508 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Young. — Essentially like adults, but upper parts duller in color, with 

 lighter markings less conspicuous; black of pileum duller, more slaty; 

 back, scapulars, and rump mixed dusky and dull brown, the streaks 

 dull brownish buff (indistinct on rump); wing-bands buffy brown or 

 cinnamon-brown; tail-coverts very indistinctly barred; superciliar}^ 

 stripe pale bufiy. 



Adult male.—ljength (skins), 164-174 (166.4); wing, 70-77 (73.7); 

 tail, 64-70 (67); exposed culmen, 20-23 (22.2); tarsus, 24-26.5 (24.9); 

 middle toe, 17-18 (17.4). « 



Adult f67nale.—IjGngth (skins), 148-160 (156.3); wing, 67-69 (67.9); 

 tail, 58-65 (61.3); exposed culmen, 20.5-21 (20.9); tarsus, 22-23 (22.9); 

 middle toe, 16-16.5 (16.1).* 



Southeastern Mexico, in States of Vera Cruz (Mirador; Jalapa; Car- 

 rizal; Antigua; Paso del Toro; Chichicaxtla), Puebla (Rinconada),and 

 Oaxaca (Juquila; Pla^^a Vicente). 



Campylorhynchus rufinucha Lafresnaye, Rev. Zool., viii, 1845, 339 (Mexico). — 

 Baird, Review Am. Birds, LS64, 105, jmrt (Mirador, Vera Cruz).— Salvin 

 and GoDMAN, Ibis, 1889, 234 (Vera Cruz, Vera Cruz; crit. ). — Lantz, Trans. 

 Kansas Ac. Sci. for 1896-97 (1899), 224 (Rinconada, Puebla). 



ICumpylorhynchus'] rufinucha Gray, Hand-list, i, 1869, 192, no. 2645. — Sclater 

 and Salvin, Nom. Av. Neotr., 1873, 5. 



Picolaptes rufinucha Lesson, Descr. Mamm. et Ois., 1847, 285 (Vera Cruz). 



Campylorhynchus capistratus (not Picolaptes capistrata Lesson) Sclater, Proc. 

 Zool. Soc. Lond., 1859, 363 (Jalapa, Vera Cruz), 371 (Juquila and Playa 

 Vicente, Oaxaca). — Salvin and Godman, Biol. Centr.-Am., Aves, i, 1880, 

 64, part (Mexican localities).— Smarpe, Cat. Birds Brit. Mus., vi, 1881, 191, 

 part. 



HELEODYTES HUMILIS (Sclater). 



SCLATER'S CACTUS WREN. 



Similar to II. rufinucha., but smaller; chestnut of hindneck more 

 extended, invading the pileum (sometimes covering whole pileum), 

 the latter never black, but with center of feathers dusk}^,'' postocular 

 stripe chestnut-brown instead of black; middle rectrices more broadly 

 and conspicuously barred with dusky, and under parts usually 

 immaculate.*^ 



« Nine specimens. 



''Seven specimens. 



c In fresh autumnal and winter plumage the chestnut margins to the feathers of 

 the pileum are broader, greatly reducing (sometimes almost concealing) the dusky 

 centers; in midsummer they become worn away, the pileum then being dusky or 

 blackish, but always showing more or less distinct chestnut or rusty-brown margins 

 to the feathers. 



<* Occasional specimens show more or less speckling on sides and flanks, or on the 

 latter alone. In H. rufinucha the amount of speckling on the under parts is exceed- 

 ingly variable, sometimes but little greater than in certain si)ecimens of H. himilis. 

 One specimen of //. JtumUls, from El Limon, Guerrero, has the breast distinctly 

 speckled. 



