Black-capped Antwren

herpsilochmus atricapillus

Thamnophilidae · Antbirds, Antwrens

Disc 2 · 2001 listed
Disc 3 · 2006 listed
Disc 1 · 2011 listed

The account

Description

12 cm. Male has a black crown, a long pronounced white superciliary stripe and a black eye-stripe. Back slate-gray. Wings black with 2 white wingbars, the wing coverts with white spots. Below whitish-grey. Tail long, black, the feathers with white tips.

Female has a cream-colored forehead and a dark crown streaked with white. Olivaceous back. Beige belly.

Male Disc 3 · 2006
Female Disc 3 · 2006

Each plate is labelled with the disc's own caption.

Where it was recorded

The discs' own checklists select Black-capped Antwren at 2 localities.

Historical checklist localities on the disc's own area map — the red dots the original program drew, placed by its recovered projection. Not a range map: it shows the places whose checklists record the bird, nothing more.

Reserva Ecológica Guapiacú RERB
Vassununga VASB

How the map was made

The original program computed each red dot at display time from the locality's coordinates, using its map library and one of five base maps drawn for the screen widths of the day. That library's projection — an oblique rotation of the sphere about the map's own centre, 23.7°S 47.4°W — was read from the program and checked against the graticule the same program drew into the base maps: it reproduces every grid intersection to within about a pixel. The dots here use that projection on the 1280-pixel base map, with the coordinates the discs record. Nothing was placed by hand, no modern map data was used, and a place whose coordinate is incomplete, out of range or beyond the map's edge is listed rather than guessed.

The discs carried location maps only; none shows a distribution or range.

Voice

Song a fast descending trill 'ti tirrrrrrrrrrrrrtititititip' and an ascending fast sequence of four whistles 'wo wu wa wi' (cut #5).

Behavior

Forages in the canopy by gleaning leaves. Frequently in small groups.

Habitat and status

Widespread in the interior of Brazil. In the canopy of tall, dry forest.

Distribution

Extralimital, recorded within the Estado São Paulo in the far north from Bebedouro, Porto Tibiriçá and Itapura (⁴⁰). I saw them in the Serra das Rosas near Franca. Possibly present closer to the shore in suitable habitat.

Decoded from the disc's own bytes. Each part is shown under the heading the disc files it under, and the wording, spelling and punctuation are the author's.

Vocalizations

Song. Serra das Rosas near Franca. 11/7/98. Rain in the morning, then sunny, 27°C. Secondary forest. With Basileuterus flaveolus, Philydor rufus, Cariama cristata.
Song, Serra das Rosas, 11/8/98. Sunny, 25°C. Dry forest.
Song. Vassununga, São Paulo. 11/12/98. Sunny, 27°C. Secondary forest. With Leptotila verreauxi.
Song. Pirapora, MG. 11/13/98. Sunny, 30°C. Scrub, gallery forest. With Pachyramphus viridis.
Call, Serra das Rosas, near Franca, 11/7/98, rain in the morning then sunny, 27°C. Secondary forest. With Hylophilus amaurocephalus call, Vireo olivaceus.

Recording files on the disc

13764.mp3 Song. Serra das Rosas near Franca. 11/7/98. Rain in the morning, then sunny, 27°C. Secondary forest. With Basileuterus flaveolus, Philydor rufus, Cariama cristata.
493.wav Song, Serra das Rosas, 11/8/98. Sunny, 25°C. Dry forest.
1537.mp3 Song. Vassununga, São Paulo. 11/12/98. Sunny, 27°C. Secondary forest. With Leptotila verreauxi.
8630.mp3 Song. Pirapora, MG. 11/13/98. Sunny, 30°C. Scrub, gallery forest. With Pachyramphus viridis.
8421.mp3 Call, Serra das Rosas, near Franca, 11/7/98, rain in the morning then sunny, 27°C. Secondary forest. With Hylophilus amaurocephalus call, Vireo olivaceus.

Across the three discs

The work was published on three discs — Disc 2 in 2001, Disc 3 in 2006 and Disc 1 in 2011. Where they differ, that is a difference between historical releases, and it is never merged away. The 2011 disc is not treated as correcting the earlier ones.

Which discs list this bird

Disc 2 · 2001 — in this disc's bird list
Disc 3 · 2006 — in this disc's bird list
Disc 1 · 2011 — in this disc's bird list

How that was established

Disc 2 · 2001: aux_nonzero;local_checklist_byte45_flag_1
Disc 3 · 2006: aux_nonzero;local_checklist_byte45_flag_1
Disc 1 · 2011: aux_nonzero;local_checklist_byte45_flag_1

The disc's own record fields that place the bird on its list: a non-empty entry in the species table, and the byte that marks it as selected on a local checklist.

The account in the Disc 1 · 2011 revision

The 2011 Disc 1 revision carries this account text unchanged from the Disc 3 release.

The work's own taxonomy

The discs carried three parallel name schemes. All three are shown as recovered; none is a modern taxonomy and none has been updated.

Scheme	Scientific name	English name	Family
WORLD	herpsilochmus atricapillus	Black-capped Antwren	Thamnophilidae
CLEMENTS	herpsilochmus atricapillus	Black-capped Antwren	Thamnophilidae
AOU_HM	herpsilochmus atricapillus	Black-capped Antwren	Thamnophilidae

Source details

Identifier on this site: seb_species_0129
Account identifier: seb_account_0129
Account number on the disc: 129
Source edition: CD03 / 2006 package
Original taxonomy scheme: WORLD
Structure status: heuristic; decoded_account_text and segment JSON remain authoritative