4 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.64, 



Uolotype.—Q^X. No. 69174, U.S.N.M. 



2. FOSSIL INSECTS AND AN ARACHNID FROM THE EOCENE SHALES 



OF COLORADO. 



DIPTERA. 



Family TRYPETIDAE. 

 EOPHLEBOMYTA, new genus. 



Small robust flies, with rather short abdomen; head rather small, 

 with short but evident bristles on vertex ; antennae ordinary ; the last 

 joint elongate, broadly rounded at end, not flattened on either side; 

 thorax elevated and gibbous anteriorly, dorsally flattened in lateral 

 profile, beset with very small and fine hairs arranged in longitudinal 

 rows, but scutellum with very long stout bristles; abdomen with 

 short hairs, and no niacrochetse ; legs ordinary, tibiae Avithout preapi- 

 cal bristles; minute dark hairs on outer side of tibiae arranged in 

 two fine lines; wings broad, ample, not especially long, perfectly 

 clear, without spots or bands; auxiliary vein bent abruptly upward 

 but not angular, reaching the costa at somewhat less than a right 

 angle, and having at its end a group of three small black bristles, 

 considerably larger than the costal bristles; the auxiliary is distinct 

 throughout, but slender and pale, much weaker than the first vein; 

 first vein reaching the costa about the middle of the wing, little 

 curved, forming an acute angle much as in Neoaspilota^ but not at 

 all bristly ; marginal cell long and narrow, apically very acute ; sub- 

 marginal expanded at end, much as in Polymorpliomyia; first pos- 

 terior with the veins bounding its apical part parallel ; anterior cross- 

 vein more remote from end of discoidal cell than in modern genera, 

 and also shorter, not verj- oblique, the upper side of discal cell 

 drawn upward to meet the cross- vein, and anteriorly to it curved in 

 the fashion more exaggerated in Glossina; anal cell short and closed, 

 not bulging as in Sapromyzidse, and not produced at lower apical 

 corner. 



Genotype. — Eophlebomyia claripennis, new species. 



EOPHLEBOMYIA CLARIPENNIS, new species. 



Plate 2, fig. 7. 



Length 4.5 mm. (abdomen curved downward) ; length of thorax 

 2.2 mm.; wing about 4.5 mm. long and 2.2 broad; dark brown, includ- 

 ing legs, but face pale, and thorax dorsally with longitudinal stripes, 

 much as in Dacus oleae; scutellum not prominent; first abdominal 

 segment with a dark mark above. The specimen appears to be a 

 male. 



