192 
doubtful if the presence or absence of tibial spurs can be of so great 
significance in the Limnobine as seems to be accorded it in the 
classification of Baron Osten Sacken. But, on the other hand, itis 
due to classing this genus among the Cylindrotomini that this tribe 
is made to show such an anomalous preponderance in the American 
tertiaries. 
The species mentioned below may be grouped as in the following 
table : 
Table of the Species of Cyttaromyia. 
Normal discal cell hardly more than twice as long as broad.,........ Jenestrata. 
Normal discal cell nearly or quite three times as long as broad. 
Discal cell shorter, or no longer, than third posterior cell. 
Marginal cell but little longer than breadth of wing... ..préncetoniana. 
Marginal cell nearly one third longer than breadth of wing.. .odigocena. 
Discal cell longer than third posterior cell. 
Proximal portion of marginal cell (measured from the point of origin of 
third longitudinal vein) nearly one third longer than the distal por- 
tion; preefurca almost as long as the remainder of second longi- 
tudinalveins i727 is. cereals os dines cate oe Mae Oar cancellata. 
Proximal portion of marginal cell only one seventh longer than the dis- 
tal portion; praefurca only about half as long as the remainder of 
second. longitudinal veins. (2-/i.. cis eate ee eieeedemat clathrata. 
Cyttaromyia fenestrata. 
Cyttaromyia fenestrata Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., iii, 751= 
752 (1877); Zert. Ins. N. A., 575-576, pl. 5, fig. 78 (1891). 
White River, Utah. 
Cyttaromyia princetoniana. 
Plast ctig est. 
Wings four times as long as broad, the marginal cell but very 
little longer than the breadth of the wing, the proximal much 
longer than the distal portion. Auxiliary vein terminating midway 
between the origin of the third and the tip of the first longitudinal 
vein. Second longitudinal vein arising well beyond the middle of 
the wing, the preefurca about two thirds as long as the rest of the 
vein. Supernumerary discal cell considerably broadening api- 
cally and shorter than the first posterior cell. Discal cell equal, 
slightly less than three times as long as broad, its distal extremity 
lying considerably within that of the supernumerary discal cell, 
