352 Miscellaneous. 



pleasanter to work with them than with object-slides of common 

 glass. The author's object-slides of canary-glass of medium colour 

 are 2-3 millim. in thickness. The thicker ones are more serviceable 

 than the thin ones, so that they may be employed with advantage of 

 a thickness of 3-4 millim. — Sitzanysber. der Akad. der Wiss. zu 

 Wierii, xxi. p. 430. 



0?i two Neiv Species of Humming Birds belo7iging to the genus 

 Amazilius. By John Gould, F.R.S., V.P.Z.S., etc. 



Amazilius cerviniventris, Gould. 



Head, all the upper surface and wing- and upper tail-coverts 

 bronzy-green ; wings purplish-brown ; tail dark chestnut-red, each 

 feather narrowly bordered and tipped with a bronzy lustre, which is 

 of greatest extent and most conspicuous on the two centre tail- 

 feathers ; throat and chest luminous green ; under surface of the 

 shoulder and flanks dull green ; abdomen and under tail-coverts fawn- 

 colour ; thighs white ; upper mandible yellow at the base, merging 

 into brown and tipped with black ; under mandible pale yellow, ex- 

 cept at the tip, which is black. 



Total length, 4 inches; bill, if; wing, 2^ ; tail. If. 



Hah. Cordova, in Mexico. Collected by M. Salle. 



Tiemarh. — This species is about the size of A. Riefferi ; but its 

 bill is less robust ; the wings, as in that species, are uniform pur- 

 plish-brown ; the chestnut colouring of the tail-feathers and the 

 under tail-coverts is of a somewhat lighter hue. 



Amazilius castaneiventris, Gould. 



Crown of the head, upper part of the back and shoulders reddish- 

 bronze ; rump and upper tail-coverts greyish, wdth a bronzy lustre ; 

 wings purplish-brown, with the exception of the basal portion of the 

 primaries and secondaries, which are rufous ; tail dark chestnut, 

 tipped with a bronzy lustre, of greatest extent and most conspicuous 

 on the centre feathers ; throat, fore part of the neck, breast, and 

 upper part of the abdomen shining golden-green ; under surface of 

 the shoulders, lower part of the abdomen and under tail-coverts fine 

 chestnut-red ; thighs white ; upper mandible brownish-black ; under 

 mandible fleshy-yellow, except at the tip, which is brownish-black. 



Total length, 3|^ inches ; bill, \; wing, 2-—^; tail, \\. 



Hah. Santa Fe de Bogota. From the Collection of Mr. Mark. 



Remark. — This species differs from A. cerviniventris in the much 

 greater depth of the chestnut colouring of the abdomen, under tail- 

 coverts and tail ; in size it is considerably less than that species, 

 being even smaller than A. Arsinoe, to which it offers an alliance in 

 the colouring of its wings, but from which it difi'ers in the colouring 

 of its abdomen ; the white feathers of the thighs are much developed 

 and very conspicuous. — Proc. Zool. Soc. June 10, 1856. 



