220 
the wing in the only specimen known. Legs slender, not very 
long, the tibize distinctly spurred at apex. 
Length of wings, 6.25 mm. ; hind tibiz, 2.75 mm. 
Florissant, Coiorado. One specimen, No. 8178: 
Limnophila ruinarum. 
Pl. 4, fig. 6. 
Wings very faintly and uniformly infumated, with no stigma. 
The front margin of both wings is imperfect, not permitting the 
auxiliary vein to be fully traced ; but it is probably rather short, as 
the first longitudinal vein ends about opposite the middle of the 
first submarginal cell. The przefurca is very long, arising before the 
end of the basal third of the wing, is gently arcuate at base, straight 
thereafter, and nearly as long as the rest of the vein, which is 
exceptionally arcuate. Marginal cross vein oblique, further from 
the base of the first submarginal cell than it is from the origin of 
the third longitudinal vein; this cell without any supplementary 
cross vein. Four posterior cells. The discal cell pointed at base, 
and though by this made longer, it is not much more than half as 
long as the second posterior cell. The great cross vein strikes the 
middle of the discal cell, and the fifth longitudinal vein is slightly 
bent where met by it. No supplementary cross vein in the second 
basal cell. Legs not very slender and relatively shorter than 
in the other fossil species, the tibiz with apical spurs. Abdomen 
dark above, light below. 
Length of wings, 8.25 mm.; hind femora, 4.25 mm. ; tibie, 
5-5 mm. 
Florissant, Colorado. One specimen, No. 9575. 
PRONOPHLEBIA Scudder. 
Pronophlebia Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., iii, 750 (1877); 
Tert. Ins. N. A., 573-574 (1891). 
This genus was established upon a single imperfect specimen, in 
which the third appeared to rise from the second longitudinal vein 
almost immediately after the separation of the latter from the first 
longitudinal vein, and so was very different from its origin in any 
other group of Limnobinz. Renewed examination of the speci- 
men does not enable me to contradict this interpretation of the fossil, 
