202 
Mr. P. L. Sclater on the Neotropical 
Leptonyx alhicollis, D'Orb. Yoy. Ois. p. 196, pi. 8. f. 2. 
Suprk fuscus, uropygio et cauda extus rufescentibus; super- 
ciliis et gula cam pectore et ventre medio albis, his nigro 
transfasciatis : lateribus et ventre imo rufescentibus nigro 
transfasciatis : rostro et pedibns nigris : long, tota 7*8, 
alee 30, caudse 3*3. 
Hab. Chilia centralis [Darwin ). 
Mus. P. L. S. 
The “ Tapacolo ” as this species is called, replaces its con¬ 
gener in Central and Northern Chili. 
The pelvis and abnormal sternum of this bird are figured 
in Eytou’s f Osteologia/ pi. xiv. fig. 2 : there are also remarks 
on its osteology and soft parts by the same author in Zool. 
Yoy. Beagle, iii. p. 151. 
Genus 6. Hylactes. 
Hylactes, King, P. Z. S. 1830, p. 15 : type H. tarnii. 
Megalonyx, Lesson, Cent. Zool. p. 200 (1830) : type M. 
rufus (— H. megapodius ). 
Leptonyx , Sw. Zool. Ill. ser. 2, pi. 117 (1831-32): type H ’. 
megapodius. 
In general appearance Hylactes is a strong form of Ptero- 
ptochus , differing principally in its larger feet and elongated 
hind claw, and in possessing fourteen rectrices. It is likewise 
restricted to Chili. 
1. Hylactes tarnii. 
Hylactes tarnii, King, P. Z. S. 1830-31, p. 15; Cab. et Hein. 
Mus. Hein. ii. p. 21; Scl. et Salv. Ex. Orn. p. 58 ; Ibis, 1869, 
p. 283, et Nomencl. p. 76. 
Megalonyx ruficeps, Lafr. et D’Orb. Syn. Av. i. p. 16: 
D’Orb. Yoy. Ois. pi. 8. f. 1. 
Leptonyx tarnii, IP Orb. ibid. p. 198. 
Pteroptochus tarnii, Harw. Yoy. Beagle, Zool. iii. p. 70; 
Gray, Eaun. Chil. i. p. 304; Phil, et Landb. Cat. Av. Chil. 
p. 14. 
Obscure schistaceus: pileo summo, dorso postico et ventre cas- 
taneis, uropygii laterum et ventris imi plumis nigro trans¬ 
fasciatis : rostro et pedibus nigris: long, tota 9'3, alse 
4 0, caudse 3 5. Fem. mari similis. 
