1938 ] 
Fossil Insects 
113 
greatest width. Venation: Rs relatively long, about one 
half longer than m-cu, or subequal to the width of cells R 
and M opposite its origin; vein Rl-\-2 preserved; petiole of 
cell Ml variable in length, from one third as long to subequal 
to m; m-cu at fork of M3 + U; cell 2nd A of moderate width. 
Hypopygium moderately enlarged, the outer end trun- 
cated. Ovipositor with relatively stout valves. 
Holotype: No. 4536, Museum of Comparative Zoology, 
collected by Allan Caplan ; this consists of a nearly complete 
insect. 
Paratypes (both sexes) : twenty-three in the Museum of 
Comparative Zoology (Nos. 4473-4495), and one in the 
University of Michigan Museum (No. 15383). The speci- 
mens figured are the holotype and paratype no. 4489. 
I take unusual pleasure in naming this interesting Miocene 
Tipula in honor of Dr. F. M. Carpenter. As shown by the 
figures, there is a somewhat marked variation in the wing- 
pattern and venation in different individuals. The possi- 
bility exists that more than a single species is included in 
the present series but this does not seem to be the case. In 
some specimens the radial cells beyond the post-stigmatic 
white fascia are more uniformly darkened than in others, 
as shown by the figures, which represent extremes within 
the series. In No. 4489, figured, cell MU is more strongly 
narrowed at wing-margin than in the holotype, while vein 
R3 is slightly less extended. This individual, while repre- 
sented chiefly by the wings, is evidently a female and is the 
largest specimen whose measurements are given above. 
The species that is most similar to the present fly would 
appear to be Tipula limi Scudder, which is somewhat smaller, 
with narrower wings. Scudder describes the species as 
having a darkened cloud at origin of Rs but in neither of his 
figures (l.c., PL 8, fig. 4, $ ; PI. 9, fig. 1, $ ) is this distinctly 
shown. This Florissant species has distinct lateral stripes 
on the abdominal tergites in addition to the subequal median 
vitta. 
The various allied Miocene species having patterned wings 
may be separated by the accompanying key : 
1. Wings with vein Sc relatively short, Sc2 ending at near 
midlength of cell R1 and about opposite two thirds the 
length of Rs. 2 
