2 Messrs. Salvin and Elliot on the Trochilidse. 



Division A. (Phaethornis, Sw.) 



a. Species with median gular stripe. 



a' Buff beneath. 



Rump narrowly edged with fulvous .... 1. P. super ciliosus. 



Rump broadly edged with fulvous .... 2. P. longirostris. 

 b' Grey beneath. 



Rump banded with grey 3. P. hispidus. 



c' Rufescent beneath. 



Upper tail-coverts clear rufous 4. P. syrmatophorus, 



b. Species with scale-like markings on the throat. 



d! Rufescent beneath. 



Large 5. P. eurynome. 



Small 6. P. squalidus. 



e' Whitish beneath 7. P. anthophilus. 



Division B. 



Greyish white beneath ' 8. P. august i. 



Rufescent beneath 9. P. pretrii. 



Division C. {Toxoteuches, Cab. & Hein.) 



Base of rectrices black 10. P. yaruqui. 



Rump and base of rectrices green 11. P. guyi. 



Rump and base of rectrices bluish green 12. P. emilia. 



Division D. (Ametrornis, Reich.) 



Pale buff beneath 13. P. bourcieri. 



Deep rufous beneath 14. P. philippii. 



Before proceeding to the details referring to the above 

 species, we will attempt to show the amount of individual 

 variation to which these birds are subject. As regards the 

 bills, measuring from the posterior end of the nostril to the 

 tip, along the chord, we find that, in Panama specimens of P. 

 longirostris, one is T62 long, while another is only 1*45, 

 showing a difference of • 17 of an inch, others, again, being 

 intermediate. Cayemie specimens of P. superciliosus vary 

 in the length of their bills from 1*78 to 146, with interme- 

 diate gradations. Rio-Janeiro specimens of P. squalidus 

 vary from 1*02 to '90. Instances of similar variation are to 

 be found in all the species, as regards their bills. The wing 

 also varies in length, and we find that, in Panama specimens 

 of P. longirostris, one is 2*1 in length, from carpal joint to tip, 



