460 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Prionites momotus (not Ramphastos viomota Liuneeus) Bonaparte, Proc. Zool. 



Soc. Lond., 1837, 114 (Guatemala; descr.). 

 Pr{ionites\ psalurus Bonaparte, Compt. Rend., xxxviii, 1854, 659, in text; Notes 



Orn. Coll. Dellattre, 1854, 88, in text; (Nicaragua; coll. Paris Mus.). 

 [Prionites] psalurus Bonaparte, Ateneo Italiano, ii, 1854, 317 (Consp. Volucr. 



Anisod., 1854, 8). — Heine and Reichenow, Nom. Mus. Hein. Orn., 1890, 156 



(Costa Rica). 

 Prionites psalurus Cabanis, Joiurn. ftir Orn., 1861, 255 (Costa Rica; crit.). 

 Momotus psalurus Sclater, Proc. Zool. Soc. Lond., 1857, 259 (monogr.). 

 Momotus subrufescens {not oi Sclater) Schlegel, Mus. Pays-Bas, iii, no. 19, 1863, 



3, part (Guatemala). — Sharpe, Cat. Birds Brit. Mus., xvii, 1892, 321, part 



(Mina de Chorcha, Panama) . 



MOMOTUS LESSONH EXIGUUS Ridgway. 



YUCATAN MOTMOT. 



Similar to M. I. lessonii but general color rather lighter and de- 

 cidedly greener, the hindneck always green (concolor with back, etc.), 

 and under parts with tawny wash (if present) confined to chest; 

 averaging decidedly smaller, especially the bill. 



Adult maZe.— Length (skins), 355-396 (384); wing, 126-132.5 

 (129.6); tail, 207-230 (215.1); exposed culmen, 36-41.5 (39.2); tarsus, 

 25-29 (27); middle toe, 17-18.5 (17.7.)« 



Adult female.— Length, (skins), 362-373 (367); wing, 127-131.5 

 (129.7); tail, 204-212 (207.3); exposed cuhnen, 38-39.5 (38.7); 

 tarsus, 27.5-29 (28.5); middle toe, 18.5-19.5 (19).^ 



Yucatan (Merida; Temax; Puerto Morelos; La Vega; Rio Lagartos; 

 Peto; Xbac; Buctzotz) and Campeche (Apazote). 



Momotus lessoni (not M. lessonii Lesson) Lawrence, Arm. Lye. N. Y., ix, 1869, 

 117, 204 (Merida, Yucatan).— Boucard, Proc. Zool. Soc. Lond., 1883, 453 

 (Yucatan; habits). — Sharpe, Cat. Birds Brit. Mus., xvii, 1892, 324, part 

 (Temax, Buctzotz, and Peto, Yucatan). — Salvin and Godman, Biol. Centr.- 

 Am., Aves, ii, 1895, 456, part (Temax, Buctzotz, Peto, and Merida, Yucatan). 



[Momotus] lessoni Sclater and Salvin, Nom. Av. Neotr., 1873, 102, part. — 

 Sharpe, Hand-list, ii, 1900, 77, part. 



Momotus lessonii Cole, Bull. Mus. Comp. Zool., 1, 1906, 146 (Xbac, Yucatan). 



Momotus lessonii exiguus Ridgway, Proc. Biol. Soc. Wash., xxv. May 4, 1912, 89 

 (Temax, Yucatan; coll. U. S. Nat. Mus.). 



MOMOTUS LESSONII GOLDMANI Nelson. 



GOLDMAN'S MOTMOT. 



Similar to M. I. exiguus, but averaging decidedly larger (the bill 

 conspicuously so), under parts still greener (more frequently devoid 

 of tawny wash on chest), and blue nuchal crescent with very little if 

 any (usually wholly without) violet-blue posterior margin. 



" Six specimens. b Three specimens. 



