1851. J 



183 



8. Nyetidromus gnia7i7tsis. (Gm.) 



Gmelin gives this name on the faith of the "Guiana Goatsucker" of Latham, 

 Gen. Syn. ii. pt. 11 p. 598, and " Le Montvoyau de la Guyana" of Buffon, Hist. 

 Nat. des Ois. vi. p. 549, figured in PI. Enl. 733 (which represents a young bird.) 



It is very similar to the preceding, but differs in size. 



The Prince de W ied, in Beit, zur Nat. von Bras. iii. p. 318, gives the most satis- 

 factory description extant of this bird. He says, hovi^ever, that it is the female 

 of C. albicollis, which name he cites accordingly as a synonyme. He is high 

 authority on the birds of Brazil, but as I am not aware that so great a difference 

 in the size of the sexes occurs in this difficult group, I have preferred, at present, 

 retaining it as a distinct species. 



9. Nyctidrormis grallaritis . (Bonaparte.) 



This appears to be a third species, of which there are several specimens in 

 the collection of this Academy. Bonaparte's description is not, however, suffi- 

 ciently explicit, and may possibly be intended for something else. 



10. Gemis Antrostomiis, " Gould." Bonap. Comp. List, p. 8. G. R. Gray, 

 List Gen., p. 9, " Gould, Icon. Av., 1838." Agassiz Nomen. Zool. Aves. 

 p. 6, " Gould" Nuttall Man. Orn. i. p. 739, (1840.) 



Obs I have not found the original description of this genus by Gould. It is not 

 contained in the copy o{ Icones Avium in the library of this Academy, and I sus- 

 pect that the only description is that by Nuttall in Man. Orn. 1 p. 739, (1840.) 

 I have seen the following species : 



1. Antroslomus carolinensis. (Gm.) And. B. of .Am. pi. 52. 



2. Antrostomiis rufns. (Gm.) Buff. PI. Enl. 735. 



3. Antrostomus serico-caudatns . Cassin, Jour. Acad. Philadelphia ii. pi. 12 

 (Quarto.) 



4. Antrostomus voclferus. (Wilson.) Am. Orn, v. p. 71, pi. 41. 



5. Antrostomus macro-mystax, Wagler, Isis 1S31, p. 533 (a species?) 



6. Antrostomus ocellatus. (Tschudi.) Fauna Peruana Aves. pi. 5, fig. 2. 



7. Ajitrogtomus Nuttallli. (And.) B. of Am. (Octavo) vii. p. 350 pi. 495. 

 The two latter species vary from the typical characters, and may be entitled to 



constitute a distinct genus. I have seen also one other small species, of which a 

 young specimen is in the collection of the Academy, and, is labelled as being 

 from Cayenne. I cannot identify it. 



11. Antrostovius carolinensis. (Gm.) 



In the genus Antrostomus, and in this species particularly, the bristles which 

 have their origin in the upper mandible reach their maximum. They exist how- 

 ever in greater or lesser degree of developement in all typical Caprimulgidm. 



In the present species these bristles are not only long and rigid, but each one 

 is ciliated, or, as Audubon expresses it," with lateral filaments." It is the only 

 species in which I have observed such formation. 



12. Antrostomtis rufus, (Gm.) 



This bird, named by Gmelin, (Syst. Nat. ii. p. 1030) on the faith of the descrip- 

 tion by Latham of " the rufous Goatsucker" (Gen. Syn. ii. pt. 2, p. 597) who 

 copies from Buffon's " Engouleverit roux de Cayenne" (Hist. Nat. des Ois. vi. p. 

 545) is another of the species which have been lost sight of. 



