314 Mr. D. G. Elhot on the Trochilide. 
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. vii. 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, pl. 18. 
Cyanomyia cyanocephala, Gould, Mon. Troch. vol. v. 286 ; 
et Intr. Troch. p. 147, sp. 315. . 
Cyanomyia guatemalensis, Gould, Intr. Troch.p. 148, sp. 316. 
Hab. Mexico (Sallé); 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 hasa rather extensive range, 



