. The structure and classification of birds . Fig. 111.—PowDJSB-DOWN Patches of Podargus (AriEK Sclatie). not absent (as Gaeeod asserted). Podargus is remarkablefor the possession oipowder-down patches, oi which there aretwo, one on either side of the rump (see fig. Ill), first dis-covered by Mr. Sclateb.^ The patches of this bird are welldefined and very compact, and have not the diffuse characterthat is seen in, for example, Bhinochetus. Powdfer downsare also found in Batrachostornus and Nyctibius. The SoLATEK, Notes upon the American Caprimulgidae, P. Z. S. 1866, p. 120.^ Additional Notes o
. The structure and classification of birds . Fig. 111.—PowDJSB-DOWN Patches of Podargus (AriEK Sclatie). not absent (as Gaeeod asserted). Podargus is remarkablefor the possession oipowder-down patches, oi which there aretwo, one on either side of the rump (see fig. Ill), first dis-covered by Mr. Sclateb.^ The patches of this bird are welldefined and very compact, and have not the diffuse characterthat is seen in, for example, Bhinochetus. Powdfer downsare also found in Batrachostornus and Nyctibius. The SoLATEK, Notes upon the American Caprimulgidae, P. Z. S. 1866, p. 120.^ Additional Notes on the Caprimulgidte, ibid. p. 581. CAPfllMULGI L33 pterylosis has been elaborately d,escribed by Gaeeod forSteatornis ; so we shall select that bird, though it is, as. Ph a > -Ah O a ■ : For notes on Steatornis see, in addition to papers quoted, N. Funck, Notice sur le Steatornis ca/ripensis, Bull. Ac. Belg. 1844, p. 371; F. Stolz-JTANN, Observations sur le Steatornis P^ruvien, Bull. Soc. ZtiOl. France,V. 1880, p. 198 ; Humboldt, Sur le Steatornis, Bull. Soc. Philom. 1817, p. 51; 234 STEUCTUEE AND CLASSIFICATION OF BIEDS already hinted, in many ways an aberrant form as a dorsal tract (see fig. 112) gradually narrows as itpasses down the neck, but the feathers get stronger; itbifurcates between the scapulae to form a well-definedfork, which ends ultimately, having become weaker. Betweenthis fork, and not connected with the rest of the dorsal tract,appears a spear-headed patch of feathers. The shaftof the spear becomes stronger as it descends to endabruptly at the base of the oil gland. The ventral tractis narrow between the mandibles ; it is undivided upon theneck. At the beginning of the breast it divides into a wideouter and a narrow
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
