430 



NORTH AMERICAN INDEX FOSSILS. 



or the posterior ones adapted for jumping. The order apparently 

 connects the Orthoptera proper with the Pal/EODtctyoptera. 

 Of the 88 or more described species of this order, 62 are American, 



Fig, 1731. Gyrophlebia longicollis Handl., Mazon Creek, III. Carbonic. i^=^ 

 radius ; Rs, radial sector; M^ media ; Cm, cubitus ; A, anal area. (After Handlirsch.) 



18 are known from the Allegheny, one each from the Kanawha 

 and the Conemaugh, and 42 from the Permic of Kansas. Exam- 

 ples: Spaniodera ambulans Handl. (Fig. 1730), and Gyrophlebia 

 longicollis Handl. (Fig. 1731), both from Mazon Creek, 111., and 



Fig. 1732. Propteticus infcrnus, X h ^°^^ measures of 111. (After Scudder. ) 



both characterized by having the Sc abridged, the R simple, with 

 the Rs branching ofif near the base. In the last mentioned form 

 the M appears also to be simple. Other examples of closely related 



