178 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



SCAPANEUS GUATEMALENSIS NELSONI Rixigway. 



NELSON'S IVOHY-BILL. 



Similar to S. g. guatemalensis but black of upper parts, neck, and 

 chest less sooty (that of foreneck glossy, slightly bluish), that of chest 

 more extended; back-stripes whiter (less yellowish); lighter bars on 

 under parts of body paler and narrower; yellow on under side of 

 wings paler; and average measurements decidedly smaller. 



Adult maZe.— Length (skins), 290-330 (304); wing, 165.5-187 

 (176.6); tail, 95-105.5 (98); culmen, 43-50 (45.1); tarsus, 31-33.5 

 (32.3); outer anterior toe, 19.5-25 (23.6).« 



Adult female.— Length (skins), 281-350 (307); wing, 174-189 

 (180.7); tail, 94.5-113 (103.8); culmen, 40.5-49 (44); tarsus, 30-33.5 

 (31.9); outer anterior toe, 20-24 (22.3).« 



Southwestern Mexico, in States of Sinaloa (Mazatlan; Presidio de 

 Mazatlan; Escuinapa; Brazil; Mt. Juan Lisiarraga, 5,500 ft.; Las 

 Cabras I.), Jalisco (Tonila; Baliia de Banderas), Colima (Rio de la 

 Armeria; Manzanillo; Santiago; Cualata; Jacolapa), Michoacan (La 

 Salada; Volcan de Jorulla), and Guerrero (Acapulco; Dos Arroyos; 

 El Zopilote; El Rincon; Tecpan; Papayo; La Saluda; Omilteme), 

 and Territory of Tepic (San Bias; Tepic). 



CampepMlus guatemalensis (not Picas guatemalensis Hartlaub) Lawrence, Mem. 



Bost. Soc. N. H., ii, 1874, 293 (Mazatlan, Sinaloa; Rio de la Armeria, 



Colima). 

 Campophilus guatemalensis Hargitt, Cat. Birds Brit. Mua., xvi, 1890, 473, part 



(Mazatlan and Presidio near Mazatlan, Sinaloa; Tepic; Tonila, Jalisco; 



Santiago, Cualata, and Jacolapa, Colima). — Salvin and Godman, Biol. 



Centr.-Am., Aves, ii, 1895, 446, part (localities in Sinaloa, Tepic, JaHsco, 



and Colima; Dos Arroyos, Guerrero). 

 C[am'pephilu^'\ guatemalensis Ridgway, Man. N. Am. Birds, 1887, 281, part. 

 CampepMlus guatemalensis gvntemalensis Miller (W. De W.), Bull. Am. Mus. 



N. H., xxi, Nov. 24, 1905, 352 (Escuinapa, Brazil, Las Cabras Islands, and 



Mt. Juan Lisiarraga, s. Sinaloa). 

 Scapanevs guatemalensis nelsoni Ridgway, Proc. Biol. Soc. Wash., xxiv, Feb. 24, 



1911, 34 (El Rincon, Guerrero; coll. U. S. Nat Mus.). 



SCAPANEUS GUATEMALENSIS REGIUS (Reichenbach). 



VERA CRTTZ IVORY-BILL. 



Similar to S. g. nelsoni but much larger (even than S. g. guatema- 

 lensis), and black of foreneck, chest, etc., rather less intense. 



Adult mak— Length (skins), 325-367 (353); wing, 183.5-205 

 (194.6); tail, 93.5-117.5 (106.6); culmen, 48-56.5 (51.8); tarsus, 

 33.5-38 (36); outer anterior toe, 25-30 (26.7).^ 



Adult female.— Length (skins), 318-384 (348); wing, 187-209 

 ■ (197.4); tail, 105-123.5 (113.9); culmen, 43-53 (49); tarsus, 34.5-37 

 (35.4); outer anterior toe, 23.5-27 (25.6).^ 



o Ten specimens. 6 Nine specimens. 



