90 Ridgway — New Species of Birds from Tropical America. 



purer (less yellowish) green; bill relatively broader and more strongly 

 arched. 



Measurements of type. — Wing, 110; tail, 180; exposed culmen, 37; 

 tarsus, 17 ; middle toe, 14. 



Eumomota superciliaris bipartitus subsp. nov. 



Type from Cacoprieto, Oaxaca. No. 145,282, coll. U. S. Nat. Mus. 

 Adult male. February, 1880. Collected by Prof. A. Sumicbrast. 



Similar to E. s. superciliaris, from Yucatan, Campeche, and eastern 

 Tabasco, but with under parts of body divided into two very sharply 

 defined differently colored areas, the breast uniform olive-greenish, the 

 remaining portion uniform cinnamon-rufous; cinnamon-rufous inter- 

 scapular area usually either much larger or better denned. 



Measurements of tape — Wing, 1I4..">; tail, 210; exposed culmen, 41 ; 

 tarsus, 22; middle toe, 17. o. 



Antrostomus nelsoni sp. nov. 



Type from Chichen-Itza, Yucatan. No. 40,0!)."., coll. Mus. Comp. Zool. 

 Adult male. March 29, 1904. Collected by L. J. Cole. 



Resembling A. salvini Hartert in size and general coloration, but 

 differing conspicuously in the much greater extent and different pattern 

 of the white terminal areas to lateral rectriees, which extend farther from 

 the tip on inner webs than on the outer; in the broad and conspicuous 

 unbroken collar of tawny-ochraceous across hindneck, and immaculate, 

 instead of barred, under tail-coverts. 



Measurements of type. — Wing, 177; tail, 128; exposed culmen, 13.5; 

 tarsus, 17.5; middle tor, 17. 



This is the bird which Mr. Nelson, in describing his A. notabilis (from 

 Tamaulipas), considered to be the J. salvini of Hartert; but since the 

 latter was based exclusively and explicitly on the A. macromystax (not 

 Caprimulgus macromystax Wagler) of Baird, Brewer, and Ridgway, 

 which is the same as .1. notabilis, it is very obvious that Mr. Nelson 

 made an error in the case, the exceeding poor colored figure in the 

 ' Biologia Centrali-Americana " having misled him. 



It is barely possible that A. nelsoni may prove to be the male of A. 

 badius Bangs from British Honduras, hut the general coloration of the 

 latter is very much more rufescent and the two are just as likely to prove 

 quite distinct. Unfortunately the type and only known specimen of 

 A. badius is a female (though erroneously determined as male), so that 

 we are a.s yet ignorant as to the color-pattern of the tail in the male of 

 that form. 



Nyctidromus albicollis nelsoni subsp. nov. 



Type from city of Colima, Colima, southwestern Mexico. No. 154,746, 

 coll. I*. S. Nat. Mus. (Biological Survey coll.). Adult male; March 26, 

 L892; collected by E. W. Nelson. 



