V °i8^ VI ] Oberholser on the Genus Contopus. 33 I 



the group to which, in a restricted sense, Contopus is now 

 applicable. 



Nuttallornis Ridgway. 



Nuttallornis Ridgway, Man. N. Amer. Birds, 1SS7, 337. 



Type, Tyrannus borealis Swainson. 



Chars, gen. — Resembling Horizopus, but tarsi shorter than middle 

 toe with claw ; wing exceeding tail by about one-half the length of latter ; 

 rictal bristles less developed (actually as well as comparatively shorter 

 than in Horizopus virens); first primary longer than the fourth. 



Geographic Distribution. — North America ; south in winter through 

 Central America and northwestern South America as far as Peru. 



Nuttallornis borealis (Swainson). 



Tyrannus borealis Swainson, Fauna Bor.-Am. II, 1831, 141, pi. 35. 

 Muscicapa inornata Nuttall, Man. N. Am. Birds, I, 1S32, 2S2. 

 Muscicapa cooperi Nuttall, Man. N. Am. Birds, I, 1832, 282. 

 Contopus mesoleucus Sclater, Proc. Zool. Soc. 1859, 43. 

 Geog. Dist. — The same as that of the genus. 



Horizopus, 1 nom. nov. 



Syrichta Bonaparte, Ann. Sci. Nat. ser. 4, Zool. I, 1854, 133 (nee 

 Syrichtus Boisduval). 



Contopus Cabanis, Journ. f. Orn. 1S55, 479 (nee Contipus de Marseul). 



Type, Muscicapa virens Linnaeus. 



Chars, gen. — Similar to Empidonax, but tarsi much shorter, wings 

 longer and much more pointed. 



Geographic Distribution. — North America, except the most northerly 

 portions; Mexico; Central America ; northern and western South Amer- 

 ica as far south as the Province of Tucuman, Argentine Republic. 



Horizopus pertinax (Cabanis). 



Contopus pertinax Cabanis, Mus. Hein. II, 1859, 72. 

 Geog. Dist. — Guatemala and southern Mexico. 



Horizopus pertinax pallidiventris (Chapman). 



Contopus fertinax pallidiventris Chapman, Auk, XIV, 1897, 311. 

 Geog. Dist. — Mountainous areas of northern Mexico, central and south- 

 ern Arizona. 



1 dpi£w, limito ; irovs, pes. 



