12 PROCEEDINGS OF THE NATIONAL MUSEUM vol.66 



Green Eiver Eocene, Roan Mountains, Colorado, 1922; Station 11, 

 near top of ridge beyond that on which is Ute trail (John P. Byram) ; 

 also a poorer specimen, found by Mrs. Cockerell. 



Holotype.—C^t. No. 69616, U.S.N.M. 



Scudder's T. gannetti^ based on two specimens collected by Dr. 

 A. S. Packard at Green Eiver, Wyoming, is certainly very similar, 

 but the specimens are not very well preserved. It is not certain that 

 both specimens pertain to the same species, but one of them (Scud- 

 der's pi. 6, fig. 33), may actually be T. packardi. I will therefore 

 take as the type of T. gannetti the other specimen (Scudder's pi. 7, 

 fig. 5). The new species is named after the eminent discoverer of 

 Scudder's T. gannetti. The venation of the hind wings in T. packardi 

 is entirely of the same type as that of T. eocenica (Cockerell), but the 

 latter is readily separable by the marking of the tegmina. 



DIPTERA 

 Family TIPULIDAE 



CYTTAROMYIA OBDURESCENS, new species 



Female. — Length about 9.5 mm.; length of wing 9.5 mm.; its 

 width 2.5. Thorax very small, dark brown; abdomen paler, sub- 

 clavate. Wings pale brown throughout, quite without spots. The 

 following measurements are in microns; length of discal cell about 

 1 800, its width near end about 608 ; length of posterior cells beyond 

 discal about 1360 ; length of marginal cell 3450, the proximal portion 

 considerably longer than distal; cell above discal extending 320 be- 

 yond it; end of second basal 176 beyond basal corner of discal. 

 Praefurca very strongly arched at base, not as long as rest of second 

 longitudinal vein, but very much more than half as long. 



Green River Eocene, Roan Mountains, Colorado, 1922, Station 11 

 (John P. Byram). 



Easily known from C. fenestrata Scudder by the longer discal cell 

 and absence of a dark cloud in end of marginal cell. In Scudder's 

 table it runs nearest to G. cancellata Scudder, from Florissant, but is 

 readily separated by the more produced cell above discal and the 

 second basal extending more below base of discal. 



