652 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Adult male. — Pileum, hindneck, back, and scapulars deep brownish 

 mouse gra}^ or dark drab-gra}^, streaked with black and sparsely 

 speckled with white, the white apical specks very minute on pileum, 

 nearly absent from greater part of back, larger on lower back and pos- 

 terior scapulars; rump dark fawn color, the feathers with conspicuous 

 roundish terminal spots of white and with two or more larger transverse 

 spots of black; upper tail-coverts paler fawn color, broadl}" barred 

 with black and with a roundish or triangular white terminal spot; 

 middle rectrices grayish brown, rather broadly barred with dusky; 

 other rectrices similar, but dusky bars less distinct, crossed by an 

 interrupted'^' subterminal band of cinnamon-buff or deep pinkish buff, 

 this immediately preceded by a broader and continuous but rather 

 irregular band of black; outermost rectrix with an additional black 

 and buff' band on inner web, the outer web with four large buff spots; 

 wings vermiculated with grayish brown and dusky, the smaller cov- 

 erts speckled with black and wdiite; under parts white, the sides and 

 flanks tinged with pale fawn color; throat and chest thickly marked 

 with large spots of dusky, more or less transverse, varying from tri- 

 angular to transverse diamond-shaped and subrounded; breast, abdo- 

 men, and anterior portion of sides thickly marked with similar but 

 smaller and more decidedly transverse spots, the flanks with regular 

 transverse bars of dusky brown; under tail-coverts broadl}^ barred 

 with black; axillars and under wing-coverts broadl}^ barred with 

 dusky; bill horn color, the mandible paler basally; iris "dark black;"* 

 legs and feet dusky brown; length (skin), 124; wing, 69.6; tail, 48; 

 exposed culmen, 20; tarsus, 20.5; middle toe, 14.5.^ 



Adult female. — Similar to the adult male, but under parts more 

 tinged with brownish buff (strongly so on flanks) and the spots and 

 bars more brownish dusky; length (skin), 124.5; wing, 68; tail, 46.5; 

 exposed culmen, 18.5; tarsus, 20.5; middle toe, 14. '^ 



North-central Guatemala (Toyabaj, department of Quiche). 



This very strongly characterized form (as compared with the differ- 

 ent forms of S. ohsoletus) seems, as nearly as I am able to judge from 

 descriptions, to be intermediate in coloration between S. guttatus of 

 Salvador and 8. fasciatus of Nicaragua. Without specimens for com- 

 parison, however, I can do no more than describe it, and call attention 

 to the need of very careful stud}^ of these Central American rock 

 wrens, which at present seem to involve anomalies in geographic 

 range, while our knowledge of their relationship to one another is 

 extremel}^ unsatisfactory. 



Salpincles maculatus Ridgway, Proc. Biol. Soc. Wash., xvi, Nov. 30, 1903, 169 

 (Toyabaj, department of Quiche, Guatemala; coll. U. S. Nat. Mus. ). 



« Each rectrix has the buff ol opposite webs separated by a blackish shaft-streak. 

 & Heyde and Lux, manuscript. 

 cOne specimen (the type). 



f^One specimen (no. 150905, coll. U. S. Nat. Mus., Toyabaj, Quich(5, Guatemala, 

 Mar. 13, 1892; Heyde and Lux). 



