BIEDS OF NORTH AND MIDDLE AMERICA. 201 



73.66 (70.61); tail, 46. 99-53. 3i (50.55); exposed culmen, 11.43-12.70 

 (11.43); depth of bill at base, 7.11-8.13 (7.37); tarsus, 21.59-22.86 

 (22.35); middle toe, 16.00-18.03 (17.02).^ 



AduUfemaJe.—l^Qngih (skins), 119.38-129.54 (125.48); wing, 65.53- 



68.33 (66.80); tail. 46.48-50.29 (48.51); exposed culmen, 11.68-12.45 

 (12.19); depth of bill at base, 7.11-7.37 (7.24): tarsus, 19.81-22.35 

 (20.83); middle toe. 15.75-16.51 (16.00).' 



San Benito Island, Lower California. 



This is merely an insular form of I\ rostratuix. The bill averages 

 exactly the same in Iwth forms, both in length of culmen and basal 

 depth. Some specimens are scarely to be distinguished b}" color, but 

 the average difference is very decided and quite sufficient to separate 

 the two forms subspecificallj'. 



Fasserculus guttatus (not of Lawrence) CouEsand Streets, Bull. V. 8. Nat. Mus., 



no. 7, 1877, 10, excl. syn. (San Benito I., Lower California; orit.)- 

 Fasserculus sanctorum Cones Ridgway, Proc. L". S. Nat. Mus., v, sig. 34, ^Nlar. 



21, 1883, 538, in text (San Benito I.; nomen nudum!). 

 F.[^(^isserculus'] sanctorum Ridgway, Proc. V. S. Nat. Mus., v, 1883, 538, 539, in 



text (crit.).— CouES, Key N. Am. Birds, 2d ed., 1884, 364 (San Benito L, 



Lower California; U. S. Nat. Mus.). 

 Ammodramus (Fassercidus) sanctormn Coues, Auk, xiv, Jan., 1897, 92. 

 Ammodramus sanctorum American Ornithologists' Union Committee, Auk, xiv, 



Jan., 1897, 121 (Check List, no. 544.1) .—McGregor, Auk, xv, 1898, 264 



(descr. young). 



PASSERCULUS ROSTRATUS GUTTATUS (Lawrence). 

 ST. LUCAS SPARROW. 



Similar to T*. r. rosf/ydus but smaller, with relatively smaller and more 

 slender bill and with the coloration darker; upper parts grayish olive 

 or hair brown, the pileum with narrow streaks of duskj^, the back and 

 scapulars with very broad streaks, or longitudinal mesial spots, of 

 dark sepia brown; under parts white, shaded with light hair brown or 

 grajish olive on sides and flanks; sides of throat, chest, sides, and 

 flanks conspicuously streaked, the streaks blackish brown medial!}^ 

 (broadly), light hair brown along edges. Length (skins), 123.19-124.46 

 (123.70); wing, 63.50-64.77 (64.01); tail, 47.50-47.75 (47.62); exposed 

 culmen, 11.18; depth of bill at base, 5.59-6.10 (5.84); tarsus, 20.57- 



21.34 (20.83); middle toe, 14.99-15.75 (15.24).^' 



Southern portion of Lower California (San Jose del Cabo) in winter; 

 breeding range unknown. 



Fasserculus guttatus Lawrence, Ann. Lye. Nat. Hist. N. Y.,viii, ]May, 1867, 473 

 (San Jose del Cabo, Lower California; JJ. S. Nat. Mus. ). — Cooper, Orn. Cal., 

 1870, 185.— Baird, Brewer, and Ridgway, Hist. N. Am. Birds, i, 1874, pi. 25, 



^ Five specimens. 

 ^ Four specimens. 

 ^Two specimens, one of them an adult male, the other with sex undetermined. 



