BIRDS OF NORTH AND MIDDLE AMERICA. 



2(35 



AMPHISPIZA BILINEATA DESERTICOLA Ridgway. 

 DESERT SPARROW. 



Similar to A. h. Mlmeata, but averaging- larger: upper parts pal'er and 

 browner, and white spot at end of inner web of outermost tail-feather 

 much smaller. 



AdvH mah-.—Iuength (skins), 124.46-138.43 (130.56); wing. 64.01- 

 70.61 (67.31): tail, 60.96-68.33 (64.26); exposed culmen, O.lu-lO.67 

 (10.16); depth of bill at base, 5.59-6.35 (6.10); tarsus, 18.03-19.81 

 (19.05); middle toe, 12.70-13.97 (12.95); white spot on lateral tail- 

 feather, 2.54-11.43 (7.37).^ 



Adult female. — Length (skins), 121.92-132.08 (126.i;»); wing, 62.23- 

 66.01 (61.47): tail, 58.93-63.25 (60.20); exposed culmen, 9.14-10.41 

 (9.91): depth of bill at base. 5.59-6.35 (5.84): tarsus, 17.02-18.80 

 (18.29): middle toe, 12.45-12.70 (12.70): white spot on lateral tail- 

 feather, 4.32-9.65 (7.62).- 



Arid plains and deserts of southwestern United States and north- 

 western Mexico: north to northern Nevada and Utah, east to south- 

 western Colorado. New Mexico, and western Texas (El Paso, Fort Davis, 

 etc.), west to western Nevada, southern California (San Bernardino, 

 San Diego, and Los Angeles counties), and south throughout Lower 

 California'' and into Mexican States of Sonora and Chihuahua (Casas 

 Grandes). 



^ Seven spefimen;j. -' Nine specimens. 



^ Lower California specimens are doubtfully referred to this form. The thirteen 

 adult examples from the peninsula examined, including several from Cerros, Santa 

 Margarita, and Carmen islands, are mifortunately in very bad condition of plumage, 

 and therefore do not admit of satisfactory comparison with those from other districts. 

 Average measurements compare as follows: 



ocalitv. 



Wing. 



'pT•r^r>co<^ Depth Of 



culmen. 



bill at 

 base. 



Middle 

 toe. 



White 

 spot on 

 outer 

 tail- 

 feather. 



Seven adult males from Arizona, So- ' 

 nora, and Utah 67. 31 



Two adult males from La Paz and 

 Cape St. Lucas lU. 21 



One adult male from Carmen Island . ' ()3. .'lO 



One adult male from Santa Margra- 

 rita Island .=i9. 44 



Three adult males from Cerros Island. 0.5. 79 



FEMALES. 



Nine adult females from Arizona, etc' 61.47 



Two adult females from Cape St. 



Lucas and Ballaenas Bay 61. 47 



Two adult females from Santa Mar- 

 garita Island ' 57. 66 



Four adult females from Cerros Island ' 62. 23 



60.20 

 58. 93 



53. 85 

 61.98 



60.20 

 56. 39 



53.09 



57. 91 



9.91 

 10.67 



9.65 

 10.67 



9.91 

 10.41 



9.91 

 10.16 



5.59 

 6.35 



6.35 



5.84 

 5. 84 



5.33 



5. 59 



19. 05 



18. 03 



17.78 



18. 29 

 18.03 



IS. 29 

 IS. 03 



17.27 

 18.03 



12. 95 



12. 70 

 12.70 



10. 16 

 9.40 



12. 19 



12. 70 



12. 70 



12.19 

 12.70 



6.86 



4.06 



8.38 



^^ hile local distinction is strongly indit'ated 1)y the above measurements, a much 

 arger series will be required from the different localities to determine the question. 



