40 BIEDS. 



Khh. Bill very slender, not strongly notched nor hooked ; 

 small, length 4 to 5. . . Sylviid^, 30. 

 gg. Tail shorter than wings ; general color olivaceous ; 

 bill stout, notched and hooked; length 4i to 6i. 



VrREONID^, 31. 

 ff. Bill not at all notched. 



i. Rictus with bristles ; quills not barred, the tail longer 



than wings ; large, length 9 or more. TuRDiDiS!, 18. 



a. No rictal bristles; wings and tail barred or undulated, 



usually about equal in length, the latter of rounded 



feathers; small, length 6 or less. 



Teoglodytid^, 24. 



in. No rictal bristles ; tail about as long as wings, scan- 



sorial, — its feathers rigid and acute, not barred; bill 



long, decurved ; length 5 to 6. . CBBTHiiDiB, 23. 



** Primaries 9 ; the first about as long as second. 



X Bill fissirostral, — triangular, depressed, about as wide at base 



as long; its wide, deep gape twice as long as the culmen, 



reaching to opposite the eyes; no rictal bristles; wings 



very long and pointed. . . . Hirundinid^, 39. 



XX Bill tanagrine, — stout, conic, its outlines convex, the tomia 



with one or more lobes or nicks near the middle ; nostrils 



very high ; plumage brilliant, chiefly red (i) or yellow (s). 



TANAGBlD-a!, 28. 



XXX Bill conirostral, — stout at base, and more or less conic; 



nostrils high up ; tomia more or less evidently angulated 



near the base (i. e., " corners of mouth drawn downward." ) 



j. Bill truly conic, much shorter than the head, usually 



notched at tip, or with bristles at the rictus. 



FRiN&rLLiD^, 33. 



jj. Bill conic, but lengthened more or less, about as long as 



head (except in DoUchonyx and Molothrus, the Bob-o- 



link and Cowbird) ; no notch at the tip or bristles at the 



rictus ICTBRiD^, 34. 



XtXX Bill not as above, with the tomia straight, or very gently 



curved. 



k. Conspicuously crested ; bill triangular, depressed, notched, 



and hooked; tail tipped with yellow; secondaries (in 



full plumage) with red, horny tips. . AMPELiDiB, 30. 



