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 eases 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. 



ACRIDIID^. 



Tyrbula scudderi, n. sp. 



Hind leg with femur llh mm. long, 3^ wide, superior carinaB 

 strongly marked ; many broad oblique brown bars, broader than the 

 intervals between them. Tibia of same leg 18f mm. long, \ mm. 

 wide, the hind margin with sixteen large, two medium, and four 

 small spines, the uppermost (small) one Sf mm. from base of tibia, 

 the first large spine 7 mm. from base ; the large spines formed as in 

 T. muUispinosa, 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 5 mm. A shght indistinct 

 marbling, but no distinct spots or bands. Venation as indicated in 



Tyrlula scudderi, Cockerell. a. Tegmen. b. Tibial spines. 



the figure ; the costal region broadly expanded, with oblique, rarely 

 branching veins, much as in Stirapleura 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 Eanch [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. U 



