And Synaptomys Stonei. 103 



Mr. Khoads says: '* 



"Special characters, outward appearance and proportions as 

 in S. Cooperii. Above blackish-brown, with black hairs more 

 predominant over the shorter brown hairs than in Cooperii. 

 The same color reaching around sides of belly instead of being 

 confined to dorsal area as in Cooperii. Hoary, gray belly and 

 neck of Cooperii replaced by dark plumbeous gray. Feet, in 

 eluding soles, plumbeous, without brown shade., Two middle 

 toes of forefeet, and four inner toes of hind feet, including nails, 

 white. Tail unicolor plumbeous gray. Lips encircled with 

 narrow white edgings." 



The color of the type and a topotype of S. stonei can be ex 

 actly matched by specimens from Massachusetts, Minnesota, -Iowa, 

 and North Carolina, of 8. cooperii. 



" Skull narrower,"*[not so,] "shallower, and viewed from above, 

 less angular than that of Cooperii," [not so,] "but of same length. 

 Lower jaws viewed from below, ditto" [exactly like specimens of 

 Cooperii]. "Incisors shorter, broader, and less cylindrical, with 

 sulcation of upper pair much more distinct " [characters entirely 

 inconstant]. "Zygomatic foramen longer and narrower " [not 

 so], "Sagittal suture and parietals relatively much longer; 

 interparietal tranversely narrower, longitudinally, longer'' 

 [characters not constant]. " Supraoccipital in cooperii twice as 

 wide as deep, in stonei thrice as wide as deep." 



In the type of stonei, the only specimen Mr. Ehoads had at 

 the time he described the species, this bone is so broken that its 

 shape cannot be seen. In a topotype of stonei I have examined, 

 I can find no difference from cooperii. 



" Molars one-third wider and one-eighth longer in stonei " 

 [width and length vary with age]. "In. cooperii the length 

 of the symphysis mandibuli just equals the distance from its 

 posterior end to the angle formed by the antero-inferior border 

 of the masseteric fossa; in stonei the symphysis is one-third 

 longer " [inconstant]. 



" Posterior face of angle of lower jaw in stonei very stout, 

 abruptly rounded, and recurved outward; in cooperii it is slender, 

 spatulate, elongated posteriorly in a nearly vertical plane, and 

 the margin below the condvle not thickened as in the former 

 species." 



