Dr. Cooper, in his paper on the Fauna of the Territory of Montana, states that he observed this bird occasionally through the main Rocky Mountain chain to near the crossing of the Bitterroot, but it was less common than among the cliffs and rocks of the barren plain along their eastern slope. Though he did not find it in the western part of Washington Territory, he has no doubt that it frequents parts of the rocky cañons of the Columbia Plain. A nest with nine eggs was found in a log-cabin below Fort Benton. GENUS CATHERPES, BAIRD. _Catherpes_, BAIRD, Birds N. Am. 1858, 357. (Type, _Thryothorus mexicanus_, SW.) GEN. CHAR. Bill longer than the head, slender; all the outlines nearly straight to the tip, then gently decurved, gonys least so; nostrils linear; tarsus short, about equal to the middle toe, which reaches to the middle of the middle claw. Outer toe considerably longer than the inner, reaching beyond the base of the middle claw. Wings a little longer than the tail; the exposed portion of the first primary about half that of the fourth and fifth. Tail-feathers very broad and perfectly plane; tail nearly even; the two lateral graduated; the outer about eleven twelfths of the middle. [Line drawing: _Catherpes mexicanus._ 3969 ♂] This genus agrees with _Salpinctes_ in the broad, plane tail-feathers, but the bill is much longer, the nostrils linear, not oval, the feet much stouter, the outer toe rather longer; the tarsus shorter, being equal to the middle toe, not longer; the hind toe much longer than the outer lateral, instead of equal to it. The wings are but little longer than the tail, and shorter than in _Salpinctes_. This genus is confined to the western portions, where a single species, _C. mexicanus_, occurs in two well-marked varieties:— C. mexicanus. Culmen almost straight, the tip decurved, gonys straight. Above blackish-brown; wings and back sparsely sprinkled with minute white specks; _no such markings on head or neck_. Bars on tail very broad, .12 in width on outer feathers. Wing, 2.84; tail, 2.40; culmen, .96; tarsus, .75; middle toe, .68; posterior, .47; outer, .52; inner, .49 (52,791, Mazatlan, Mexico). _Hab._ Mexico … var. _mexicanus_. Culmen and gonys both gently curved, the latter somewhat concave. Above cinnamon-ashy, more reddish on rump and wings; head and neck above with numerous dots of white; very few of these on back and wings. Tail-bars very narrow and thread-like. Wing, 2.48; tail, 2.12; culmen, .83; tarsus, .56; middle toe, .52; posterior, .35; outer, .44; inner, .36 (53,425 ♂, Fort Churchill, Nevada). _Hab._ Middle (and Pacific?) Province of United States … var. _conspersus_. [Illustration: _Catherpes mexicanus._]