54 



NORTH AMEEICAIT FAUITA. 



[No. 38. 



Remar'hs. — The only-knowTi specimen of this form is imperfect; it 

 lacks complete data, the pelage is ragged and apparently faded, 

 and the posterior portion of the braincase is broken away. Aside 

 from its many other distinctive characters, Scalopus injlatus can easily 

 be separated from all other members of the genus by the peculiarly 



inflated prelachrymal region of 

 the skull. It was at first thought 

 that this inflation was due to 

 parasites; but the bilateral sym- 

 metry of the inflations, the fact 

 that no apparent work of para- 

 sites has been noticed in this re- 

 gion of the skull in the many 

 hundred specimens of Scalopus 

 examined, and, further, the fact 

 that a very slight and inconspic- 

 uous tendency toward prelachry- 

 mal inflation is present in all 

 members of the genus, leads to 

 the behef that the inflation in 

 this species is an extreme accen- 

 tuation of normal development. 



Specimen examined. — One, the 

 type. 



Genus SCAPANUS Pomel. 



Scapanus Pomel, Archives Sci. Phys- 

 iques et Nat., tome 9, p. 247, Novem- 

 ber, 1848. 



Scaphanus Herrick, Geol. and Nat. Hist. 



Sm-v., Minnesota, Bui. 7, p. 55, 1892. 

 Scapasius Beddard, Cambridge Nat. 

 Hist., vol. 10, p. 518, 1902. 



Type species. — Scalops town- 

 sendii Bachman. 



GeograpJiic range. — South- 

 western British Columbia (Fraser 

 River region) , western and south- 

 ern Washington, western Ore- 

 gon, extreme western Nevada, 

 California (except the southeastern desert region), south to San Pedro 

 Martir Mountains, Lower California (figs. 7 and 12). 



External cJiaracters. — Body robust, depressed; tail short, round, 

 thick and fleshy, tapering apically and slightly constricted proxi- 

 mally, indistinctly annulated, scantily haired with coarse hairs 



B2013-103 



Fig. 7.— Geographic range of the species and subspe- 

 cies of Scapanus except S. orarius (see fig. 12). 



1. S. townsendii. 6. S. I. minusculus. 



2. S. latimanus lafimanus. 7. S. I. dilatus. 



3. S.l. occuUus. 8. S. I. alpinus. 



4. S. I. grinnelli. 9. S. anthonyi. 



5. S. 1. sericatus. 



