BIRDS OF NORTH AND MIDDLE AMERICA. 583 
Immature male.—Similar to the adult female but upper parts more 
bronzy (intermixed with coppery feathers in older specimens); tail 
as in adult male; median under parts coppery purple (more or less 
extensively). 
Caribbean slope of Costa Rica (Angostura; Tucurriqui; Turrialba; 
Bonilla; Carrillo; Rio Sicio; Puerto Limén; La Balsa; La Vijagua) 
and Nicaragua (Chontales; Matagalpa). 
Panychlora parvirosiris LAWRENCE, Proc. Ac. Nat. Sci. Philad., 1865, 39 (Angos- 
tura, Costa Rica; coll. U. §. Nat. Mus.). 
Microchera parvirostris Savin, Proc. Zool. Soc. Lond., 1867, 154, in text (Tucur- 
riqui, Costa Rica; crit.); Ibis, 1872, 313, 319 (Chontales, Nicaragua; crit.); 
1892, 327 (Matagalpa, Nicaragua); Cat. Birds Brit. Mus., xvi, 1892, 67, 656 
(La Balsa, Costa Rica, etc.)—Lawrence, Ann. Lyc. N. Y., ix, 1868, 122 
(Angostura, Costa Rica; descr. adult male).—Franrzius, Journ. fiir Om., 
1869, 315 (Costa Rica).—Muusant and Verreaux, Hist. Nat. Ois.-Mouch., 
iii, livr. 2, 1876, 136.—Boucarp, Proc. Zool. Soc. Lond., 1878, 69 (Costa 
Rica); Gen. Hum. Bird, 1892, 51 (Chontales, Nicaragua; Limén, Costa 
Rica).—Exiiot, Classif. and Synop. Troch., 1879, 104.—Gouxp, Suppl. 
Troch., 1880, pl. 30.—ZzLED6N, Cat. Aves de Costa Rica, 1882, 20; Anal. 
Mus. Nac. Costa Rica, i, 1887, 121 (Rio Sticio, Costa Rica).—Rimeway, Proc. 
U. 8. Nat. Mus., vi, 1884, 415 (Rio Sticio, Costa Rica); Condor, vii, 1905, 
157, in text (Bonilla, Costa Rica).—Satvin and Gopman, Biol. Centr.-Am., 
Aves, ii, 1892, 269.—Carriker, Ann. Carnegie’Mus., vi, 1910, 551 (Carib- 
bean slope of Costa Rica, 1,000-3,000 ft.; descr. nest). 
[Microchera] parvirostris Scuarer and Satvin, Nom. Av. Neotr., 1873, 83.— 
Mutusant, Ann. Soc. Linn. Lyon, n. 3., xxii, 1876, 221.—SHarrr, Hand- 
list, ii, 1900, 143. 
M{tcrochera] parvirostris HartEert, Das Tierreich, Troch., 1900, 216 (monogr.), 
[Topaza] parvirostris Gray, Hand-list, i, 1869, 134, no. 1725. 
Genus MELLISUGA Brisson. 
Mellisuga Brisson, Orn., ili, 1760, 694. (Type, Trochilus minimus Linnzus.) 
Dyrinia Mutsant and VerrEaux, Mém. Soc. Imp. Sci. Nat. Cherb., xii (sér. 2, 
ii), 1866, 232 (Classif. Troch., 1866, 88). (Type, Trochilus minimus Linnzeus.) 
Very small Trochilide (length about 55-60 mm.*) with bill shorter 
than head, straight, wing more than three times as long as exposed 
culmen, tail about half as long as wing, emarginate in adult male, 
rounded in female and young, the adult male without brilliant coloring 
on throat, which is dull whitish or grayish in both sexes. 
Bill shorter than head, straight, relatively rather stout, broader 
than deep basally; culmen rounded except basally, where contracted 
into a rather distinct ridge; tomia smooth; mandible with the usual 
lateral median groove. Nasal operculum rather broad, convex, 
and tumid, nude, but hidden by appressed frontal feathering, which 
anteriorly extends about as far as anterior end of nostrils, forming 
a short obtuse point or antia on each side of culmen. Tarsus feath- 
ered, except on posterior side; lateral toes about equal in length, 
@ With a single exception (Calypte helenx) the smallest of birds. 
