SP. CHAR. Exposed portion of bill nearly as long as the head. Above dark rusty-brown, most vivid on the rump. A whitish streak over the eye, bordered above with brown. Chin white; rest of under parts dark brownish-red; the under tail-coverts and sides of the body barred with dusky. Exposed surface of wings and tail barred throughout with dusky. Legs flesh-color. Length, 5.25; wing, 2.25; tail, 2.12. HAB. Valley of Rio Grande. The distinctive features of this race will be found indicated on page 141. This form bears to the _T. ludovicianus_ about the same relation that _Harporhynchus longirostris_ does to _H. rufus_; and is hardly to be considered a distinct “species” from it. It should be noted that in both cases the lengthened bill and deeper color belong to the Rio Grande. It has not yet been met with north of the Rio Grande, but doubtless extends into Texas. Nothing is known of its habits. SUBGENUS THRYOMANES, SCLAT. _Thryomanes_, SCLATER, Catal. Am. Birds, 1861, 21. (Type _Troglodytes bewickii_.) [Line drawing: _Thryothorus bewickii._ 2047 ♂] There are three strongly marked geographical varieties of “Bewick’s Wren,” separable by quite constant characters. Of these the Mexican (_leucogaster_) and the typical form from eastern North America (_bewickii_) differ most in coloration, while the western (_spilurus_) is intermediate in this respect, but with a longer bill than in the other two. The peculiarities of the three forms are expressed on page 141. Thryothorus bewickii, var. bewickii, BONAP. BEWICK’S WREN; LONG-TAILED HOUSE WREN. _Troglodytes bewickii_, AUD. Orn. Biog. I, 1831, 96, pl. xviii.—IB. Birds Am. II, 1841, 120, pl. cxviii. _Thryothorus bewickii_, BONAP. List, 1838.—BAIRD, Birds N. Am. 1858, 363. _Telmatodytes bewickii_, CAB. Mus. Hein. I, 1850, 78. _Thryothorus bewickii_, var. _bewickii_, BAIRD, Rev. Am. B. 1864, 126. SP. CHAR. Above dark rufous-brown; rump and middle tail-feathers sometimes a little paler, and very slightly tinged with gray, and together with the exposed surface of secondaries distinctly barred with dusky. Beneath soiled plumbeous-whitish; flanks brown. Crissum banded; ground-color of quills and tail-feathers brownish-black. Length, 5.50; wing, 2.25; tail, 2.50. Length from nostril, 39; along gape, 70. HAB. Eastern Province of United States.