TITYRA.—HADROSTOMUS. 12} 
also from the Amazons valley. Its range in altitude is also restricted to a lower level, 
which probably does not exceed 1500 feet, the approximate altitude of Choctum in 
Guatemala. 
Very little is recorded of its habits. Mr. Nutting!° says that it is common at La 
Palma in Costa Rica, and is usually found in rather open country associating in flocks. 
of six or eight, and that it is noisy and quarrelsome. 
HADROSTOMUS. 
Hadrostomus, Cabanis & Heine, Mus. Hein. ii, p. 84 (1859); Scl. Cat. Birds Brit. Mus. xiv. p. 333.. 
Five species are included in the genus Hadrostomus, which range from Northern 
Mexico to Southern Brazil, one species, H. aglaiw, even passing beyond these limits. 
into Southern Arizona. 
Two species only are found within our borders, the widely spread and variable 
H. aglaie and H. homochrous, and these appear to be not very definitely separable. 
Though very similar in structure to Pachyrhamphus, with which it was long united, 
Hadrostomus is a fairly natural genus, being composed of birds of larger size and 
stouter build. The bill is larger in proportion, and the colours of the plumage more 
uniform and devoid of definite pattern. ‘The males are grey or blackish, the females 
more or less rufous. 
1. Hadrostomus aglaiz. 
Pachyrhynchus aglaie, “afr. Rev. Zool. 1839, p. 98°. 
Psaris aglaie, Kaup, P. Z. 8. 1851, p. 46°. 
Pachyrhamphus aglaie, Scl. P. Z. 8S. 1856, p. 297°; Scl. & Salv. Ibis, 1859, p. 124*; Owen, Ibis, 
1861, p. 64°. 
Platypsaris aglaie, Scl. P. Z. 8S. 1859, p. 285°; Sumichrast, Mem. Bost. Soc. N. H. i. p. 5587; 
Ridgw. Man. N. Am. B. p. 240°. 
Hadrostomus aglaie, Cab. & Heine, Mus. Hein. i. p. 85°; Cab. J. f. Orn. 1861, p. 252°; Sel. 
P. Z. 8. 1864, p. 176"; Cat. Birds Brit. Mus. xiv. p. 885”; Lawr. Ann. Lyc. N. Y. ix. 
pp. 116%, 204"; Bull. U. S. Nat. Mus. no. 4. p. 28”; Frantz. J. f. Orn. 1869, p. 309"; 
Scl. & Salv. P. Z. S. 1870, p. 837°"; Grays. Pr. Bost. Soc. N. H. xiv. p. 279"; Ferrari- 
Perez, Pr. U. S. Nat. Mus. ix. p. 156. 
Platypsaris affinis, Elliot, Ibis, 1859, p. 394°; Scl. P. Z. 8. 1859, p. 866”; Sumichrast, Mem. 
Bost. Soc. N. H.1. p. 558”. 
Hadrostomus aglaie, var. affinis, Lawr. Mem. Bost. Soc. N. H. ii. p. 289”. 
Pachyrhamphus latirostris, Bp. Compt. Rend. xxxviii. p. 658%; Not. Orn. p. 87”; Scl. P. Z.S. 
1857, p. 74°. 
Hadrostomus latirostris, Nutting, Pr. U. S. Nat. Mus. vi. p. 3937". 
Platypsaris latirostris, Ridgw. Man. N. Am. B. p. 240”. 
Hadrostomus albiventris, Lawr. Mem. Bost. Soc. N. H. ii. p. 289”; Scl. Cat. Birds Brit. Mus. xiv. 
p. 335”. 
BIOL. CENTR.-AMER., Aves, Vol. IT., December 1890. 16 
