BIRDS OF NORTH AND MIDDLE AMERICA. 537 
THALURANIA RIDGWAYI Nelson. 
MEXICAN WOOD-NYMPH. 
Adult male—Forehead and crown metallic violet-blue; occiput, 
nape, and sides of hinder crown (superciliary region) dark metallic 
bluish green, appearing nearly black when viewed from in front; 
hindneck, back, scapulars, wing-coverts, and rump uniform metallic 
bronze-green, the upper tail-coverts darker; tail uniform black, 
faintly glossed with bluish; remiges dusky, faintly glossed with vio- 
laceous; malar and rictal regions, chin, throat, and chest bright 
metallic yellowish emerald green; rest of under parts dull blackish, 
the sides and flanks glossed with metallic bronze-green; bill black; 
iris dark brown; feet blackish; length (skin), 96; wing, 56; tail, 
35.5; culmen, 17.4 
Adult female unknown. 
Western Mexico, in State of Jalisco (San Sabastian). 
Thalurania ridgwayt Newson, Auk, xvii, no. 3, July, 1900, 262 (San Sabastidn, 
Jalisco, s. w. Mexico; coll. U. 8. Nat. Mus.). 
Genus LEPIDOPYGA Reichenbach. 
Lepidopyga Reicuensacu, Troch. Enum., 1855, 7. (Type, Trochilus goudoti 
Bourcier.) 
Emilia Muusant and Verreaux, Mém. Soc. Imp. Sci. Nat. Cherb., xii (ser. 2, 
ii), 1866, 165, in text (Classif. Troch., 1866, 41). (Type, Trochilus goudoti 
Bourcier.) 
Arinia (not of Adams, 1858, nor Schin [?], 1862) Muusant, ‘‘Ann. Soc. Linn. 
Lyon, 1877, Oct. 12. (Type, A. boucardi Mulsant.) 
Arena (not of Fauv[ier?], 1862) Muxtsant, Descr. d’une esp. nouv. de Troch., 
Oct. 12, 1877, 5. (Type, A. bowcardi Mulsant.) 
Rather small Trochilide (length about 85-95 mm.) related to 
Agyrtria, but differing in relatively much longer and distinctly 
forked tail, much narrower lateral rectrices, and more naked tarsi. 
Bill longer than head, rather stout, terete, very faintly decurved; 
culmen broadly rounded, but mesorltinal portion distinctly ridged; 
tomia smooth; median lateral sulci of maxilla and mandible rather 
indistinct. Nasal operculum moderately broad, feathered for up- 
perposterior portion or inner half (more or less). Tarsus feathered 
for upper half (more or less), rather slender; middle and inner 
toes equal in length or the former slightly the longer, outer toe 
slightly but distinctly shorter; hallux shorter than outer toe. Wing 
nearly three times as long as exposed culmen, the outer primary 
@ One specimen (the type). 
6 “Thus quoted in ‘The Ibis’ and ‘ Zool. Rec.’ (1878) from a specimen copy of 
this paper, but not published in the work alluded to.” (Salvin, Cat. Birds Brit. 
Mus., xvi, 1892, 193, footnote.) 
