634 MESSRS. SCLATER AND SALVIN ON [ Dec. 9, 
20. Potysorvus THARUS (Mol.). 
P. vulgaris, Burm. 1. ¢. p. 434. 
Three examples. 
21. URuBITINGA MERIDIONALIs (Lath.). 
Three examples. 
22. BuTEo aLpicaupatTus, Vieill., ex Azara, no. 10. 
B. pterocles, Temm. 
A young bird, probably referable to this species. 
23. ASTURINA PUCHERANTI, Verr.; Scl. et Salv, Ex. Orn. p. 177, 
t. 86. 
Four skins, none of them quite mature. 
24. Orus AMERICANUS (Gm.). 
Nacurutu chorreado, Azara, Apunt. 1. p. 202. 
O. mexicanus, Hart]. Ind. Az. p. 3. 
One skin of this Owl. 
25. PoreHyriops MELANOPS (Vieill.). 
Two skins of this bird. In our synopsis of Rallidee (P. Z.S. 1868, 
p- 461) we have admitted with doubt two species of Porphyriops, 
observing that we could not consider them established until we had 
had an opportunity of examining further specimens. We have now 
before us five examples of this bird from New Granada, Chili, and 
Paraguay, but cannot satisfy ourselves that there are grounds for 
making two species of them. The white edgings of the external 
secondaries vary in extent, being best shown in one of the Bogota 
specimens, but apparently depend more upon age and sex than upon 
locality. We are of opinion therefore that there is but one valid 
species of this genus, which must be called P. melanops (Vieill.). 
26. Ruyncuoprs nieGRA (Linn.) ; Burm. doe. pe 220, 
One skin. 
27. Arpga coco}, Linn. ; Burm. l. c. p. 508. 
One skin. 
28. ARDEA SIBILATRIX (Temm.); Pl. Col. 271. 
Flauta del Sol, Azara, Apunt. iii. p. 169. 
Two examples, marked “very rare, eye white,” Not mentioned 
by Burmeister. 
29. ARDETTA INvoLUCRIS (Vieill.). 
Garea varia, Azara, Apunt. iil. p. 185. 
Ardea involucris, Vieill. N. D. xiv. p. 424, et E. M. p. 1127. 
Ardevla erythromelas, jv., Bp. Cousp. ii. p. 135, et al. auct. 
Mr. Hudson sends-two examples of a Little Bittern, which is cer- 
