256 Mr. O, Salvin on the Birds of the 



Several young males and females of this species, which has 

 already been recorded from Belize. 



-i-51. Petrochelidon pyrrhonota. 



Petrochelidon pyrrhonota (Vieill.) ; Salv. & Godm. Biol. 

 Centr.-Am., Aves, i. p. 226. 



Cozumel I. 



A single specimen. The migrations of this species are not 

 well known, for though it breeds in Western Mexico, its 

 passage southwards has been very imperfectly traced. We 

 have no previous record of it anywhere on this coast or in 

 Guatemala. 



52. HlRUxNTDO ERYTHROGASTER X SWAINSQNI. 



A single specimen, shot in May 1885 by Mr. Gaumer on 

 Cozumel Island, we have little doubt is a hybrid between 

 Hirundo erythrogaster and Petrochelidon swainsoni, as it 

 curiously combines the characters of both birds. The fore- 

 head is the same in both species, but the ear-coverts and the 

 collar are steel-blue, as in H. erythrogaster ; the tail is also 

 furcate, though to a less extent, and the lateral feathers have 

 ■L the characteristic white spots ; the wings, too, are as long as 

 those of H. erythrogaster, and the under tail-coverts are tinged 

 with rufous. The characters it has with P. suminsoni are 

 the colouring of the under surface, including the black gular 

 patch ; it also has the rump rufous grey. 



Instances of hybrids between H. erythrogaster and P. pyr- 

 rhonota have been recorded, but this is the first we have met 

 with in which P. swainsoni appears to have been one of the 

 parents. 



y -^3. Hirundo erythrogaster. 



Hirundo erythrogaster, Bodd.; Salv. & Godm. Biol. Centr.- 

 Am., Aves, i. p. 232. 



Cozumel I. (April) ; Ruatan I. 



Abundant in winter or during passage throughout Mexico, 

 Central America, and the greater part of South America, as 

 well as the West-Indian Islands. 



