20 
I N T R ODUC T 1 O N. 
Dr. Gambel states that C. Douglasii and C. degam are opposite sexes of the same species, the female 
being characterized as the former, and the male as the latter; and adds, that in the Collection of the 
Academy of Sciences of Philadelphia, there are two specimens procured by himself, which he says are 
certainly male and female of the same species, and of these the male agrees with C. elegans, and the female 
with C. Douglasn : notwithstanding, I am still inclined to the opinion stated above, until additional 
evidence of my being in error has been received. 
21. Callipepla squamata ....... PI. XIX. 
For the sixth division I propose the name of 
DENDRORTYX, 
WITH THE FOLLOWING CHARACTERS 
Rostrum brevins et lateralitbr minus compression quam in Odonlophoro , fortius, ita, et apud apicem minus aduncum; 
mandibuld inferiore lata, recta, et utrinque denticulis duobus distinetis instructs; tomiis acutis, non introrsdm 
curvatis; naribus aliquanto magnis, membranti obtectis, et marginatis; caput efistatum; orbitis vix plumis 
denudatis ; alee breves, concavse, primariis minds rigidis quam in Odonlophoro, quintal et sexta longioribus ; cauda 
lata, rotundata, mediocris, et e plumis duodeeim rigidis confecta; tarsi reticulati, minus robusti quam in 
OdontopJioro; digitis modicis, membrana basali conjunetis; digito intex-iore cseteris breviore; halluce debili; 
unguibus paulb longis, levithr curvatis; margine interno dilatato, et acuto. 
Bill shorter, and not so much compressed on the sides as in Odontophorus, thicker arid less hooked at the point; 
under mandible broad, straight, and armed with two distinct dentations on each side; tomia sharp, but not 
curving inwards ; nostrils rather large, covered and boi’dered with a membrane; head crested; orbits but 
slightly denuded of feathers; wings short and concave; primaries less rigid than in Odontophorus, the fifth 
and sixth the longest: tail broad, rounded at the end, proportionate to the size of the bird, and composed of 
twelve stiff feathers ; tarsi spurless, reticulated, much less powerful than in Odontophorus ; toes moderately 
long, united at the base by a membrane, the inner of the anterior toes the shortest; posterior toe feeble; nails 
rather long and slightly curved, the inner edge dilated and sharp. 
Of this form there are at present three species known ; they are the largest members of the whole group, 
being* almost equal in size to a Ptarmigan or Red Grouse. Judging from the more slender structure of 
their tarsi and feet, I believe them to be arboreal in their habits, and the delicate but bright colouring of 
their bill and legs seems to me to indicate that they affect situations very different from those resorted to 
by the members of the genus Odontophorus. 
