1917.] Chapman, Distribution of Bird-life in Colombia. 389 



Orinoco (La Union), British Guiana and Cayenne by the greater inten- 

 sity and greater extent of the black of the underparts, and their much 

 darker ventral region and under tail-coverts. They also have the tail 

 broadly black terminally and raw umber basally, while in most specimens 

 of colma it is more olivaceous basally and more narrowly tipped with black. 



The material at my command, therefore, indicates the validity of a 

 black-bellied form for which the name nigrifrons Gould is probably available. 

 (Consult, however, Hellmayr, Nov. Zool., XIV, 1907, p. 390.) 



Formicarius nigrifrons glaucoptera Ridgw. (Proc. IT. S. N. M., XVI, 

 1893, p. 673), the type of which, from British Guiana, is in the American 

 Museum (No. 43536) is apparently not separable from F. c. colma. 



La Morelia, 3; Florencia, 1. 



(2156a) Formicarius analis connectens Ch'apm. 



Formicarius analis connectens Chapm., Bull. A. M. N. H., XXXIII, 1914, p. 173 

 (Villavicencio, Colombia). 



Char, subsp. — Most nearly related to F. a. saturatus Ridgw., but cinnamon at 

 the sides of the throat wholly absent or but faintly indicated; upperparts less rufes- 

 cent, more olivaceous, breast slightly darker, throat-patch less sharply defined, 

 size smaller, cf, wing 86; tail, 52; tarsus, 31.5; culmen, 18 mm. 



This well-marked race is known only from the Tropical Zone at the 

 base of the Eastern Andes. Specimens from La Morelia are somewhat 

 darker above than those from Villavicencio. 



La Morelia, 3; Villavicencio, 3. 



(2157) Formicarius nigrica'pillus destructus Hart. 



Formicarius destructus Hart., Nov. Zool., V, 1898, p. 493, (Paramba, n. w. 

 Ecuador). 



Formicarius analis destructus Hellm., P. Z. S., 1911, p. 1173 (N6vita). 



A female from San Jose is duller than the type of F. n. nigrica'pillus and 

 can be matched by several of our fourteen Ecuadorian specimens of des- 

 tructus. The occurrence of nigricapillv^ and a second form of this group 

 {"Formicarius umbrosus" Ridgw.) in the same zone (Caribbsean Tropical) 

 in Costa Rica indicates their specific distinctness. Ridgway (Bull. 50, V, 

 p. 118) evidently holds this view but ranks nigricapillv^ as a subspecies of 

 analis, while umbrosus with allied forms is placed under F. moniliger as 

 Formicarius moniliger umbrosus. To my mind, however, the derivative re- 

 lationships of umbrosus are with analis, while nigricapillvs and destructus, 

 its closely allied representatives in the Tropical Zone of western Colombia 



