. Eyes very narrowly separated below. Palpi stout, fuscous. 

 Antennae not long, scarcely reaching the transverse thoracic suture; yellowish, 

 thinly beset with rather long hair; basal joint stout, the second moderately 



