204 
Mr. P. L. Sclater on the Neotropical 
Leptonyx macropus. Sw. Zool. Ill. n. s. pi. 117 : D^Orb. 
Voy. Ois. p. 197. 
Hylactes megapodius, Gray, Gen. Birds, i. p. 154; Cab. et 
Hein. Mns. Hein. ii. p. 21; Scl. et Salv. Ex. Orn. p. 56, et 
Nomencl. p. 76. 
Supra fuscus, in uropygio rufescens : superciliis mento et guise 
lateribus albis : gula media cum pectore ferrugineo-rufis : 
abdomine albo, lateraliter et in crisso rufescente fusco 
transfasciato : long, tota 9*0, alse 3*7, caudse 2*9. Fem. 
mari similis. 
Hob. Chilia centralis et borealis {Darwin). 
Mus. P.L.S. 
u This bird is common in the dry country of Central and 
Northern Chili, where it replaces H. tarnii of the thickly 
wooded southern regions. The H. megapodius is called by 
the Chilenos “ el Turco.” [Darwin.) 
In general plumage the present species looks like a large 
edition of Pteroptochus albicollis. 
Genus 7. Acropternis. 
Acropternis, Cab. et Hein. Mus. Hein. ii. p. 20. 
This very remarkable type is readily known by the extra¬ 
ordinary flat oval shield into which the culmen is developed, 
and the long straight hind claw. Its ocellated plumage is 
likewise unique among the Passeres. 
1. Acropternis orthonyx. 
Merulaxis orthonyx, Lafr. Rev. Zool. 1843, p. 131; Mag. 
de Zool. 1844, Ois. pi. 93. 
Triptorhinus orthonyx, Cab. Wiegm. Arch. 1847, i. p. 220; 
Scl. P. Z. S. 1855, p. 142; Bp. Consp. p. 206. 
Pteroptochus orthonyx, Gray, Gen. Birds, i. p. 155. 
Acropternis orthonyx, Cab. et Hein. Mus. Hein. ii. p. 20; 
Scl. Cat. A. B. p. 169; Scl. et Salv. Nomencl. p. 77. 
Ommatornis orthonyx, Sclater, MS. 
Fuscescenti-niger, albo distincte guttatus: capite antico et 
laterali cum gula et collo toto necnon dorso postico sa¬ 
turate rubiginoso-rufis: remigibus et rectricibus fusco- 
nigris immaculatis: rostro et pedibus corneis; mandi- 
