BIRDS OF NORTH AND MIDDLE AMERICA. 435 



Hemistilbon"^ Gould, Introd. Troch., oct. ed., 1861, 149. (Type, Amazilia ocai 



Gould.) 

 Erythronotab Gould, Introd. Troch., oct. ed., 1861, 160. (Type, Ornismya 



erythronota Lesson.) 

 Eratina c Heine, Journ. fiir Orn., xi, May, 1863, 190. (Type, Trochilus iodurus 



Saucerotte.) 

 Eratopisd Heine, Journ. fiir Orn., xi. May, 1863, 191. (Type, Trochilus cyani- 



frons Bourcier.) 

 Erasmia « Heine, Journ. fiir Orn., xi. May, 1863, 191. (Type, Erythronotaf 



elegans Gould.) 

 Ariana Mulsant and Verreaux, Mem. Soc. Imp. Sci. Nat. Cherb., xii (ser. 2, 



ii), 1866, 180 (Olassif. Troch., 1866, 35). (Type, Trochilus nivcoventer Gould.) 

 Lisoria Mulsant, Ann. Soc. Linn. Lyon, n. s., xxii, 1876, 207 (Cat. Ois.-Mouch., 



1876, 11). (Type, Hemithylaca warszewiczi Cabanis and Heine.) 

 Leucodora Mulsant, 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 Trochilidse (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 Ecuador, Venezuela, Tobago, and Granada. 

 (About twenty-two species.) 



a 'HpLi, semi, et az'cX^ojv^ micans. (Gould.) 



* ^EpuOpog, ruV>er, et vwror, dorsum. (Gould.) 



c iparstvoc- (Heine.) 



d " Epa7wnic (lieblichen Blick's)." (Heine.) 



« "Von ipaujjiioc lieblich, anmathig, angenehm." (Heine.) 



