210 



THE CONDOR 



Vol. XX 



The type of Lanius ludovicianus nelsoni is a winter bird, chosen because in perfect 

 plumage, but we have also breeding specimens from Todos Santos, Lower California, the 

 type locality, both in worn breeding plumage and in juvenile plumage, and these show 

 plainly the distinctive characters of large bill and small white tail-markings. One exam- 

 ple from La Paz, Lower California (no. 196171, U. S. Nat. Mus.), taken December 23, 

 1905, is decidedly darker than the type, which latter represents the normal coloration. A 

 single bird from Rosarito, the northernmost locality for Lanius ludovicianus nelsoni, 

 seems to be entirely typical, and indicates the extent of the geographic distribution of 

 this form in that direction. 



While Lanius ludovicianus nelsoni is the breeding form of Lower California, Lan- 

 ius ludovicianus gambeli occurs there in winter, even as far south as the Cape San Lucas 

 region, as the following three specimens in the Biological Survey collection show: no. 

 196165, U. S. Nat. Mus., male, Santo Domingo, Lower California, September 27, 1905; no. 

 19616S, U. S. Nat. Mus., female, Magdelena Island, Lower California, November 24, 1905; 

 and no. 196175, U. S. Nat. Mus., male, San Jose del Cabo, January 6, 1906. 



Detailed measurements of this new race are given below for purposes of compari- 

 son. 



MEASUREMENTS OF SPECIMENS OF LAN/US LUDOVICIANUS NELSONI, ALE FROM 

 LOWER CALIFORNIA, AND TAKEN BY E. W. NELSON AND E. A. GOLDMAN UN- 

 LESS OTHERWISE INDICATED 



u. s. 



Nat. 

 Mus. 



Sex 



Locality 



Date 



Wing- 



Tail 



T3 

 to <u 



X 11 



H2 Hi 





No. 















H o 



5 3 



*°. 



149925 



[*] 



vix ad. 



Santa Margarita Id. 1 



May, 1888 



99.5 



100.0 



16.5 



29.0 



17.5 



25438 





S 



Todos Santos 2 





98.0 



107.0 



18.8 



28.5 



17 3 



196172 3 





$ 



Todos Santos 



Dec. 26, 1905 



98.0 



101.5 



16.0 



29.0 



17.0 



196167 





6 



Rancho, Santo Do- 





















mingo, 25 mi. S. 



Nov. 14, 1905 



99.0 



101.5 



16.5 



28.5 



17.0 









San Jorge 















196171 





$ 



La Paz 



Dec. 23,1905 



99.0 



103.0 



17.0 



27.3 



16.0 









Average of five 



males: 



98.7 



102.6 



17.0 



28.5 



17.0 



149924 



9 



vix ad. 



Santa Margarita Id. 1 



May 2, 1888 



96.0 



101.0 



15.5 



27.0 



16.0 



196169 





[$] 



Santa Margarita Id. 



Nov. 29, 1905 



95.5 



97.5 



16.0 



27.5 



17.0 



196170 





9 



Llano de Yrais 



Dec. 13,1905 



96.0 



101.0 





25.5 



15.0 



196164 





9 



Rosarito 



Sept. 24, 1905 



98.0 



101.0 



16.0 



27.3 



17.0 



196166 





2 



Calmalli 



Sept. 29, 1905 



95.0 





16.0 



27.0 



17.0 









Average of five 



females: 



96.1 



100.1 



15.9 



26.9 



16.4 



^Collector unknown. 

 Collected by J. Xantus. 

 3 Type. 



Washington, D. C, October 15, 1918. 



