Stejneger, Standard Natural History, iv. 1885.
Sharpe, A Review of Recent Attempts to Classify Birds, 1891 (2nd Ornith. Congress).
Cat. Birds Brit. Mus. vi. 1881.
op. cit. vii. 1883, pp. xii-xvi.
Placed under the Timeliidae in Cat. Birds Brit. Mus. vii. 1883, p. ix.