LATHRIA. 129 
in the Tityrine ; 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 Cotingide, 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 Gymnoderine; 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 Chirocylla, Lathria, Aulia, and LInipaugus form a fairly 
natural group of allied genera. The structure of the feet, the form of the wings (if 
we except Chirocylla) and tail are similar in all of them; though there are minor 
points of difference which we mention under each genus. 
LATHRIA. 
Lathria, Swainson, Classif. B. i. p. 255 (1837) ; Scl. Cat. Birds Brit. Mus. xiv. p. 350. 
There are cight 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 unirufa 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. 
Lipaugus unirufus, Scl. P.Z. 8.1859, p. 8385"; 1861, p. 211°; Scl. & Salv. Ibis, 1860, p. 36°; 
P.Z.S. 1864, p. 8361‘; 1867, p. 279°; Ex. Orn. pp. 1, 6, t. 1°; Cass. Pr. Ac. Phil. 1860, 
p. 148°; 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. 8. 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 corneo, pedibus corylinis. Long. 
tota 9°5, ale 5°3, caude 4:5, rostri a rictu 1-0, tarsi 0°8. (Deser. exempl. ex Choctum, Guatemala. 
Mus. nostr.) 
@ mari similis. 
Hab. Mexico, Playa Vicente (Boucard+); Brivisq Honporas (Blancaneaux); Guate- 
MALA (Skinner), Coban1%, Choctum (0. 8. & F. D. G.); Nicaracua, Chontales 
(Belé 1), Los Sabalos (Nutting *), Blewfields (Wickham*); Panama, Bugaba !, 
Veraguas® (Arcé), Lion Hill (d*Leannan*), Chepo (Arcé), Turbo, R. Truando 
(C. J. Wood*).—Cotomsia }°. 
BIOL. CENTR.-AMER., Aves, Vol. II., February 1891. 17 
