Birds of Fernando Po. 389 



At Sipopo, on November 6, towards evening, a flock of 

 these Swifts suddenly appeared in the vicinity of our house, 

 which was situated on high ground, about two miles from 

 the sea. We observed these birds on several other 

 occasions. 



There is a specimen of Tachornis gracilis in the British 

 Museum labelled " Fernando Po/' but the locality may be 

 doubted (see p. 400). 



80. Heterotrogon francisci. 



Heterotrogon francisci Alexander, Bull. B. O. C. xiii. p. 33 

 (1903) ; Bocage, Jorn. Lisb. (2) vii. p. 38 (1903 : Fernando 

 Po) ; Salvad. Orn. Golfo d. Guinea, iii. p. 116. 



Adult female. Allied to H. vittatum, but differs in being 

 considerably smaller, and in having the white bars on the 

 greater wing-coverts and secondaries wider and more distinct : 

 iris reddish brown ; upper mandible black, lower orange- 

 yellow ; soft parts orange-yellow ; legs and feet yellowish 

 flesh-coloured. Total length (measured in flesh) 9'4 inches, 

 culmen 0*6, wing 4*4, tail 49, tarsus 06. 



Type. Bakaki, 4000 feet, Nov. 18, 1902. Breeding. 



This is a rare bird, and is one of the best discoveries made 

 by my collector. Its scarcity can be judged by the fact 

 that the Boobie hunters had never seen it before. It is very 

 shy and keeps much to the undergrowth. My collector 

 obtained only one specimen out of a pair which he saw. 



Named after Colonel Boyd Francis Alexander. 



81. EurystoiMus gularis Vieill. 



Eurystomus gularis Bocage, Jorn. Lisb. (2) iv. p. 7 (1895 : 

 Santa Isabel, Fernando Po) ; Shelley, B. Afr. no. 1511 

 (1896); Sharpe, Hand-1. B. ii. p. 47 (l'JOO) ; Bocage, 

 Jorn. Lisb. (2) vii. p. 31 (1903 : Fernando Po) ; Salvad. Orn. 

 Golfo d. Guinea, iii. p. 117. 



Observed on one occasion only. 



82. Merops Marions. 



Merops marionis Alexander, Bull. B. O. C. xiii. p. 33 (1903) ; 

 Bocage, Jorn. Lisb. (2) vii. p. 39 (1903) ; Salvad. Orn. Golfo 

 d. Guinea, iii. p. 117. 



