21 
Rhamphidia thybotica n. sp. 
At a first glance it may seem rather strange that I have referred 
the Tipulid-wing, fig. 10, procured from cement-stone, to the genus 
Rhamphidia. In this genus Subcosta ends in the anterior margin 
of the wing, and in the present form it is seen to end in Radius, 
a character which is stated as typical to the family Tipulidœ, 
whilst the family Limnobiidœ , to which Rhamphidia belongs, has 
Subcosta ending in Costa and at the same time near apex sends 
a small cross-vein down to Radius. This character is, however, not 
more stable than that Subcosta in the recent North-European R. lonyi- 
rostris bifurcates quite apically sending one branch in a right angle 
on to Costa and the other, the stronger one, down to Radius. In 
some species, such as the American R. ftavipes Macq. and mainensis 
Alex, (figured by Alexander in Proc. Acad. Nat. Sei. Philadelphia 1916 
pi. XXV. fig. 13—14 — I regret that I do not know them from autopsy) 
5c 
fiw 
Ai 
Fig. 10. Rhamphidia thybotica n. sp. 
the fork branch on to Costa is missing, so that these species present 
the Tipulid character: Subcosta only ending in Radius. The venation 
of the Eocene wing otherwise agrees the best with the Rhamphidia- 
genus (of which also some few species are known from Tertiary de¬ 
posits, from amber and from Florissant). The above described pe¬ 
culiarity of Subcosta thus not preventing its reference to this genus 
it must be reckoned justifiable to refer it to Rhamphidia , as its 
venation otherwise quite agrees with that of this genus. 
As characteristics of the present wing it further is to be stated 
that Subcosta is slightly proconvex in its distal part, just before its 
ending in Radius. The distal part of Ri is not recognizable in this 
on the whole rather indistinct impression, wherefore its distal course 
cannot be stated. The stem of the other R-branches issues from the 
Radius-stem some way basad to the place where Subcosta issues 
from the latter. M 3 issues from Mi -2 and not from the cross-vein 
bounding the discoidal cell distally. C 112 is slightly and evenly curved, 
on account of which the cross-vein connecting it with Cu 1 is well 
developed. Length 14 mm. As for the rest, the wing much resembles 
