GLAUCIDIUM. 33. 
Neotropical region, and is represented in Chili by a distinct species, another being found 
in Cuba. In Central America and Mexico four species occur, of which G. phalenoides 
is far the most abundant and widespread. As in many other genera of Owls, nearly 
all the species possess grey and rufous individuals, most of which at one time or 
another have had distinct names applied to them. These have now found their proper 
position, chiefly due to the studies of Dr. Sharpe and Mr. Ridgway. In the following 
arrangement we differ to a slight extent from both these authorities, but our 
conclusions being derived from the examination of a very extensive series of specimens 
seem amply justified. 
With the exception of the next genus, which is a slight modification of the present 
one, Glaucidium contains the smallest of the American Owls. With no ear-tufts and 
small ear-opening it belongs to the same section of the family as Speotyto, but differs 
in having much shorter tarsi, due doubtless to the arboreal life led by its members; 
the wings are more rounded, the first or outer primary being short. 
Of the four species of our country, G. phalenoides is found nearly everywhere ; 
G. gnoma belongs to Mexico, chietly the western part, and Guatemala; G. griseiceps, 
a local form of the South-American G. pumilum, is found in British Honduras, 
Guatemala, and Panama; and G. jardinii, of North-western South America, occurs in 
Costa Rica alone. 
A. Pileus striatus. 
1. Glaucidium phalenoides. 
Strix phalenoides, Daud. Traité, ii. p. 206°. 
Glaucidium phalenoides, Salv. P. Z. S. 1870, p. 217°; Ibis, 1889, p. 374°; 1890, p. 89*; Sharpe, 
Cat. Birds Brit. Mus. ii. p. 203°; Boucard, P. Z. 8. 1883, p. 456°; Ridgw. Pr. U.S. Nat. 
Mus. v. p. 5017; x. p. 593°; Ferrari-Perez, Pr. U. S. Nat. Mus. ix. p. 164°; Herrera, La 
Nat. (2) i. pp. 178, 321"; Zeledon, An. Mus. Nac. Costa Rica, 1887, p. 125"; Bendire, 
Auk, 1888, p. 366”; Life Hist. N. Am. Birds, i. p. 409, t.12. f£.17"; Stone, Pr. Ac. Phil. 
1890, p. 205 *; Cherrie, Auk, 1892, p. 827*°; Fisher, Bull. U. 8. Dep. Agr. no. 9, p. 199 an 
Athene infuscata (Temm.), Scl. P. Z. S. 1856, p. 285". 
Glaucidium infuscatum, Scl. & Salv. Ibis, 1859, p. 220°; Lawr. Ann. Lyc. N. Y. ix. p. 207 a 
Glaucidium ferrugineum, Lawr. Mem. Bost. Soc. N. H. ii. p. 297%; Bull. U.S. Nat. Mus. no. 4, 
p- 37”. 
Glaucidium jardinii, Scl. & Salv. Ibis, 1859, p. 220 (nec Bp.) ”. 
Glaucidium gnoma, Cab. J. f. Orn. 1862, p. 336”; v. Frantz. J.f. Orn. 1869, p. 336"; Lawr. Bull. 
U. S. Nat. Mus. no. 4, p. 37%; Sumichrast, La Nat. v. p. 237. 
Glaucidium infuscatum, var. gnoma, Ridgw. Pr. Bost. Soc. N. H. 1878, p. 63 *7; Lawr. Mem. Bost. 
Soc. N. H. ii. p. 298°. 
Glaucidium ridgwayi, Sharpe, Ibis, 1875, pp. 55”, 259"; Cat. Birds Brit. Mus. uu. p. 205"; 
Sumichrast, La Nat. v. p. 237”. 
Glaucidium, sp., Salv. P. Z. S. 1867, p. 158”. 
Supra griseo-umbrinum, interscapulio immaculato, uropygio rufescentiore, capite toto summo albo striato, 
BIOL. CENTR.-AMER., Aves, Vol. III., November 1897. 5 
