ALLEN: AMERICAN COLLARED LEMMINGS. 533 



Measvrements. — The type measured in the flesh as follows: — total 

 length 146 mm.; tail 17; hind foot 20. 



The skull of the type lacks the occipital portion; it measures: — tip 

 of nasals to posterior border of interparietal 28.5 mm.; nasals 9.1; 

 palatal length 18; diastema 10.2; zygomatic width 20; interorbital 

 width 4.5; upper molar row (alveoh) 8; lower molar row (alveoli) 7.9. 



Geographic distribution. — This insular species is confined to St. 

 LauTence Island, where like the large Microtus innuitiis, it seems to 

 have become differentiated through isolation. 



Reviarhs. — This is a very gray, bleached-appearing species com- 

 pared with the Alaskan rubricatus. But four specimens were taken 

 b}^ Mr. DLxon during his brief stay at St. Lawrence Island. One 

 of these was a subadult female, containing four embryos, June 24th. 

 Two other specimens of about the same age agree with this last in 

 having a somewhat browner tint to the back than the type, an older 

 animal. Nelson, as long ago as 1887, recorded the lemming as com- 

 mon on this and the Bering Strait Islands. 



Specimens examined. — Four from St. LawTence Island (M. C. Z.). 



DiCROSTONYX GROENL^NDICUS (Traill). 



Greenland Collared Lenmiing. 



Mils groenlandicus Traill, Scoresby's Journ. voyage northern whale-fishery, 



1823, p. 416. 

 Lemmiis htidsonius Sabine, Parry's voyage.. Suppl. to app., 1824, p. clxxxviii 



(•=188). 

 Lemnus (sic) groenlandicus Schinz, Synopsis Mamm., 1845, 2, p. 256. 

 Hyptidaeiis groenlandicus Reinhardt, Rink's Gr(^nl. geogr. stat. beskriv., 1857, 



p. 8. 

 Myodes torquatus var. gr<j>nlandicus Brown, Proc. Zool. soc. London, 1868, p. 



350. 

 Myodes groenlandicus Wagner, Schreber's Saugethiere. Suppl, 1843, 3, 



p. 606. 

 Myodes torquatus Feilden, Zoologist, 1877, ser. 3, 1, p. 320. 

 Cuniculus torquatus Greely, Three years of Arctic service, 1886, 2, p. 363 



(part) . 

 Dicrostonyx torquatus Miller, N. Amer. fauna, 1896, no. 12, p. 38-40 (part). 

 Dicrostonyx hudsonius Elliot, Field Columbian mus. publ. Zool. ser., 1901, 



2, p. 209 (not Mus hudsonius Pallas, 1778). 

 Dicrostonyx hudsonius groenlandicus Jacobi, Abh. u. ber. K. zool. anthrop.- 



ethnogr. mus. Dresden, 1911, 12, no. 4, p. 8. 



