238 [Oct. 



2. Ily.lrnpnalix seginnitnlut, nobis. 



5 riii(i(!lc age ? Form. Win'Jis moJerato, second prinnary sliijlitly longest, 

 secoml, third and fourth deeply sinuate<l on their outer webs; first with its outer 

 edge serrated, inner edges (of primaries) presenting a fringed appearance. Shafts 

 of primary (|iiills strong and curved. 



Tail very long, the two external feathers of which surpass the next by about 

 10 to V2 inches; second, third and iouith graduated; fourth and filth about e(iuiil 

 — that is to say, the four middle feathers of the tail nearly c(|iuil. 



Hill rather lon^ ami slender. Tarsi bare, slender. Webs of outer tail feathers 

 very narrow. 



Dimension 1. — Total length of skin from tip of bill to end of tail about 20 inches, 

 wing C>1, tail to end of external feathers about ioj inches; length of four middle 

 tail feathers about 4 inche«. 



Colore. — Upper surface of head, body, scapulars and wing coverts brownish- 

 black, spotted and obscurely lined Avith ferrugineous rufous, which color almost 

 predominates upon the scapulars. 



Neck, behind, with an obscure ferrugineous semi-collar, before, with a semi- 

 collar of rufous white. Body beneath, brownish black, with rounded ferrugineous 

 spots upon the breast, and uivdh the belly \vith obscure bands and spots of pale 

 ferrugineous and nearly wh.te. 



Wing feathers brownish-black; fir=t pritnary with a narrow pa'e reddish border 

 upon its outer web for about half its length, second and third with a nale ferru- 

 gineous spot at the point of sinuation. Secondaries with irregular bars of reddish 

 and with narrow tips of the same color. 



The two external feathers of the tail with their shafts white upon the upper 

 surface, outer webs white tinged with rufous, and handsomely marked (upon the 

 outer webs) with semicircular segments of black, having for their bases the shaft 

 of the leather. This marking is more conspicuous towards the base, and upon 

 the under surface the black color of these semicircular segments extends to the 

 shaft of the feather. Ail the other tail feathers brownish black, with bars of 

 f.MTUgineou=! rufous ; upon the two middle feathers these bars are mottled with black. 



Young 9 ? Form. Tail ample, emarginate, and regularly graduated, the two 

 external feathers being but little longer than the second. 



Dimehuoim. Total length of skin, from tip of bill to end of tail, about 9 

 inches; wing CI; tail, to end of external feathers, about /j inches; length of 

 middle feathers of tlie tail, about four inches. 



Colors. Entire plumage very similar to the male, but with all the tail feathers 

 brownish black, barred with ferrugineous. 



Hub. Bogota, New Grenada. 



Ob.i. The two specimens now described belong to the RivoU collection, and 

 have the appearance of being either young birds, or with the plumaie of winter. 

 The male mav, however, be easily recognized by the curious marks upon the 

 external webs of the outer tail feathers, described above. The colors in the 

 present specimens, black and ferrugineous, are peculiar to this species, so far as I 

 have seen. 



Genus Antrostomts. Gould. 



3. Antrostomns serico-caiidatii s , nobis. 



Adult 5 Vnrvt. Wings rather long, third primary lonsest ; second, third 



