TIlIiVOTIlORVS. 549 



.75 (.69), tarsus .70-.80 (.77), midiUe toe .55-.G2 (.HO). ILth. Mfxi.,,; 

 southern Texas.. 717. C. mexicanus (Swains.). White-throated Wren. 

 V. Smaller and lighter colored ; above varj'ing from dull brown to cinnamon- 

 grayish, the wings cinnamon-rusty, narrowly barred with dusky ; black 

 bars on tail narrower, those on outer feather usually less than .05 wide ; 

 length about 5.50-5.75, wing 2.20-2.40 (2.32), tail 2.00-2.40 (2.14), ex- 

 posed culmen .70-.85 (.76), bill from nostril .50-.66 (.58), tarsus .G5-.72 

 (.69), middle toe .48-58 (.51). Eggs .70 X -52. Hob. Southwestern 

 United States, north to "Wyoming, southern Idaho and Oregon, and 

 northern California, east to western Texas, Colorado, etc., south to 

 Mexican boundary and Lower California. (Resident throughout.) 



717((. C. mexicanus conspersus Ridow. Canon Wren.' 

 Larger (exposed culmen 1.10, tarsus 1.15); chin and throat pale tawny brown, 

 chest brighter tawnj- brown or russet; upper parts plain dark vandj-ke- 

 brown, becoming nearly black jjosteriorly and on wings, the latter without 

 distinct bars or other markings ; posterior lower parts deep bistre or Vandyke 

 (nearly black on thighs and flanks), the belly speckled with white ; wing 

 2.80, middle toe .90. llab. Southeastern Mexico (Mata Bejueo, Vera Cruz). 



C. sumichrasti Lawr. Sumichrast's Wren.' 



Genus THRYOTHORUS Yieillot. (Page 540, pi. CXXL, figs. 3, 5.) 

 Species. 



Common Char.\cters. — Above plain brown (rump sometimes with concealed 

 white spots), the tail barred, more or less distinctlj-, with dusk}-; a sharply defined 

 superciliary stripe of white or buffy ; color of lower parts very variable. Young 

 not essentially different from adults. Nest bulky, composed of sticks, spiders' 

 webs, feathers, etc., built in some cavity, as a hole in stump or hollow tree, various 

 odd nooks in buildings, etc. Eggs whitish, more or less speckled. 



a}. Feathers of rump with very distinct concealed white spots. 



6'- Tail-feathers rusty brownish, narrowly barred for entire length with dusky 

 and lighter rust}-. (Subgenus Thri/othorus. part.) 

 c". Smaller and lighter colored ; above rusty brown (varying much in 

 shade), duller on top of head, brighter on rump; an indistinct 

 blackish line along each side of crown, bordering the white or 

 buffy superciliary stripe ; wings narrowly and indistinctly barred 

 ■with dusky, the quills with pale rusty or rusty whitish spots; 



' Specimens from Colorado, Utah, Nevada, and other parts of the arid interior region alone constitute the 

 true C. contpermt ; examples from California, Lower California, Arijona, and New Afexico arc much darker 

 (being in coloration more like the true C. mrri'mnun), the difference bcins very marked and. so far as the larce 

 number of specimens now before me arc concerned, quite constant. The latter constitute the C mfr!<-nnnt 

 pnnriutntiii RiDGw. (Proc. V. S. Nat. Mus. v. Sept. 5, 1882, M:\), a race which will probably, in due time, bo 

 generally recogniied. 



» Calhcrpct lumichratl! L.VWR., Pr. Ac. Nat. .?ci. Phil. l?:i, 233. 



