BIRDS OF NORTH AND MIDDLE AMERICA. 435 
Hemistilbon  Goutp, Introd. Troch., oct. ed., 1861, 149. (Type, Amazilia ocai 
Gould. 
oo GouLp, Introd. Troch., oct. ed., 1861, 160. (Type, Ornismya 
erythronota Lesson.) 
Eratina ¢ Herne, Journ. fiir Orn., xi, May, 1863, 190. (Type, Trochtilus iodurus 
Saucerotte.) 
Eratopis¢ Heine, Journ. fiir Orn., xi, May, 1863, 191. (Type, Trochilus cyant- 
frons Bourcier.) 
Erasmia ¢ Heine, Journ. fiir Orn., xi, May, 1863, 191. (Type, Erythronota? 
elegans Gould.) 
Ariana Muusant and Verreaux, Mém. Soc. Imp. Sci. Nat. Cherb., xii (sér. 2, 
ii), 1866, 180 (Classif. Troch., 1866, 35). (Type, Trochilus niveoventer Gould.) 
Lisoria Muusant, Ann. Soc. Linn. Lyon, n. s., xxii, 1876, 207 (Cat. Ois.-Mouch., 
1876, 11). (Type, Hemithylaca warszewiczt Cabanis and Heine.) 
Leucodora Mutsant, Ann. Soc. Linn. Lyon, n. s., xxii, 1876, 206. (Type, Trochi- 
lus edward Bourcier and Delattre.}\—MuLsant and VERREAUX, Hist. Nat. 
Ois.-Mouch., i, 1874, 309. 
Medium-sized to rather small Trochilide (length about 85-95 mm.) 
closely related to Amizilis and Agyrtria, but differing (especially from 
the former) in narrower bill, scarcely widened at base, thinner (less 
tumid) and less exposed nasal operculi, and (usually) more deeply 
emarginate, black or dark steel blue (but sometimes bronzy) tail. 
Bill slightly to decidedly longer than head, straight or very faintly 
decurved, rather slender, narrow (not conspicuously wider than deep), 
not noticeably widened basally; nasal operculi thin, with only outer 
and anterior halves exposed; wing normal; tail slightly to decidedly 
more than half as long as wing, more or less deeply emarginate, with 
outermost pair of rectrices usually longest, but sometimes shorter 
than next pair; tarsi feathered; outer toe about equal to middle toe, 
the inner toe slightly shorter, or lateral toes about equal and both 
slightly shorter than middle toe. 
Coloration—Above rather dark metallic green, the upper tail- 
coverts or rump (or both) sometimes coppery or reddish bronze, the 
pileum sometimes (in one species) dark metallic blue; tail usually 
dark steel blue or blackish, sometimes bronzy; under parts (except 
under tail-coverts) metallic green, the femoral tufts and leg feathers 
(sometimes whole abdomen) white. Sexes alike. 
Range.—Mexico to Ecuadér, Venezuela, Tobago, and Granada. 
(About twenty-two species.) 
o ‘Hy, semi, et oréABwy, micans. (Gould.) 
6 ’EpuOpdc, ruber, et vatoc, dorsum. (Gould.) 
¢ épatecvoc. (Heine.) 
4 “ Koatdnec (lieblichen Blick’s).’’ (Heine.) 
e “Von éodoptoc lieblich, anmathig, angenehm.’’ (Heine.) 
