Bulletin - United States National Museum - si-pddr - Smithsonian ...

BIRDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 397
In the extensive areas of diy scrub that covered the low hills near
Tapia, Tuciiman, the present form was common from April 6 to 13,
1921. An adult bird, probably a female, in molt was taken April 6,
and an immature male in process of change to the post-juvenal
plumage on April 7. Males sang occasionally during this period, in
spite of their ragged feathers.
Measurements, in millimeters, of these specimens are appended in
the following table. It may be noted that the rectrices in this species
often indicate considerable abrasion so that their measurement is
variable.
Museum
No.