BIRDS OF NORTH AND MIDDLE AMERICA. 215 



view Am. Birds, 1864, 55 (Half-moon Cay, British Honduras). — Salvin and 

 GoDMAN, Biol. Centr.-Am., Aves, i, 1879, 27, pi. 3, fig. 2 (Corosal, British Hon- 

 duras, etc.). — Sharpe, Cat. Birds, Brit. Mus., vi, 1881, 331 (Cape Gracios a 

 Dios; coast Yucatan). — Boucard, Proc. Zool. Soc. Lend., 1883, 439 (Yuca- 

 tan). — Ridgway, Proc. U. S. Nat. Mus., viii, 1885, 562 (Cozumelj. — Salvin, 

 IVjis, 1885, 187 (Cozumel); 1888, 244 (Holbox, Mujeres, and Cozumel islands; 

 Lighthouse and Glovers reefs; range). 



[Melanoptila] glabrirostris Sclater and Salvin, Nom. Av. Neotr., 1873, 3. — 

 Sharpe, Hand-list, iv, 1903, 109. 



[ Turdiis] glabrirostris Gray, Hand-list, i, 1869, 258, no. 3774. 



GenLis MIMODES Ridgway. 



Mimodes Ridgway, Proc. U. S. Nat. Mus., v., sig. 3, June 5, 1882, 45. (Type, 

 Harporhynchiis graysoni Lawrence.) 



Medium-sized Mimidse (length about 250 mm.) with very dull and 

 plain coloration (uniform brown above, dull brownish white below), 

 short, rather stout, bill, and much rounded wing, with outermost 

 (tenth) primary more than half as long as eighth, ninth about equal to 

 first, the sixth and fifth longest. 



Bill much shorter than head (exposed culmen decidedly shorter 

 than middle toe without claw), its depth at frontal antiae equal to 

 nearly half the distance from nostril to tip of maxilla ; culmen straight 

 basally , gradually and increasingly decurved terminally ; gonys nearly 

 straight. Nostril rather small, longitudinally oval or elliptical, sur- 

 rounded (except for lower anterior portion) by membrane, the posterior 

 end scarcely touching the feathering of frontal anti^. Rictal bristles 

 distinct. Wing rather short (longest primaries exceeding longest 

 secondaries by about two-thirds the length of middle toe without 

 claw), much rounded; outermost (tenth) primary large, more than 

 half as long as eighth, the latter nearly as long as fourth, the ninth 

 about as long as first, the sixth and fifth longest. Tail about as long 

 as wing or longer (averaging longer, rarely very slightly shorter), 

 distinctly though slightly rounded, the graduation less than distance 

 from nostril to tip of maxilla. Tarsus rather long (about one-third 

 as long as wing or a little less), rather slender, the acrotarsium scutel- 

 late; middle toe (without claw) about two-thirds as long as tarsus; 

 lateral toes unequal, the inner (without claw) reaching to subterminal 

 joint of middle toe, the outer slightly beyond; hallux shorter than 

 inner toe, but much stouter; basal phalanx of middle toe adherent to 

 that of outer toe for basal half, almost wholly se})arated from that of 

 inner toe; claws normal as to length and curvature. 



Coloration. — Upper parts plain brown, under parts dull brownish 

 white;, no white on wings nor tail. Young with chest indistinctly 

 spotted with grayish brown. 



Nidification. — (Unknown . ) 



Range. — Socorro Island, Revillagigedo group, off northwestern 

 Mexico. (Monotypic.) 



