HYDROPSALIS AND ANTROSTOMUS. 117 



Ohs. — A fine species, with the tail excessively developed, first described in 

 Conspectus Avium by the distinguished naturalist above named. The type of his 

 description is now in the collection of this Academy, and also a young bird, which has 

 recently very fortunately been added to the collection. 



This species has not been figured. 



4. Hydropsalis segmentatus. Cassin, Proc. Acad. Philada. iv. p. 238. (Oct., 1849.) 



PI. 13. (Section of tail feathers.) 



Form. — 5 scarcely adult. Wings moderate, second primary slightly longest, 

 first with its outer edge serrated ; all the primaries with their inner edges presenting 

 a diffused or fringed character. Tail very long, two external feathers much the 

 longest, second, third and fourth graduated, fourth and fifth about equal — that is to 

 say, the four middle feathers of the tail nearly equal. Bill rather unusually long 

 and slender ; webs of outer tail feathers very narrow. 



Dimensions. — Total length of skin from tip of bill to end of tail about 20 inches ; 

 wing 6| ; tail to end of external feathers about 15| inches ; length of four middle tail 

 feathers about 4 inches. 



Colors. — Upper surface of head, body, scapulars and wing coverts brownish black, 

 spotted and obscurely lined with ferruginous rufous, which color almost predominates 

 on the scapulars. Neck behind with an obscure ferruginous semicollar, before with 

 a semicollar of nearly white. 



Body beneath brownish black, with rounded ferruginous spots on the breast and 

 on the belly, with obscure bands and spots of pale ferruginous and nearly white. 



Quills brownish black, first primary with a narrow, pale reddish border on its 

 outer web for about half its length, second and third with a pale ferruginous spot at 

 the point where sinuated on their outer edges. Secondaries with irregular bars of 

 reddish and with narrow tips of the same color. 



Two external feathers of the tail with their shafts white above, outer webs white, 

 tinged with rufous and marked (on the outer webs) with a row of semicircular 

 segments of black, having for their bases the shaft of the feather. This marking is 

 more conspicuous towards the base, and on the under surface the black color of these 

 semicircular segments extends to the shaft of the feather. Other tail feathers brownish 

 black, with bars of rufous ; on the two middle feathers these bars are mottled with 

 black. 



9 young? Tail ample, deeply emarginate, but with the two external feathers 

 little longer than the second. Total length of skin from tip of bill to end of tail 

 about 9 inches; wing 6^ ; tail to end of external feathers 5 inches. 



Entire plumage very similar to that of the male, (as above,) but with all tlie tail 

 feathers brownish black, barred with ferruginous. 



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