1917.] Chapman, Distribution of Bird-life in Colombia. 325 



further emphasizes the faunal affinities of the western lower Atrato Valley 

 with eastern Panama. 



Except for a smaller amount of black on the sides in the male, pirrensis 

 agrees in color with rubrilateralis but in size it is nearer macvlicoronatus. 

 In the shape of its bill, however, examination of Nelson's series of seven 

 specimens in connection with those in our own collection from Salaqui, shows 

 that, in the adult, it possesses characters of its own. In rvhrilaieralis and 

 macvlicoronatus the bill has the same general relative proportions, it being 

 simply longer and deeper in the former; but the bill of ■pirrensis differs from 

 both that of the other two forms in having the outline of the culmen less 

 evenly rounded, more angular, with the apex slightly in advance of the nos- 

 tril, while its base is more compressed laterally and more elevated into a 

 well-definedlridge, which leaves on each side a distinct shelf at the anterior 

 edge of which the nostril opens. 



The differences in question are difficult to express by measurements but 

 are pronounced in the specimens themselves. 



Average Measurements of Females. 



Depth of 

 Bill at 

 Wing Tail Ex. Cul. NostrU 



4 C. TO. mocitKcororaaiiis (Canal Zone) 76.5 46.5 21 9.5 

 2 " " pirreresis (Cana) 77.5 47 21.5 10 



2 " " " (Salaqui) 75 45 22 9.5 



5 " " rubrilateralis (San Jos6) 82 49 22 10 



5 " " " (Puerto Valdivia) 81.7 48 21.5 10.7 



(1505) Capito squamatus Sah. 

 Capita squamatus Salv., Ibis, 1876, p. 494, pi. xiv (Santa Rita, Ecuador). 



Richardson secured a single male of this species at Ricaurte. It differs 

 from five Ecuador (Esmeraldas and Chone) specimens in having the fore- 

 head scarlet or scarlet-red rather than orange-chrome, while the sides of the 

 crown are more broadly black, the whitish central area being, therefore, 

 more restricted. Should these differences prove constant the Ricaurte 

 form would constitute a well-marked race. In any event, the occurrence 

 of squamatus in southwestern Colombia, emphasizes the close faunal rela- 

 tionships of this region with northwestern Ecuador rather than with west- 

 ern Colombia. 



Ricaurte, 1. 



