882 



REVIEW OF AMEEICAN BIRDS. 



[part I. 



1.40; length of bill from forehead, .55, from nostril, .34, along gape, .62; 

 tarsus, .60. 



The comparison of many specimens of the grayheaded Hylophilus 

 of Guatemala, with others from Panama, exhibits, on the whole, the 

 differences referred to, as stated by Mr. Lawrence, but they are ex- 

 ceedingly slight, and may not unreasonably be referred to the influ- 

 ence of season or locality. Of the three types of Mr. Lawrence, 

 two, in which the olive green of the cap is most distinct, and the 

 size least, are decidedly immature birds ; the third (No. 400), how- 

 ever, is adult, and although the color referred to is reduced in 

 amount, it is still quite appreciable. 



Unmistakably adult specimens from Costa Rica and Nicaragua 

 are still smaller than those from Panama, as shown by the measure- 

 ments given above. They are even brighter yellowish above than 

 in the type, the edges of some of the feathers almost yellow. Com- 

 pared with Guatemalan skins of unmistakable decuriatus, the 

 difference is very appreciable. 



A young bird, scarcely full fledged, has the olive of back soiled 

 with buff, the top -of head is dull sepia brown, and the olive of back 

 is tinged with the same. 



I am not satisfied as to the existence of more than one species, 

 but for the present retain pusillus, and await further evidence to 

 determine the question. 



(400.) Type. (401.) Type. (174.) Type. 



IiALETES, SCLATEB. 



Laletes, Sclatee, P. Z. S. 1861, 72. (Type Z. osburnii.) 



General appearance that of a, Vireo. The rather pointed wings, are longer 

 than the narrow, nearly even, slightly rounded tail. First primary about half 

 the second, which about equals secondaries ; the 4th quill longest. Bill deep 

 and much compressed from base ; depth two-thirds the distance from nostril to 

 tip. Culmen straight for basal third, then decurving to the Jiooked, deeply 

 notched bill ; gonys also curved. Commissure slightly arched. Nostrils 



