224 
of the wings. Abdomen with a dark dorsal stripe on a pale 
ground. 
Length of wings, 13.5 mm.; hind femora, 8.5 mm. 
Florissant, Colorado. One § specimen, No. 8847. 
TripuLa Linné. 
Tipula Linn., Syst. Mat., ed. i (1735). 
This is a cosmopolitan genus with an enormous number of species, 
found in every quarter of the world, but most numerous in north 
temperate countries. Sixty-seven species have been. credited to 
North America from Greenland to Mexico, and no less than eighty- 
eight to Europe. Fossil remains of this genus have also frequently 
been credited to different deposits in Europe, as at Sieblos, Oenin- 
gen, and Brunstatt in Germany, Aix in France, Gabbro and Chia- 
von in Italy, and the Krottensee in Bohemia, besides numerous 
examples at Radoboj in Austria and in Prussian amber. From the 
former of these last two deposits half a dozen species -are described 
and figured, while in amber Loew has recognized from eleven to 
sixteen species, none of them yet described. In a very few in- 
stances the fossil species referred to Tipula can be shown to belong 
elsewhere, but most of them can be assumed to be true Tipule. In 
America we have already found seventeen species, most of them at 
Florissant, the remainder in the Gosiute fauna at Green River, 
Wyoming. 
The greater number, both of individuals and species, of the 
Florissant Tipulinze belong to the genus Tipula in the strictest 
sense. Ihave been unable to discover any constant and pervading 
differences to distinguish them from existing forms, but have sepa- 
rated on one side and the other certain species which show marked 
individual characteristics, sometimes in unexpected and rather sur- 
prising features; and have besides divided the genus in the follow- 
ing table into two groups by the length of the przefurca, the ex- 
treme brevity of which in certain species closely allied to Tipula 
has induced me to separate them as a distinct genus, Tipulidea. The 
species with relatively short preefurca, which I leave in Tipula, seem 
to agree in this particular with the existing Mexican species, 7. 
edwardsit, figured by Bellardi. 
Two fossil species formerly described by me as Tipulz (under the 
names Zipula decrepita and Tipula’tecta) are certainly not Tipu- 
