8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I39 



to nape, including the lores, wings (except inner lesser coverts), upper 

 back, and tail black ; sides of head, throat and neck, including hind- 

 neck, bright apricot yellow, becoming lemon chrome as the yellow 

 collar meets the black of the back; lesser wing coverts, except the 

 outermost, lemon chrome ; lower back, rump, and upper tail coverts 

 yellowish oil green ; breast, sides, flanks, abdomen, and under tail 

 coverts between warbler green and olive-green ; an indefinite light 

 wash of lemon yellow on center of breast and abdomen ; outer under 

 wing coverts Roman green, inner ones yellowish citrine ; under sur- 

 face of inner webs of primaries and secondaries, except toward the 

 tips, dull white. Bill dull black ; tarsus and toes fuscous ; claws dark 

 neutral gray (from dried skin). 



Measurements. — Males (3 specimens), wing 59.3-61.4 (60.6), tail 

 39.2-42.0 (40.2), culmen from base 14.0-14.8 (14.5), tarsus 23.8-24.5 

 (24.1) mm. 



Females (2 specimens), wing 59.5-60.0 (59.7), tail 38.2-38.3 (38.3), 

 culmen from base 14.7-14.7 (14.7), tarsus 21.0-21.5 (21.2) mm. 



Type, male, wing 59.3, tail 39.4, culmen from base 14.6, tarsus 

 23.8 mm. 



Range. — Isla Escudo de Veraguas, at sea off the base of Peninsula 

 Valiente, Bocas del Toro, Panama. 



Remarks. — The greater size of this handsome bird as compared 

 with mainland forms is evident on comparing the measurements with 

 those listed in succeeding paragraphs. In bulk the island birds appear 

 nearly one-third greater. In drawing the description comparison has 

 been made with cerritus since the shades of yellow on head and neck 

 of these two are more nearly in agreement. In terms of present distri- 

 bution Manacus v. vitellinus is assumed to be the form of the main- 

 land opposite Isla Escudo, since it is the one recorded at Cricamola 

 on the shores of Laguna de Chiriqui, opposite Peninsula Valiente. 

 Manacus v. cerritus is known to range south only to the southern 

 shores of Almirante Bay so that if the water barrier is disregarded, 

 cerritus and amitinus are separated by an intervening population of 

 typical vitellinus. 



The name is taken from the Latin amitinus, a cousin. 



To determine clearly the affinities of the manakin from Escudo a 

 survey has been made of the related members of the genus Manacus 

 found in Panama, particularly Manacus vitellinus, of which an excel- 

 lent series is at hand from the entire range including Colombia. It 

 became evident immediately that cerritus, described by James L. Peters 

 as a distinct species, was in fact a geographic race of M. vitellinus, 

 as the supposed specific characters break down when the entire area 



