201 
Dicranomyia rostrata. 
Dicranomyia rostrata Scudd., Bull, U. S. Geol. Geogr. Surv. Terr., iii, 749 
(1877); Zert. Ins. N. A., 571-572, pl. 5, figs. 40, 41, 63, 64 (1891). 
Tipula decrepita Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., iii, 752 (1877) ; 
Tert. Ins. N. A., 576-577, pl. 5, figs. 56, 57 (1891). 
-Renewed examination of the material formerly studied shows 
these two supposed distinct species to be in all probability identical. 
Lower White River, at the boundary between Utah and 
Colorado. 
SPILADOMYIA Scudder. 
Spiladomyza Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., iii, 749 (1877). 
In this genus the discal cell is open and continuous with the sec- 
ond posterior cell, while the first posterior cell is scarcely longer 
than the submarginal. In other respects it is closely allied to 
Dicranomyia. In a second species belonging to the U. S. Geo- 
logical Survey (No. 1069) the auxiliary vein continues to thestigma 
and as it otherwise agrees tolerably well with the described species 
where the auxiliary vein is very obscure, the generic characteriza- 
tion given should probably be modified to that extent. In both 
species, the second longitudinal vein appears to rise towards the 
first at their apical junction, giving the terminal portion the ap- 
pearance of being a continuation of the first rather than of the 
second longitudinal vein. I leave the description of the new species 
to another occasion. 
Spiladomyia simplex. 
Spiladomyia simplex Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., iii, 750 
C1597) 3. fers Ins. VOA., 573; pl &§, figs. 37, 39 (1891). 
Lower White River, next the boundary between Colorado and 
Utah. 
LIMNOCEMA (Atpyy, xetwar) gen. nov. 
This name is proposed for a group of species which seem to be 
more nearly allied to Limnobia and Trochobola than to any other 
living genus, but which are peculiar for the presence of a marginal 
cross vein near the extreme apex of the wing, well beyond the 
position of the stigma, which is here marked only by a faint cloud ; 
and for the great length of the posterior cells, as in Dicranoptycha, 
PROC. AMER. PHILOS. SOC. XXXII. 143. 2. PRINTED JAN. 10, 1894. 
