252 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 57. 



Family EMPIDIDAE. 



PROTOEDALEA, new genus. 



A genus of Ocydromiinae ; with short antennae, the last joint thick 

 and obp3"rif orm ; thorax moderately elevated; abdomen C3dindrical; 

 hind legs not spiny or otherwise modified; wings ample, broad basally, 

 much as in Oedalea; first radial branch ending far beyond middle 

 of wing (as in Phyllodromia delicata Meunier, from Baltic amber), 

 second ending not far beyond it, third ending slightly below tip of 

 wing (a little above in P. delicata), and unbranched; discal cell large, 

 narrowly truncate at end, emitting in all three veins, the fii'st ap- 

 parently incomplete; anal cell not quite so long as second basal, 

 squarely truncate at end, its end making an angle with end of second 

 basal. Differs from Oedalea by the simple legs and longer discal 

 cell, but it is closely related. It is also near to Anthalia, to which it 

 runs best in Melander's table in Williston's North American Diptera 

 but there is no visible proboscis. It is also near Euthjneura, differing 

 in the antennae; Coquillett considered Anilialia and Eutliyneura to 

 be inseparable. In Coquiilett's table it appears to run best to Scio- 

 dromia, but that differs in the proboscis, and has long and narrow wings. 



Type. — Proioedalea hracJiy- 

 stoma.. new species. 



PKOTOEDALEA BRACHYSTOMA, 



new species. 



Plate 35, fig. 5. 



Male. — Length, 4.4 mm. ; dor- 

 sum of thorax convex, but not 

 high; abdomen cyhndrical, 

 about 3.6 mm. long; wings 

 4 mm. long, dusky. Dark fuscous, probably black in life, with venter 

 of abdomen, except apically, pallid. Scanty long hairs on under side 

 of abdomen. No stiff or ' dark bristles on costa. Proboscis not 

 exserted; eyes apparently contiguous; bases of antennae apparently 

 contiguous. The following measurements are in microns: 



Length of hind tibiae, about 1,360; length of hind basitarsi, about 

 580; width of abdomen about 720; diameter of head about 880; 

 length of discal cell 1,650; discal on second posterior 95; discal 

 on third posterior (not allowing for curve) 480; basal comer of third 

 posterior to apical corner of second basal 960; oblique apical side 

 of second basal 175; apical side of anal 208. 



Type. — Green River (Eocene) shales, above rich shale in Camp 

 Gulch, near Roan Creek, Colorado, Sept. 26, 1917 (Winchester 17-8. 

 U.S.G.S.) 



Holotype.— Cat. No. 66574, U.S.N.M. 



Fig. S.— PROTOEDALEA BRACIIYSTOMA. "VViNG AND 



Antenna. 



