292 Hans von Berlepsch on new Trochilidae. 



2. Iache lawrencei^ sp. n. 



Circe latirostris, Lawr. (nee Swains.) Proc. Boston Soc, 

 N. H. 1871 (Tres Marias) . 



I. laivrencei, sp. n., /. latirostri (Sw.) affinis, differt giila 



circumseripte splendide glauco-viridi (nee chalybeo- 



eyaneo), tectricibus snhcaudalibus obscure griseis disco 



late chalybeo-nigris, tectricibus supracaudalibus item 



obscurius viridibus. Long. tot. 90-93, al. 53^, caud. 34^, 



rostr. 19-17^j caudse furca 8^-8 mm. 



Habitat in insulis Tres Marias (coll. Grayson et Forrer). 



Mus. U. S. National Mus. et Mus. H. v. B. (two c? ad., 



Tres Marias, obtained by Alplionse Forrer, 23rd February 



and 4th May). 



The lache inhabiting the Tres Marias Islands, hitherto 

 believed to be identical with the mainland species, viz. the 

 well-known /. latii'ostris (Sw.), on closer examination proves 

 to be perfectly distinct from it. The chief point of difference 

 is to be found in the colour of the throat, which in the Tres 

 Marias bird is of a brilliant deep golden green with a slight 

 shade of bluish green, while it appears splendid steel-blue or 

 violet water-blue in /. latirostris. As a rule, in /. latirostris 

 the breast and abdomen show a bluish-green tint, while in the 

 Tres Marias bird a rather golden or bronzy hue is prevalent 

 on these parts of the body. 



Another important character by which the new species 

 might well be distinguished lies in the pattern o£ the under 

 tail-coverts, which, in this bird, are conspicuously spotted 

 with steel-black and broadly margined with greyish white, 

 producing a rather sombre colouring. In /. latirostris, on 

 the contrary, they appear nearly uniform white, presenting 

 only indefinite spots of pale smoky brown, which are darker 

 and larger on the smaller coverts, but nearly absent on the 

 longer ones. 



As a rule, the upper parts in the Tres Marias bird are 

 more indued with coppery bronze, but I have specimens of 

 /. latirostris which in this respect are hardly different from 

 it. The upper tail-coverts in the former are certainly of a 

 darker or a more sombre green. It appears that the new 

 species generally possesses a shorter bill, but I have speci- 



