Family Tyrant-flycatchers (Tyrannidae)

Least Concern

White-rumped Sirystes (Sirystes albocinereus)


Taxonomy

French: Tyran à croupion blanc German: Halsband-Kappentyrann Spanish: Mosquero culiblanco
Taxonomy:

Syristes [sic] albocinereus

P. L. Sclater and Salvin

, 1880,

upper Amazon, Sarayacu (Ecuador), Colombia = “Bogotá”, Colombia

.

Until recently considered conspecific with S. sibilator, S. albogriseus and S. subcanescens, but detailed review#R (supplying data on which effect sizes calculated) indicates that present form differs from S. albogriseus in characters given under that species; differs from S. subcanescens in more white on rump (2); paler throat and breast (1); shorter whistle call (effect size −3.51; score 2) and chattering song with lower maximum frequency (effect size again −3.51; score 2); and from S. sibilator in much more white on rump (3); less dorsal striation (1); less white on wing-coverts (1); longer whistle call (effect size 3.4; score 2) and chattering song with lower maximum frequency (effect size −1.42; score 1). Monotypic.

What do (1) and (2) mean? Learn more about the scoring system.
Distribution:

SW Venezuela (SE Portuguesa to SE Táchira), E Colombia (locally to near base of Andes from W Arauca to Putumayo), E Ecuador, E Peru, W Brazil (SW Amazonas, Acre) and N Bolivia (S to La Paz, Cochabamba and N Santa Cruz).

Descriptive notes

18–19 cm; 24–32 g. Myiarchus-like tyrant-flycatcher. Crown black, becoming slate-grey on head-sides, contrasting with mottled grey back, large white rump patch,... read more

Voice

Song comprises a mellow series of whistles, e.g. “p’weer PEW-pu”, while calls include a longer but... read more

Habitat

Canopy and borders of humid forest, including dry and semi-deciduous forest in N Bolivia; below 550... read more

Food and feeding

Almost nothing known, but diet is perhaps dominated by large arthropods; like others of S. sibilator superspecies is usually... read more

Breeding

Active nest thought to contain well-grown nestlings in early Oct in SE Peru (Madre de Dios); nest was in cavity estimated to be 32 m above... read more

Movements

Resident.

Status and conservation

Not globally threatened (Least Concern). Very uncommon and local in E Colombia and in E Ecuador, but it was reported as common at Limoncocha in the latter country, near... read more

Recommended citation

del Hoyo, J., Collar, N. & Kirwan, G.M. (2019). White-rumped Sirystes (Sirystes albocinereus). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/1343710 on 27 June 2019).