33. TROGLODYTES. 253 



web. Total length 4-5 inches, culmen O'G, wing 2'05, tail 1-9, 

 tarsus 0-8. 



The description is taken from a Costa-Ilican specimen collected by 

 Mr. Boucard in March 1877, which therefore may be considered in 

 full spring plumage. Throughout the breeding-season the feathers 

 become considerably worn and abraded, and an ashy shade is per- 

 ceptible on the upper parts and on the wings, caused by the wearing 

 of the edges of the feathers : this is shown by a specimen in the 

 possession of Messrs. Salvin and Godman (Tucurriqui, Costa Eica, 

 Oct. 1864 ; E. Arce). After the autumn moult the plumage is 

 darker and of a much deeper brown, and the underparts are also 

 more ruddy ; there is in this respect a decided ditference between 

 the spring and autumn plumage, but it is only a question of depth 

 of tint. YouiKj hirds may be recognized at a glance by their uni- 

 form rufous under tail-coverts, and there are generally a few dusky 

 edgings to the feathers of the throat and breast ; the cheek-feathers 

 are also often edged with dusky. The barring on the wings and tail 

 is much coai'ser and broader than in the adult, and there are fewer 

 bars ; otherwise young birds resemble the old ones. After their 

 first moult they appear like the adults in winter plumage, but are 

 rather more rufous and are recognized at once by the uniform rufous 

 under tail-coverts, which they appear to retain even after aU trace 

 of dusky barring has disappeared from the breast. The following is 

 a series of measurements of the present species, taken from the 

 Museum series and the specimens in the collection of Messrs. Salvin 

 and Godman. 



Yucatan. A specimen collected in the northern part of this country 

 by Mr. G. F. Gaumer measures as follows : — Total length 4-5 inches, 

 culmen 0-6, wing 1'95, tail 1"0, tarsus 0'7. It looks like a dark 

 race of T. domesticus with strongly marked fulvous-brown chest and 

 flanks. 



Guatemala. lilessrs. Salvin and Godman have a fine series from 

 this country, and the contrast of the reddish-brown under surface is 

 very marked when compared with a series of the true T. donKsticus 

 or T. parlmanni. In every instance the proportions of the first and 

 second quills are those of the T. domesticus form, the first primary 

 being more than half the length of the second. The following are the 

 measurements of the series :— 



Total 

 length. Ciilmen. Wing. Tail. Tarsus, 

 in. in. in. in. in. 



ff. Ad. r>uena9 (O. /S.i^-P. Z). G^.). A'o OG 2'05 1(5 0-7 



b. Juv. Duenas 4-0 0-5 185 1-5 07 



c. .Tuv. Duenas (O. ^.) 4-0 06 1-9 1-5 07 



rf. .Tuv. IJetaluleu (0.5'.<§-J'.Z).G.). 4-0 0-55 IvSo 1-4 OOo 

 f. .\d. V.'raPa7.(0..S'. ^i^.i). G.). 40 06 1-9.5 lo 07 

 /. Ad. Vera Taz {O. S.) 40 00 l-8o lo 0&5 



Nicaraf/ua. One specimen, collected by ^Ir. Belt at fhontales, has 

 been lent to mo by ^lessrs. Salvin and (iodman. It is a young 

 bird and I therefore do not give the measurements, but it agrees 

 thoroughly with the Guatemalan examples. 



