About Anabacerthia striaticollis Lafresnaye, 1841
Anabacerthia striaticollis, commonly called the montane foliage-gleaner, is a medium-sized furnariid with a wedge-shaped bill. Adults measure 16 to 17 cm (6.3 to 6.7 in) in length and weigh 22 to 28 g (0.78 to 0.99 oz). Males and females have identical plumage. The nominate subspecies A. s. striaticollis has a mostly dark brown face with faint pale flecks and a wide pale tawny-buff eyering that extends as a streak behind the eye. Its crown, nape, and upper back are dull dark brown with faint buff spots; the remainder of the back and rump are rich brown, and its uppertail coverts are a slightly paler brown. Its tail is rufous, with bare feather shafts at the very tips of the feathers. Its wings are mostly rich rufescent brown. The chin and throat are pale tawny-buff, with brown flecks on the chin. The breast is light brown with blurry buff streaks, the belly is unstreaked medium brown, and the flanks are slightly darker brown with a rufescent tinge. Its iris ranges from brown to dark brown; its bill is grayish horn to olive-gray, with the mandible sometimes a lighter shade; its legs and feet are yellowish brown. Juveniles have a darker crown, a more prominent eyering, and are overall more rufous than adults. Each of the recognized subspecies differs from the nominate in coloration. A. s. anxia has more yellowish buff eyering, postocular stripe, throat, and breast than the nominate, and its uppertail coverts are the same rufous color as its tail. A. s. perijana is paler than the nominate, with a more yellowish brown back, yellowish throat, and more yellowish olive underparts. A. s. venezuelana differs from the other subspecies in having a grayer crown, a browner back, more grayish brown breast and belly, rufous uppertail coverts, and a whitish throat. A. s. montana has a browner crown than the nominate, a darker and more rufescent back, a more chestnut tail, and more prominent streaks on the breast. A. s. yungae is more reddish overall than the nominate, with a darker, unstreaked crown. Both A. s. montana and A. s. yungae exhibit clinal variation. Each subspecies has a distinct distribution in northwestern South America: A. s. anxia is found in the Sierra Nevada de Santa Marta in northern Colombia; A. s. perijana occurs in the Serranía del Perijá on the Venezuela-Colombia border; A. s. venezuelana inhabits coastal and near-coastal mountains of north-central Venezuela; the nominate A. s. striaticollis lives in the Andes of western Venezuela and all three Andean ranges of Colombia; A. s. montana ranges along the eastern slope of the Andes from Colombia's Nariño Department south through eastern Ecuador into eastern Peru, as far as the Department of Junín; A. s. yungae is found along the eastern slope of the Andes from Peru's Department of Cuzco south into Bolivia as far as the Santa Cruz Department. The montane foliage-gleaner inhabits montane evergreen forest in the subtropical and foothill zones. Across most of its range it occurs at elevations between 900 and 2,300 m (3,000 and 7,500 ft), and it reaches up to 2,800 m (9,200 ft) in Colombia. In Ecuador its elevational range is narrower, spanning 1,000 to 1,800 m (3,300 to 5,900 ft), and in Peru it can occur as low as 750 m (2,500 ft).
