64 



CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th See. 



DIAGRAM SHOWING INTER-RELATIONSHIPS OF PACIFIC 

 COAST RACES OF THRYOMANES BEWICKI. 



Island forms; 

 discontinuous variation. 



Mainland forms; continuous varia- 

 tion. Dark to light coloration, short 

 tail to long tail. 



VANCOUVER ISLAHB 

 "CALOPHOHUS" 

 (Pale color) 



HBSOPBIUJS 

 (Dark color; 

 short tail) 



CATALIHAS 

 (Dark color; large bill 

 and feet; long tail) 



IREMOFHILVS 



LHJCOPHKJfS 

 {Pale color; short tail) 



DETAILED DISCUSSION OF CALIFORNIA RACES 

 Thryomanes bewicki marinensis Grinnell. 



Type locality — Nicasio, Marin County, California. 



Range — The humid coast belt north of the Golden Gate, at 

 least to Humboldt Bay; probably to the Oregon line. 



Specimens examined from the following localities : Hum- 

 boldt County: Capetown, 1; Ferndale, 1. Mendocino 

 County : Covelo, 7 ; Sherwood, 3 ; Willits, 1 ; Gualala, 3. 

 Sonoma County: Guerneville, 5; Freestone, 2; Fulton, 1. 

 Marin County: San Geronimo, 14; Nicasjo, 3; Inverness, 8. 

 Total, 49. 



Distinguishing characters — Similar to T. b. spilurus, of the 

 coast region immediately south of San Francisco Bay, but 

 dorsal coloration appreciably darker. Compared with calo- 

 phonus as represented on Vancouver Island, marinensis is 



