420 OENITHOLOGY. 



At Carson City the Rock Wren was migratory, not making its appear 

 ance during the season of our stay until the 20th of March, and first singing 

 on tlie 30th of that month. Indeed, wo saw it nowhere during the winter, 

 and thus infer that It makes a complete migration southward. 



List of si>eciniens. 



1C3, (? ad.; C^V^_9,L_oi_2-r__i |_a_oi_i3. 104, 5 ad.; G-9-2J-2 J^ji- 

 li— Ly^. West Humboldt Mountains (Camp 18), September 4, 1867. Upper mandible, 

 uniform slaty born-color, with lilaceous cast; end of the lower mandible similar, fading 

 on middle portion into asby-lilac — pale-yellowish basally and on angle of mouth ; iris, 

 olive; tarsi and toes, deep black. 



253,$ ad.; West Humboldt Mountains (Camp 19), October 23. G— 9— 2|i|— 2/^— 

 11 — ^ — 2§ — ii Upper mandible, purplish-slaty; lower, pale slatylilaceous, darker 

 terminally, more pinkish at base; iris, oli%'aceous-drab; tarsi and toes, slate-black. 



458, <?ad.; Carson, March 25. G — 9 — 3 — 2i. Bill, uniform slate, lower mandible, 

 paler ; iris, grayish-umber ; tarsi and toes, black. 



478, <? ad.; Carson City, Nevada, March 30, 18G8. SJ— 9— 2J— 2-j\. Bill, uniform 

 plumbeous-slate, lower mandible, paler, except terminally ; iris, grayish-umber ; tarsi 

 and toes, black. 



4SG, <? ad.; Carson City, April 3. C^— 9J— 3^,,— 2J. Bill, uniform dull-slate, basal 

 half of lower mandible, slaty bluish-white; iris, raw-umber; tarsi audtoes, deep black. 



Catherpes MEXICANUS. 



White-tlii'oated Wieii. 



/?. conspersus — Canon Wren. 



Catherpes mexicanus, Baird, B. N. Am., 1858, 35G ; Cat. N. Am. B., 1859, No. 263 ; 



Review, 18G4, 111.— Cooper, Orn. Cal., 66.— Coues, Key, 1872, 85; B. N.W., 



1874, 28. [Not Thryothorus mexicanus, Swains.] 

 Catherpes mexicanus var. conspersus, Ridgway, Am. Nat., 1872, 2. — B. B. & R., 



Hist. N. Am. B., I, 1874, 139, pi. viii, fig. 4.— CouES, Check List, 1873, No. 



46, p. 125.— Henshaw, 1875, 181. 



Somewhat similar to the common Rock Wren (Salpincfes) in its distri- 

 bution and habits, this remarkable species differs in many noteworthy 

 respects, the principal of which are its appearance and notes. We found it 

 everywhere more rare than the other species, and apparently confined to the 

 more secluded portions of the mountains, where it frequented rocky gorges 

 and the interior of caves more often than the piles of loose rocks on the open 

 slopes. It was generally observed to be rather shy, and prone to elude 



