218 
Numerous fossil species of this group have been found in Europe, 
but only in Prussian amber, where the variety of forms is so great 
that Loew placed them in no less than four of his proposed new 
genera, and did not recognize among them at all the typical Lim- 
nophilz. These genera were Trichoneura, Critoneura, Tanymera, 
and Tanysphyra, with eleven species; and besides these Osten Sacken 
refers his species of Cylindrotoma, four in number, to this group. 
The species described below, which are the first found in rock 
deposits, may be separated as follows : 
Table of the Species of Limnophila. 
First submarginal cell with a supernumerary cross vein. 
A supplementary cross vein in the costal area, next the base of the przefurca. 
rogerstt. 
No cross vein in costal area. 
Larger species, possessing only four posterior cells ............. vasta, 
smaller species, with five posterior cellaneeesne «sce ae SUYILOSA, 
First submarginal cell with no supernumerary cross vein.......... ruinarum. 
Limnophila rogersii. 
LEAL Ale ise, 
Wings hyaline with fuscous veins and no sign of a stigma. 
Auxiliary vein ending opposite the base of the first submarginal 
cell, the subcostal cross vein at its tip; a supernumerary 
cross vein in the costal area, opposite the base of the pre- 
furca. First longitudinal cross vein ending about midway 
between the tip of the auxiliary vein and the apex of the 
wing. Prefurca arising about the middle of the wing, rather 
strongly arcuate at base, straight beyond, two thirds as long 
as the rest of the vein. Marginal cross vein just beyond the tip of 
the auxiliary vein and opposite the base of the first submarginal 
cell, which has a supernumerary cross vein a little beyond its 
middle. Apparently only four posterior cells, but by the folding 
and overlapping of the wings in the only example known, this 
point is not entirely clear; the same disturbance prevents any 
statement regarding the discal ceil. Legs very slender and long, 
the tibize apically spurred. 
Length of wings, 6.5 mm. ; fore femora, 3.5 mm.; tibiz, 4.5 
mm. ; tarsi, 3.75 mm.; mid femora, 4 mm. ; tibiz, 5 mm.; tarsi, 
5.25 mm.; hind femora, 4.8 mm.; tibia, 5.25 mm. 
