While admitting the strong probability that the different brown _Pipilos_ with rufous throat bordered by black spots, _P. fuscus_, _crissalis_, _mesoleucus_, _albigula_, and probably even _albicollis_, are geographical modifications of the same original type, the large collection before us vindicates the action of those who have referred the California species to that described by Swainson as _fuscus_, and who have distinguished the _P. mesoleucus_ from both. The original description of _fuscus_ agrees almost exactly with _crissalis_, both actually scarcely separable; while the _mesoleucus_, intermediate in geographical position, is decidedly different from either. The relationships of these different forms will be found expressed in the general diagnosis already given. Two descriptions given by Swainson, copied below, of the _P. fuscus_, differ somewhat from each other, and may not have been taken from the same specimen. The identification of either with _P. mesoleucus_ would be a difficult matter; while the first one expresses the peculiar characters of _crissalis_ more nearly than any other. The statement of “white beneath,” without any qualification, applies better to _mesoleucus_ than to others, but the “pale rufous tinge” observable in _crissalis_ and _fuscus_ is very different from the abruptly defined chestnut cap of _mesoleucus_. _Pipilo fuscus_, SWAINSON, Phil. Mag. I, 1827, 434. “Gray, beneath paler; throat obscure fulvous, with brown spots; vent ferruginous. Length, 8.00; bill, .70; wings, 3.50; tail, 4.00; tarsi, .90; hind toe and claw, .70.” _Hab._ Table land; Temiscaltepec. _Pipilo fuscus_, SWAINSON, Anim. in Men. 1838, 347. “Grayish-brown above; beneath white; chin and throat fulvous, with dusky spots; under tail-coverts fulvous; tail blackish-brown, unspotted. Bill and legs pale, the latter smaller, and the claws more curved than in any other known species; crown with a pale rufous tinge. Length, 7.50; wings, 3.50; tail, 4.00; tarsus, .90; middle toe and claw the same; hinder toe, .65. Rather smaller than _maculata_.” [25] _Pipilo albicollis_, SCLATER. Above uniform olivaceous-brown; the cap not differently colored. Lores, chin, and throat white, the two last bordered and defined by dusky spots; jugulum and breast white, the former clouded with olivaceous, and with a dusky blotch in middle; middle of throat crossed by an olivaceous band which curves round on each side under the ear-coverts; sides grayish. Flanks behind, anal region, and crissum, rufous. Middle wing-coverts with a whitish bar across their tips. Fourth and fifth quills longest; first shorter than ninth and secondaries. Length, 7.00; wing, 3.30; tail, 3.70. Bill and legs light. _Hab._ Central Mexico.