202 [Decembee, 



Inches. 



Dimensions. Total length from tip of nose to root of tail - 5. 



" " of tail vertebra - - - - i 3-lOths. 

 " " from anterior angle of eye to tip of nose 7-lOths. 



' " from tip of nose to auditory opening 1 l^-lOths, 

 ' " of OS calcis including middle toe and 



claw 1 1-lOth. 



*' " from elbow to end of middle hind 



claw - - - - 1 8-10th8. 



" " of middle fore claw - - - 4-10th8. 

 " ' of hind claw - - - - 2i-10thB. 



'* " offuronback - - - - 2|-10ths. 



" " of whiskers, about - - - 1 in. 



Habitat. New Mexico, west of Rio Grande. 



Obs. The specimen in my collection was procured near the San Francisco 

 Mountain, New Mexico, where they were quite abundant. 



These Pouched Rats of the genus Perognathus and Geomys I procured whilst 

 attached as Surgeon and Naturalist to the party under command of Capt. Sit - 

 greaves, U. S. Army, exploring at Zuni, and Little and Great Colorado Rivers 

 of the west. 



Description of a new Snow Finch of the genus Struthus, Boie. 



By S. W. WooDHOUSB, M. D. 



Struthus caniceps. 



Form. Bill longer and more gradually tapering than in S. oregonus. Wings 

 rounded ; first quill shortest ; second, third and fourth nearly equal ; third 

 slightly longest. Tail long and slightly emarginate. Tarsus long and slender. 



Colors. Head above, back of neck, and cheeks dark gray; throat, breast, 

 and sides lighter grey; abdomen, vent, and under tail coverts inclining to white. 

 Upper mandible dark brown, almost black; space between the eye and base of 

 bill black. Back bright reddish brown ; rump and upper tail coverts dark grey. 

 Tail dark brownish black, with the lateral feathers in some specimens entirely 

 white, and with others having large spots of white on their inner webs. In one 

 of the specimens which I have seen, all of the three lateral feathers are mottled. 

 Wings, with the primaries dark brown, and their outer margin narrowly edged 

 with yellowish white. The secondaries with their inner webs dark brown, and 

 their outer light reddish brown; scapular and lesser wing coverts light reddish 

 brown. Tarsi and feet flesh color ; nails brownish. 



Inches. 

 Dimensions. Total length of skin from the tip of bill to end of tail, 6 2-lOthB. 

 " of bill along the ridge > - _ 4|-10ths. 



" of wing from flexure - - - 3 U-lOths. 



" of tarsus 8|-10ths. 



" of tail 3 1-lOth. 



The female has the feet and bill colored like the male ; the general plumage 

 is darker and not so bright. The head is ashy brown, back dark reddish brown ; 

 secondaries dark brown, with a slight reddish brown margin on the outer webs. 

 Scapular feathers and^^lesser wing coverts greyish brown ; the measurements 

 differ but little from those of the male, being slightly smaller. 



Habitat. Western Texas and New Mexico. 



Obs. My attention was first called to this bird by my friend Mr. John Cassin, 

 who very kindly suggested an examination of several specimens of mine in the 

 collection of the Academy in connection with another in his possession, and a 

 female in the collection, made by me when attached to the Exploring party under 

 the command of Capt. Sitgreaves, Topographical Engineer. U. S. Army, in the 



