BIRDS OF NORTH AND MIDDLE AMERICA. 373 



dd. Tail relatively shorter, more strongly graduated, bicolored (with a black 

 subterminal band); under parts white, striped with black. 



Micromonacha (extralimital).a 

 cc. Feathers of malar region not elongated; tail less strongly rounded, the lateral 

 rectrices decidedly more than three-fourths as long as middle pair; colora- 

 tion plain (neither streaked nor spotted). 

 d. Bill stouter, less compressed, its width at nostrils equal to nearly half the 

 distance from nostril to tip of maxilla, black; antrorse bristles around base 

 of bill much larger, covering more than Isasal half of bill; above olive, 



beneath tawny, the throat white Hapaloptila (extralimital) . & 



dd. Bill more slender, more compressed, its width at nostrils much less than 

 half the distance from nostril to tip of maxilla, red, orange, or yellow; 

 bristles around base of bill smaller, covering much less than basal half of 

 bill; above not olive and beneath not tawny, or else (Nonnula) throat 

 not white. 

 e. Tail nearly as long as wing; bill not strongly decurved from middle; upper 

 tail-coverts not white. 

 /. Bill stouter, its depth at nostrils equal to nearly half the distance from 

 nostril to tip of maxilla, the length of exposed culmen very much less 

 than one-third the length of wing; tail rounded, the difference between 

 middle and lateral rectrices less than one-sixth its length, the rectrices 

 relatively much broader; coloration black or black and grayish, some- 

 times with white on wing-coverts or fore part of head, the bill red, 

 orange, or yellow; very large (length more than 225 mm.). 



Monasa (p. 392). 

 ff. Bill more slender, its depth at nostrils equal to much less than half the 

 distance from nostril to tip of maxilla, the length of exposed culmen 

 equal to much more than one-third the length of wing; tail graduated 

 for nearly one-third its length, the rectrices relatively much narrower; 

 coloration jlain brown or olive above, tawny-ochraceous or fulvous 

 beneath, the under tail-coverts usually white; very small (length 



less than 150 mm.) Nonnula (p. 399). 



ee. Tail only about half as long as wing; bill strongly decurved for terminal 

 half or more; upper tail-coverts (lower also) white. 



Chelidoptera (extralimital) .« 



Genus NOTHARCHUS Cabanis and Heine. 



Notharchus <i Cabanis and Heine, Mus. Hein., iv, heft 1, Jan. 15, 1863, 146 

 (footnote), 149. (Type, Tamatia hi/perrhynchus JionaT[)a.rte.) 



« Micromonacha Sclater, Proc. Zool. Soc. Lond., Oct., 1881, 777. (Type, Bucco 

 lanceolatus Deville.) 



Upper Amazon Valley. (Monotypic.) 



I have not seen this form, and therefore can not give its generic characters with 

 greater exactness. 



6 Hapaloptila Sclater, Proc. Zool. Soc. Lond., 1881, 777. (Type, Malacoptila 

 castanea Verreaux.) 



Colombia to Ecuador. (Monotypic.) 



c Chelidoptera Gould, Proc. Zool. Soc. Lond., 1836, 81. (Type, Cuculus tenebrosus 

 TaLllas.)—Brachypetes Swainson, Classif. Birds, ii, 1837, 334, fig. 290c. (Type, Cuculus 

 tenebrosus Pallas.) 



Guiana and Venezuela to southeastern Brazil. (Two species.) 



<i "vu)^r}c (triige) und apxoc (Herrscher)." (Cabanis and Heine.) 



