- 
172 “as the grallatorial type of 
the Cuculide, forms our 
genus Leptostoma ; and it” 
Ut is highly probable, al- — 
qj)" though ‘their ills are 
yi//; Shorter, that the two spe- — 
Aix) cies above quoted will 
Hlikewise belong to the 
same group. The head 
and feet, here represented 
of the natural size (fig. 
172.),arecompletely those 
of a rasorial bird except- 
ing the toes, which indi- 
cate that link by which it 
is united to the cuckows. 
A more perfect union, in- 
deed, of the two circles of 
the Scansores and the 
Rasores could scarcely be 
imagined ; for, were the 
toes not placed in pairs, 
Leptostoma would, to all 
intents and purposes, be a 
rasorial genus. The wings 
are uncommonly short ; 
and its legs, for a cuckow, 
very long: it thus pre- 
serves its analogy to Cen- 
tropus, which is also a 
grallatorial type. 
(158.) The union of 
the three great tribes of 
lations, special permissions, &c, are necessary to ‘* prevent coalition,” or 
rather clashing, among naturalists, artists, &c. The fallacy of this reason- 
ing is best shown in the case before us. Long before the bird in question 
came into the possession of the Zoological Society, I carefully examined, 
and named it in the catalogue of the Mexican Museum: the results, how- 
ever, I have never, until now, published; and yet this very specimen has ~ 
remained in the Society’s museum near ten years, without any published 
account of it (as far as I can learn) appearing, although it is certainly the ; 
