364 University of California Publications in Zoology I Vol. 13 



quill being a short distance distad of this point ; ventral groove 

 practically absent; striations on sides at junction of barbs distinct. 

 Pith of ramus only one cell in thickness, the ventral ridge rela- 

 tively wide, its ventral edge smooth in barbs of both vanes. Vanules 

 rather open, the barbules set about 28 per millimeter on both distal 

 and proximal ones, although both are composed of rather narrow 

 barbules. 



Inner vane. — Distal harhules (pi. 30, fig. 72a.) with relatively 

 very long and narrow base, about 0.28 by 0.035 mm., the ventral 

 contour sinuate, i. e., broad on proximal half, then becoming nar- 

 rower in an even curve just proximal to the ventral teeth, which 

 curve slightly outward again ; flange very well developed ; ventral 

 teeth very small and slender. Penuulum a little shorter than base, 

 all its cells, including those bearing booklets, not short or crowded 

 together; the booklets, about 5 in number, small, very frequently 

 with prongs as in Columbae, and hanging straight ventrally, i. e., 

 not curved forward as when booklet cells are crowded; ventral 

 cilia short and appressed to pennulum, the dorsal cilia more promi- 

 nent, proximal two large and lobate, more distal ones short and 

 spinelike. Proximal barbules (pi. 30, fig. 72b) short and slender 

 relative to distals; base about 0.4 by 0.035 mm., ventral teeth short, 

 blunt, inconspicuous, pennulum somewhat shorter than base and 

 rather stout, sometimes with minute, rudimentary barbicels. 



Outer Vane.— Distal barbules (pi. 30, fig. 72c) with shorter 

 and relatively broader and less sinuate base than those of inner 

 vane ; booklets 5 or 6 in number, cilia as in distal barbules of inner 

 vane except absence of proximal dorsal ones. Proximal barbules 

 on basal half or more of barbs like those of inner vane, on more 

 distal part with a well-developed series of rather short cilia, middle 

 ones of which are hooked (pi. 30, fig. 12d). 



(2) other Feathers 



Back feathers with distal barbules much like those of outer 

 vane of remex except that their bases are much more slender, 

 about 0.28 by 0.025 mm., the booklets usually 4 in number, small, 

 but progressively increasing in length more than in remex, and 

 frequently with prongs; cilia small. Proximal barbules even more 

 slender than in remex, the base about 0.4 by 0.28 mm. Ventral 

 teeth 2 or 3 in number, very inconspicuous, pennulum shorter than 

 base. 



Breast feathers almost exactly same as back feathers in struc- 

 ture, but barbules weaker and still more slender (pi. 30, figs. 

 72e, /). 



b) Other Types 



The structure of the feathers of all the Cuculidae are very sim- 

 ilar to the type described as far as examined {Coccyzus, Cuculus, 

 Geococcy^ and Eudynamis), except where there are modifications 

 for color production. 



The Musophagidae do not differ in any important ways from the 



