THRYOTHORUS. 5B 
(53), tarsus .62-.75 (.67). Hggs 67 x 50. Hab. Eastern United 
States, rare and local east of Alleghanies and north of 40°; 
west to edge of Great Plains; winters in more southern dis- 
tricts (Georgia to eastern Texas), 
719. T. bewickii (Aup.). Bewick’s Wren. 
@. Top of head, back, etc., duller or grayer brown. 
e'. Decidedly brown above (of a shade closely approximating a 
medium tint of bistre), the middle tail-feathers more gray- 
ish brown, similar to or in very slight contrast with color of 
back ; flanks strongly brownish ; length about 5.00-5.50, wing 
2.00-2.15 (2.08), tail 2.08-2.30 (2.15), exposed culmen .52-.60 
(55), tarsus .62-.75 (.72). Eggs 64.50. Hab. Pacific 
coast, north to British Columbia, south to San Francisco. 
(89.) 719a. T. bewickii spilurus (Via.). Vigor’s Wren. 
é. More grayish brown above, the upper tail-coverts and middle 
tail-feathers distinctly gray (often pure ash-gray), in de- 
cided contrast with color of back; flanks ash-gray; length 
5.00-5.75, wing 2.10-2.40 (2.21), tail 2.10-2.55 (2.28), exposed 
culmen .50-.60 (.56), tarsus .68-.78 (.70). Eggs .65 x .49. 
Hab. Table-lands of Mexico and contiguous portions of 
United States (southern and western Texas to southern 
California, and north to southern Utah, Colorado, and 
middle Kansas). 
719d. T. bewickii bairdi Sav. & Gopm. Baird’s Wren: 
a, Feathers of rump without distinct (if any) concealed white spots. 
b'. Wing less than 2.00; flanks dull ash-gray; tail dull grayish brown, nar- 
rowly and indistinctly barred with dusky, the two or three outer 
feathers spotted at tips with light brownish gray, their inner webs 
nearly uniform dusky. (Subgenus Thryomanes Sct., part ?) 
Very similar, otherwise, in color to 7. bewickii spilurus ; length about 
4.50, wing 1.85-1.90, tail 1.80, exposed culmen .67-.70, tarsus .70- 
15. Hab. Guadalupe Island, Lower California. 
720. T. brevicaudus Ripew. Guadalupe Wren. 
b%. Wing decidedly more than 2.00; flanks buffy, ochraceous, or brown; tail 
brown, broadly barred with dusky. (Subgenus Zhryothorus, part ?) 
c’. Lower parts unspotted. (Above grayish brown, more russet on top of 
head.) 
@, Lower parts ochraceous, paler along middle line, and white on 
chin and throat; sides of head heavily streaked with black, the 
throat bordered laterally by a distinct black line; length about 
5.00-5.50, wing 2.10-2.35, tail 2.25-2.35, bill from nostril .39- 
1 Specimens from western Mexico (Guadalajara) are not typical, being much larger than those from Cali- 
fornia and Lower California, the wing averaging 2.27, the tail 2.28, and exposed culmen .59; their coloration, 
however, is not obviously different. 
