30 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



cates that there was some banding. The ovipositor in P. ornatipes 

 is considerably shorter than in P. tertiarius, so that at first I won- 

 dered whether it was all there; but one of the two impressions is very 

 distinct and I feel sure it is complete. 

 Holotype — Cat. No. 66918, U.S.N.M. 



ODONATA. 



Family LIBELLULIDAE. 



STENOGOMPHUS (?) SCUDDERI, new species. 



Plate 8, figs. 5, 9. 



Female. — Abdomen stout, cylindrical, about 28 mm. long from 

 base of second segment to end of appendages, depth (width in lateral 

 view) about 3.5 mm., uniform to near apex; color as preserved dark 

 brown, second segment with faint sublateral pale marks, segments 

 3 to 7, with sublateral longitudinal colorless bands, ending abruptly 

 on each segment about 1 mm. from the posterior margin, the band on 

 the seventh segment shorter and less distinct; appendages about 2.5 

 mm. long, spear-head shaped (but sides mainly parallel), pointed. 

 The segments measure along the dorsal surface as follows, in mm. : 

 (2) 3.5, (3) 4, (4) 4, (5) 4, (6) 4, (7) 3.8, (8) 2, (9) 1.5, (10) 1. In 

 another specimen (No. 1417), showing only a few segments, the meas- 

 urements are (6) 4, (7) 4, (8) 2.5, (9) 1.5, (10) 1. It is from this 

 specimen that the appendages are measured. There is a large, oblique, 

 thornlike process beneath the eighth and ninth segments. 



Eocene. Type, U. S. G. S. 834 (reverse 752), Green River, Wyom- 

 ing. No. 1417, showing complete appendages, is recorded as from 

 White River, Colorado; but it is in exactly the same kind of rock, 

 and I suspect that it also came from Green River. Another fragment 

 is 787, from Green River. 



This is apparently one of the Corduliinae, closely related to Soma- 

 tochlora, but with a more primitive abdominal color pattern. Scud- 

 der's genus Stenogompihus , based on a wing from Roan Mountain, 

 Colorado, falls in exactly the same vicinity, so there is no apparent 

 reason why the present insect should not be referred to it. 



Holotype and paratype.—Qvkt. Nos. 66919, 66920, U.S.N.M. 



DIPTERA, 

 Family EMPIDIDAE. 



RHAMPHOMYIA (?) ENENA, new species. 



Plate 8, fig. 7. 



Female. — Length, 3 mm.; wings about 3 mm.; thorax about 1 mm. 

 long, elevated, with thin rather long hair (as in the living R. sudigeronis 

 Coquillett, from Palo Alto, California) ; general color dark brown as 



