TIIRVOTHORUS. 551 



(.53), tarsus .G2-.75 (.67). Eggs .G7 X -50. Hah. Eastern United 

 States, rare and local east of Alleghanics and north of 40" ; 

 west to edge of Great Plains ; winters in more southern dis- 

 tricts (Georgia to eastern Texas). 



719. T. bewickii (Aid.). Bewick's Wren. 

 cP. Top of head, back, etc., duller or graj-er brown. 



c'. 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), expo.sed culmen .52-.60 

 (.55), tarsus .62-.75 (.72). Eggs .64 X .SO. Hab. Pacific 

 coast, north to British Columbia, south to San Francisco. 

 (89.) 719rt. T. bewickii spilurus (Vio.). Vigor's Wren. 



e'. More graj-ish brown above, the ujjper tail-coverts and middle 

 tail-feathers distinctly gray (often pure ash-gra^-), 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. 

 Hah. 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). 



7196. T. bewickii bairdi S.\lv. & Godm. 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 grajish 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 Scl., part ?) 



Very similar, otherwise, in color to T. bewickii spihinis ; length about 

 4.50, wing 1.85-1.90, tail 1.80, exposed culmen .67-.70, tarsus .70- 

 .75. Hab. Guadalupe Island, Lower California. 



720. T. brevicaudus Ridgw. Guadalupe Wren. 



6'. AVing decidedly more than 2.00; flanks huffy, ochraccous. or brown; tail 



brown, broadlj- barred with dusky. (Subgenus Thryothonis. part ?) 



c". Lower parts unspotted. (Above grayish brown, more russet on top of 



head.) 



d}. 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, hill from nostril .39- 



' Specimens from western Mexico (Oimdalajara) arc not typicnl, bcinp much larRor than tliose from Cali- 

 fornia ami Lower California, tlic wing averaging 2.27, the tail 2.2S, and exposed culmen .59 ; their coloration, 

 however, is not obviously diCTcrent. 



