508 NOTES ON THE GENUS SITTASOMUS — RlDGWAY. 



called *V. olivaceus from southwesteru Brazil (presumablj^ the same as 

 the one occurring in Bolivia and northern Argentina) is a still different 

 form, as is also the form inhabiting the upper Amazon Valley {8. ama- 

 zonus Lafr.). I have not been able to inspect auy example from any 

 part of Colombia, Venezuela, or Guiana, and can not, therefore, offer 

 an opinion as to the affinities of birds from the more northern parts of 

 South America. 



The forty-four specimens before me 1 find very easily separable into 

 six groups (some, perhaps, of only subspecific rank) by the following 

 characters:* 



a'. Throat not spotted. 

 6^ Pale band across inner webs of remiges very sharply defined, very distinct on 

 secondaries as well as primaries, and in color distinctly yellowish, 

 ci. Tail and secondaries cinnamon-chestnut. 



d\ Under parts olive-yellowish. Hab.: Brazil (Bahia, Rio Janeiro, Sapitiba,t 

 Ypanema,* etc.); "Paraguay ;" "Bolivia;" "N.Argentina." 



1. S. erithacus (Licht). 

 d^. Under parts grayish olive or olive-grayish. 

 e^. Back mixed rusty and olive. t 

 /'. More olivaceous, with much smaller bill ; under wing-coverts and 

 band across remiges deeper yellowish. Hab,: Interior of southern 

 Brazil (Cbapada, Matto-grosso) ; Paraguay ? Bolivia ? northern Argen- 

 tina? 2. S. chapadensis Ridgw. 



/-. More grayish, with much larger bill ; under wing-coverts and band 

 across remiges paler yellowish. Hab.: Upper Amazons. 



3. S. amazonus Lafr. 

 c^. Back uniform russet-brown, very different from color of top of head. 



Hab.: Costa Rica (and Veragua?) to southern Mexico. 



4. S. sylvioides Lafr. 

 c2. Tail and secondaries clear tawny. Hab. : Western Ecuador (Guayaquil, 



Babahoyo, Chimbo) 5. S. wquatorialis Ridgw. 



b" Pale band across inner web of remiges not sharply defined, very indistinct on 

 secondaries, and in color white, or yellowish white. Hab.: Tobago. 



Trinidad ? Venezuela ? G. S. (jriseus Jard. 



o'^ Throat spotted. Hab. : Upper Amazon 7. S. stictolwrnus, Pelz, 



The principal synonymy of these various forms is as follows : 

 1. Sittasomus erithacus (Licht.). 



Dendrocolaptcs erithacus TjICHT., Abh. Akad. Berl., 1820, 259, pi. 1. 



Sittasomus erytluicus Bonap., Cousp. i, 1850, 209. — Pelz., Orn. Bras. 1871, 59. 



Sittasomus erithacus Lafr., Rev. Zool. 1850, 5'^9. — ScL., Cat. B. Brit. Mus., xv, 

 1890, 119. 

 Sittasomus sylvkllus Temm., PL Col. livr. 12, Sept. 27, 1823, pi. 72, fig. 1. 

 Sittasomus olivaceus Max., Beitr. iii, 1830 (?), 114G. 



There can be no question that the type of S. olivaceus Max. belongs 

 to this species. Its coloration is a little modified by exposure to the 



* S. atictolamizis Pelz., being also included in the synoptical table to render it more 

 nearly complete. 

 \Fide Pelzeln, Orn. Bras., p. 59. 

 t The colors of the rump and top of head, respectively. 



