372 



BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



Remarks. — Compared with the type of pallescens, our specimens 

 from the Rio Grande Valley, at El Paso, are paler — almost ecru drab. 



A specimen of this species (No. -V^^; U.S.N.M.) was collected many 

 years ago at El Paso, Texas, and forwarded by Col. J. D. Graham 

 to Professor Baird, who included it in his "list of specimens" of 

 " Hesperomys sonoriensis he Conte. " 



Habits and local distribution. — Seven were trapped in the vicinity of 

 Monuments 1 and 15. No others were seen. One taken at Monu- 

 ment No. 15 had its stomach packed full of scorpions. 



Record and measurements of 7 specimens of Onychomys pallescens. 



ONYCHOMYS MELANOPHRYS (Mernam). -/"lltAjeC&id^ 

 BLACK-EYED GRASSHOPPER MOUSE. o-^^-l. 'T ( \JLAn./y.^ 



Onychomys leucoffa.sler melanophrys .Mkkki.a.m, -Vortli .\mencaii F'iiiina, No. 2, Oct. 30, 



1889, pp. 2-5 (original description). 

 0[nychomys] melanophrys, Merriam, North American Fauna, No. 3, Sept. 11, 1890, p. 



61.— P:lliot, Field Col. Mus., Zooi. Ser., IV, 1904, pp. 165, 166 (Mam. Mid. 



Am.). 

 Onychomys melanophrys, Miller and Reiin, Proc. Bost. Soc. Nat. Hist., XXX, No. 1, 



Dec 27, 1901, p. 67 (Syst. Results Study N. Am. Mam. to close of 1900). 

 [Onychomys leucoyaster] melanophrys, Elliot, Field Col. Mus., Zool. Ser., II, 1901, 



p. 120 (Synop. Mam. N. Am.). 



(Type, skin and skull, No. \Ulh 



Type-locality. — Kanab, Utah. 

 U. S. National Museum.) 



Geographical range. — High central region, from lltali to the Mex- 

 ican border; Sonoran areas, near streams. 



Description. — Size large; the stoutest and heaviest species of Ony- 

 chomys known, though falling a little below the measurements of 0. 

 longipes, which is more slender. Average measurements of six adults: 

 Length, 163 mm.; tail vertebrae, 52 (to end of pencil, 56); ear above 



