314 Mr. D. G. Elliot on the Trochilidse. 



bill in the adult in both shape and colour cannot be distin- 

 guished from that of the previous species ; while I am not able 

 to perceive any material difference in the shape of the tail. 

 The only appreciable distinction between the two forms is, that 

 the tail of the present bird possesses a bronzy red hue, which 

 I have not yet met with in any example of C. quadricolor . 

 Should such be found, however, it would seem impossible to 

 continue the two forms as distinct species, I have one spe- 

 cimen from Oaxaca [Boucard) which has a deep bluish-green 

 head, exactly similar to that of C. quadricolor, but with a 

 bronze-red tail. It will thus be seen how close the two forms 

 are ; and if they are not the same, they are probably ^but local 

 races of one species. 



Cyanomyia viridifrons. 



Cyanomyia viridifrons, Elliot, Ann. & Mag. Nat. Hist. 

 1871, vol. viii. p. 267. 



Hab. Putla, Mexico [Rebouch). 



Three specimens of this species were procured by M. Rebouch 

 at Putla, and described by myself as above. It is between , 

 C. quadricolor and C. cyanocephala, having the flanks a 

 metallic green, like the latter species. It differs from all the 

 known forms of this genus in its dark green head, but slightly 

 metallic, and in its brilliant tail, metallic golden, with a pur- 

 plish red tip. I have never seen but the three examples 

 mentioned. 



Cyanomyia cyanocephala. 



Ornismya cyanocephala, Lesson, Suppl. Oiseaux-Mouches, 

 p. 134, pi. 18. 



Cyanomyia cyanocephala, Gould, Mon. Troch. vol. v. pi. 286 ; 

 et Intr. Troch. p. 147, sp. 315. 



Cyanomyia guatemalensi^, Gould, Intr. Troch. p. 148, sp. 316. 



Hab. Mexico [Salle) ; Guatemala [Salvin] ; Honduras 

 (Taylor). 



Lesson described the present species as the young of C. qua- 

 dricolor, called by him cyanocephala ; but both his description 

 and plate are sufficiently accurate to show that it was the pre- 

 sent bird he had before him. It has a rather extensive range. 



