LATHEIA. 129 



in the Tityrinse ; it is further defined as one of the " smaller forms ; bill turdine ; rictus 

 bristled ; bill broader, slightly hooked." Looking at the various genera comprised in 

 this second section of the Cotingidse, we doubt if these characters are sufficiently definite 

 for practical use. In the first place, there are species of Lathria considerably exceeding 

 in size Querula cruenta, a species of Gymnoderinse ; the bills of all this section are 

 very varied in form and cannot be satisfactorily classed as " turdine " in character. At 

 the same time it is obvious that Chirooylla, Lathria, Aulia, and Idpaugus form a fairly 

 natural group of allied genera. The structure of the feet, the form of the wings (if 

 we except CMrocylla) and tail are similar in all of them ; though there are minor 

 points of difiierence which we mention under each genus. 



LATHRIA. 



Lathria, Swainson, Classif. B. ii. p. 255 (1837) ; Scl. Cat. Birds Brit. Mus. xiv. p. 350. 



There are eight known species of this genus, which are distributed over Tropical America 

 from Southern Mexico to Bolivia and South Brazil. Only one species occurs within 

 our limits, which spreads from Southern Mexico to the northern portion of the United 

 States of Colombia. The bill in Lathria imirufa is stout, wide at the base, the culmen 

 arched, terminating in a distinct hook, with a well-defined subterminal notch on the 

 tomia of the maxilla ; the nostrils are nearly round, and placed at the end of the nasal 

 fossa, and are only partially covered by the supra-nasal plumes ; the rictal bristles are 

 moderately strong ; the tarsi are short and not rough beneath at their proximal ends ; 

 the outer toe is a little longer than the inner toe and is united to the middle toe as far 

 as the end of the first phalange ; the wings are rounded, the third and fourth primaries 

 being the longest (second < the fifth, first=the tenth) ; the tail is long and nearly even. 



1. Lathria unirufa. 



Upaugus unirufus, Scl. P.Z. S. 1859, p. 385'; 1861, p. 211'; Scl. & Salv. Ibis, 1860, p. 36'; 



P.Z.S. 1864, p. 361*; 1867, p. 279"; Ex. Om. pp. 1, 6, t. 1 °; Cass. Pr. Ac. Phil. 1860, 



p. 143 ' ; Lawr. Ann. Lye. N. Y. vii. p. 330 ' ; Salv. P. Z. S. 1867, p. 149 ' ; 1870, p. 199 " ; 



Ibis, 1872, p. 318"; Sumichrast, Mem. Bost. Soc. N. H. i. p. 558'". 

 Lathria unirufa, Scl. & Salv. P. Z. S. 1879, p. 518 " ; Nutting, Pr. U. S. Nat. Mus. vi. p. 404 " ; 



Scl. Cat. Birds Brit. Mus. xiv. p. 353 ''. 



Cinnamomea, subtus pallidior, remigibus intus brunnescentibus ; rostro comeo, pedibus corylinis. Long. 



tota 9-5, alse 5-3, caudse 4-5, rostri a rictu 1-0, tarsi 0-8. (Descr. exempl. ex Choctum, Guatemala. 



Mus. nostr.) 

 5 mari similis. 



Jffab. Mexico, Playa Vicente {Boucard ^) ; Beitish Hondukas {Blancaneaux) ; Guate- 

 mala (Skinner i), Cohan ^ ^, Choctuiid (0. S. & F. B. G.) ; Nicaragua, Chontales 

 {Belt 11), Los Sabalos {Nutting ^% Blewfields ( Wickham ^) ; Panama, Bugaba ^o, 

 Veraguas ^ (Arce), Lion Hill {M^Leannan *), Chepo (Arce), Turbo, R. Truando 

 {C. J. Wood 7).— Colombia i^. 

 BIOL. CENTE.-AMER., Aves, Vol. IL, February 1891. 17 



