THE FOSSIL ORTHOPTERA OF FLORISSANT, COLORADO. 33 
whole, strikingly different from the existing fauna of that region, 
and were like those of warmer regions to the south. The appa- 
rent resemblances in some cases to the Old World fauna may 
possibly be deceptive, but if they are not, they fall in line with 
the indisputable occurrence of such Old World genera as Glossina 
and Halter. 
ACRIDIIDE. 
Tyrbula scuddert, n. sp. 
Hind leg with femur 174 mm. long, 34 wide, superior carine 
strongly marked ; many broad oblique brown bars, broader than the 
intervals between them. Tibia of same leg 182 mm. long, $ mm. 
wide, the hind margin with sixteen large, two medium, and four 
small spines, the uppermost (small) one 32 mm. from base of tibia, 
the first large spine 7 mm. from base; the large spines formed as in 
T. multispinosa, but so closely set that their bases almost touch, and 
the longest spines are nearly 1} mm. long; the longer spine at apex 
of tibia is about 1 mm. long. Tarsus 6 mm. long. 
Tegmen as preserved about 29 mm. long, but if complete it would 
probably be about 32 mm.; width about 5mm. A slight indistinct 
marbling, but no distinct spots or bands. Venation as indicated in 
Tyrbula scudderi, Cockerell. a. Tegmen. bs. Tibial spines. 
the figure; the costal region broadly expanded, with oblique, rarely 
branching veins, much as in Straplewra texana as figured by 
McNeill; the first subcostal branch must be very short, as it is not 
clearly visible, the base of the costal field being suffusedly brown 
without well-preserved veins; the rest of the venation shows a 
general resemblance to that of various Tryxalines, with the following 
peculiarities : radius branching about middle of tegmen, the branches 
continuing close together, joined by numerous cross veins, approach- 
ing in apical field, but diverging again, the lower branch giving off 
below at least three long oblique veins; media branching a little 
beyond the radius, the branches widely divergent, forming an open 
fork, but gradually approaching as they go toward margin ; cubitus 
simple, ultimately joining first anal. In the figure the stems of the 
media and radius are too close together; with a good lens they can 
be seen to be distinctly separate, joined by numerous small cross- 
veins, but the media is only half as far from the radius as it is from 
the cubitus. 
Miocene shales of Florissant, Wilson Ranch (H. F’. Wick- 
ham). I make the leg the type, because it shows parts which 
can be compared with the descriptions of Scudder’s two species 
of Tyrbula. The tegmen was on another piece of shale, but I 
ENTOM.—JANUARY, 1914. D 
