1928] A New Protodonatan from the Grand Canyon 189 
Typus whitei, n. sp. 
Described from a nearly complete fore wing, with the fol- 
lowing characteristics: wing rather broad, with a pointed apex, 
and reduced anal area; hind margin greatly curved. Length of 
wing, 9.3 cm.; estimated width, at middle of wing, 2.2 cm. 
Rs arising close to the base of the wing, not far from the origin 
of Rl; R2 and R3 diverging well beyond the middle of the wing; 
M+R straight at base, but diverging downwards after the origin 
of Rl; Cu2 and 1A deeply undulated, the curves of these veins 
corresponding; 2 A straight; Cu2 reaching the hind margin of 
Canyon. 
Sc, subcosta (concave); R, radius (convex); Rs, radial sector (concave); Ma, anterior 
media (convex); Cu2, Posterior cubatus (concave); 1A, first anal (convex); 2A, second anal 
(concave) . 
the wing at a point about two-thirds the wing-length from the 
base. The costal margin has been entirely macerated away, 
only the apical parts of Sc and Rl remaining. There are a few 
cross-veins visible between the bases of M+R, Cu2, and 1A. 
Holotype: catalogue number 71713, United States National 
Museum; collected by Dr. David White on the Bright Angel 
Trail, Grand Canyon National Park, Arizona, under the aus- 
pices of the Carnegie Institution. 
Horizon: Lower Permian. 
At first glance this wing might be taken for the hindwing of 
T. gilmorei Carp., since it is slightly shorter and broader than 
the latter. But the reduced anal area is not at all characteristic 
of a hindwing of the Protodonata, as far as the order is known to 
us, and the differences in venation can hardly be explained in 
this manner. The most obvious of these differences is that the 
