The Leimiiiii(/x of the (n'nu.s iSi/napfoiiiijs. 



63 



ii'i-KiH/i/i, and the reLMitnint angle on the outer side of the last lower molar 

 is much deeper and nearly forms a closed loop on the outer side of that 

 tooth. The upper incisor is narrower and the sulcus shallower than in 

 the other known species. 



Measaremeiilti (from dry skin). — Total length, a!)ont 112; tail vertebra-, 

 22; hind foot, IS. 



(Tciinrd remarks. — ■Midoiiu/x trncl diflei's markedly from the two othi'r 

 species now known in the fidlness of the molar looi)S and the depth of 

 the reentrant angle on the outer side of the last lower molar. I have 

 named the species in honor of j\Ir. F. W. True, curator of mammals in 

 the U. 8. National Museum. 



Synaptoniys (Mictoniys) -wiangeli .sj). no v. 



Tijpi' from Wrangel, Alaska, No. 74720, r^ ad., U. S. National ^luseum, 

 Department of Agriculture collection. Collected Septendjer (5, LSOri, by 

 Clark P. Streator. Original number 4S71. 



Generid rluiracters. — Similar to *S'. iniiniliis, but larger ; tiulaud hind foot 

 longer ; skull nari'ower. 



Culor. — LJi)per parts grizzled grayish brown, with a yellowish cast; 

 under parts plumbeous, tippid with whitish ; tail bicolor, brownish above, 

 whitish below, darker at tij). 



Cranialaml (liiifal cJiaraders. — The skull of Mlct(jini/s imoujiH, contrasted 

 with that of M. iunultus, is nar- 

 rower and higher; the zygomata 

 narrower and less spreading ante- 

 ii<jrly ; brain case narrower and 

 less de])ressed ; audital bulUe less 

 inflated anteriorly. The posterior 

 loop of the last upper molar is 

 nuich shorter; the reentrant angle 

 on outer side of last lower molar 

 shallower, and the enamel folds of 

 all the teeth more loosely spaced. 



Measitremeiits (taken in flesh). — 

 Type specimen : total length, 122 ; fig. 

 tail vertel)rfe, 23 ; hind foot, 19. 

 Average of two specimens from type locality: total length, 119.5; tail 

 vertebrfe, 22.5 ; hind foot, 19. 



-Skull of Miclomys 

 (type) Xi'A. 



vraniifli if 



BIBLIOGRAI'HY. 



2Wes of Papers Containing Original Matter Relating to the Genus Si/naptoiiii/s. 



1. 1857. Baird, Spencer F. — Mammals of North America, 1857. Orig- 



inal description of genus Synaptoinys and species >S. cooperi 

 (pj). 556-558). 



2. 1874. Coues, Elliott. — Synopsis of ?,Iuridie. <Proc. Acad. Nat. Sci., 



Phila., pp. 17o-19(;, 1874. Description and record (jf locali- 

 ties (pj). 192-194). 



10— Biol. Sue. Wash., Vol. X, 18'JG 



