PETERSON : DESCRIPTION OF NEW RODENTS 165 
Transverse diameter of tibia at proximal end....................0.00000008- ccodoacoadeouneosusconcoqcoy ae0095000 12.5 mm. 
Antero-posterior diameter of tibia at distal end...............:.2....s00scc20se+ sesececnscecessecuessecesenseee 7 oe 
piransverseldiamenumonstibialatidistalye nc se cssseeseseeeeeteeers ae ee ee ae eee ee 7 ce 
Createst#l ens throiccal caneuniis.cst.c.seassrscestosetrscrec steve sehen ee eee ee es 15 oe 
Length of tuberosity of caleaneum Cesieeoee 
Vertical diameter of tuberosity of calcaneum)... .........-22-c0cccccccseececeseeeeensereseseeseenessneraneees Uc)! ee 
Transverse diameter of tuberosity of calcaneum............-.-:1:ccseecceeceececesteeceeeecescceeeaeenseeseeees 4 Ue 
Width of sustentacular facet of calcaneum .............-..00.:.0cceeeeescececsecececesecnecersecesseneseesecees 
Greatest width of caclaneum at sustentacular facet 
Gireatestglenpthvohiastragalisisses- cs sesctseacheccus se cece ee saetecee ne secon ecise eee eee ee eee eeesteaees te 
Greatestawidthyoffastragalushats...cs.ceccs se sctvese aoc one chcwn usecase sescnewen eee nace ane coat eeee DEAR me eee 7 ie 
Antero-postenlon diameteriof euboide-essess-cs-ceeesesteese siete soe eeeseneeeseceeeeceeceeteceee eee ees erence 6 es 
sliransverse; diam eter Of CabOi dss. so. cess accrediation ee 4 of 
IRIGTANTE Oe GLOISYOIG Canaasonconeaeestopbeteet Beane ceaes ech aen chacooh prance socbbEaoademacmonaanad 
Length of metatarsal I 
eng thyofsm etatarsalellitaccs.2. cc decseace spacers ses te guaces da siescioeseen seea gues st aceevecttete oe seteeet nemeareonaaes 14 a 
Beng thpolimetatarsa lille ceccat esos emesis Sooo ea eae Se SSE co BEE ERE Se eet 
Length of metatarsal 1V.. 
WWenethyrofem eta tarsaley siecaccnaccendesance cote ee aoc esae een aa nee SESE CIES Sie cIR EE Hw eta Se inate ate inte fe 
Henethrofsungualyphalanxoffonrbhidigiteessssceesssessesseeesscceecee ee ete eieest eae eee ce cne eee ease ere: 9 re 
Length of ungual phalanx of second digit (approximately) .........0002.00ece.0cseeceeneenceceenteseeeees 10 ue 
RESTORATION OF STENEOFIBER Fossor. Pl. XIX. 
The type-specimen (No. 1217) is used as basis for this restoration. The scapula, 
however, and four of the anterior ribs in the illustration are drawn from the cotype 
(No. 1208). The greater portion of the fore-foot is reconstructed from the specimen 
No. 1204, which has also been referred to in the foregoing pages. 
The articulated skeleton presents a number of interesting features. ‘The most 
noticeable are: The cranium, which is unusually large in comparison with the body ; 
the short neck; the long and narrow scapula; and the powerful limbs and feet. The 
thoracic cavity is quite large, equaling or perhaps exceeding, that of Cynomys or 
Aplodontia. The lumbar region is short and strongly built, as in Aplodontia. The 
pelvic region is even stronger than in either Cynomys or Aplodontia, and is in some 
respects more like that of Castor. The tail is round, rather heavy, and of moderate 
length. 
The length of the fore limb of S. fossor, in comparison with the hind limb, is 
similar to that in Cynomys, Aplodontia, and Castor. The latter genera have the fore 
limb (the feet excluded) from 12 to 14 mm. longer than the hind limb; while S. 
fossor has the fore limb 10 mm. longer than the hind limb. 
The skeleton of S. fossor has many features similar to those of Cynomys and 
Geomys, but, on the whole, it is perhaps more like Aplodontia. There are many 
cranial characters, together with the longer and broader ungual phalanges, and the 
much longer caudal region, which are very different from Aplodontia. 
