4 PKOCEEDINGS OF THE NATIONAL MUSEUM vol. 71 



and 2 A (concave) are also distinct at the base, but only 2 A can 

 be traced to its extremity. There is a weak convex branch lead- 

 ing from lA, and sending a few branchlets to the posterior margin 

 of the wing. The only cross-veins to be seen are on the basal part 

 of the costal area ; the anal crossing is not preserved. This wing is 

 about the same size as Typus permianus Sellards, but differs in hav- 

 ing the hind margin more arched, and Cu, and lA more distinctly 

 undulated. 



Holotype, Catalogue number 71279, U.S.N.M. 



Locality^ Hermit Shale, about one-quarter mile west of the sign 

 "Ked Top-' on the Hermit Trail in the Grand Canyon National 

 Park, Arizona. 



Horizon^ Lower Permian. 



I have named this species for its collector, Mr. C. W. Gilmore, of 

 the National Museum. 



The taxonomic contribution of Typus gihnorei, new species, is 

 not very great, because it is so poorly preserved, but it does add a 

 new and interesting locality to the three others which have yielded 

 Meganeurids: The Upper Carboniferous of Commentry, France; 

 the Kadstock Coal Measures of Somerset, England; and the Lower 

 Permian limestone of Elmo, Kansas. Geologically, it is of interest 

 also, for it confirms, if any confirmation is needed, the plant evi- 

 dence referring the Hermit Shale to the Lower Permian, since it 

 belongs to an order of insects known only from the uppermost Penn- 

 sylvanian and the Lower Permian, and readily falls into a genus 

 from the latter horizon. 



„ ^ EBFERENCES 



Lull, R. S. 



1918. Amer. Journ. Sci., ser. 4, vol. 45, pp. 337-341, pi. 3. 



Noble, L. F. 



1914. Bull. 549, LT. S. Geol. Surv., p. 69, pis. 5, 6, 11, 18. 



1922. Professional Paper 131-B, U. S. Geol. Surv., pp. 2G, 28-29, 64-66, 



pis. 19, 24. 



SCHUCHERT, C. 



1918. Amer. Journ. Sci., ser. 4, vol. 45, pp. 358-358, figs, 1-3. 



TiLLYARD, R. J. 



1925. Amer. Journ. Sci., ser. 5, vol. 10, ijp. 42-60. 

 EXPLANATION OF PLATE 



Fig. 1. Photograph of holotype of Typus gilnwrei, new species, from the Her- 

 mit Shale of the Grand Canyon. Natural size. Cat. No. 71279, 

 U.S.N.M. 



Fig. 2. A'enation of Typus gilnwrei, new species. C, costa (convex) ; So. 

 subcosta (concave) ; Ri, radius (convex) ; Rs and Us, branches of the 

 radial sector (both concave) ; MA, anterior branch of the media (con- 

 vex) ; Cu2, i)Osterior branch of the cubitus (concave) ; lA, first anal 

 (convex) ; 2A, second anal (concave). 



o 



