1926] GrinneU-Dixon : Two Neiv Races of the Pine Marten 413 



Geographic range. — Known definitelj^ only from within 50 miles 

 of the seacoast in Humboldt and Del Norte counties, California. 

 Evidence indicates probable occurrence, at least within historic times, 

 north through the humid coast belt from the vicinity of old Fort Ross, 

 Sonoma County, into Oregon ; but material from the latter State is 

 almost wanting, and nothing can now be said on any basis of fact as 

 to what happens suljspecitically between the California-Oregon line 

 and the type-locality of M. c. caurina (vicinity of Grays Harbor, 

 Washington). See accompanying map (fig. 9). 



Measurements. — The onlj^ reliable external dimensions available 

 for this subspecies are of an adult male (no. 35372, Mus. Vert. ZooL, 

 taken near Requa, Del Norte County, California, January 14, 1926), 

 as follows : Total length, 603 mm. ; tail vertebrae, 210 mm. ; hind foot, 

 84 mm. ; height of ear above crown, 35 mm. ; weight (lean), 755 grams. 

 The weight indicates an animal decidedly lighter than sierrae (nine 

 males of which average 988 grams) ; but the external dimensions fall 

 well within the range of those of sierrae. Cranial measurements are 

 given on the accompanying table. 



The last upper molar of the type of liumhoJdtensis measures : trans- 

 verse diameter 7.8 mm. ; anteroposterior diameter of heel 5.2. The 

 same tooth in the type of sierrae measures: transverse diameter 

 9.2 mm. ; anteroposterior diameter of heel 5.9. The same tooth in 

 caurina (no. 1063, coll. S. G. Jewett) measures: transverse diameter 

 8.6 mm. ; anteroposterior diameter of heel 5.5. 



Remarks. — Martes caurina huniholcltensis is sharply distinct from 

 M. c. sierrae. A series of seven martens at hand collected by Annie 

 M. Alexander and Louise Kellogg in the Trinity Mountain region 

 of northwestern California (see L. Kellogg, 1916, p. 355), while not 

 typical of sierrae are both externally and cranially very close to that 

 race and not, as might be expected, fairly intermediate toward 

 humholdtensis. Indeed, no specimens yet available to us indicate 

 intergradation between humholdtensis and sierrae. At the same time, 

 normal geographic intergradation probably takes place to the north- 

 ward between each of these races and cauri^ia. 



The only full specimen, that is, skin with skull and external 

 measurements, available is unfortunately abnormal as to cranial 

 characters (due apparently to early injurj')- And since the chief 

 characters of the new race lie in the skull, it has thus been necessary 

 to choose a skull-only for the type. Acknowledgment should here be 

 made of the vigorous efforts in our behalf, by Mr. Harry E. Wilder, 

 of Carlotta, to get specimens of this rapidly disappearing fur-bearer. 



