
ILLUSTRATIONS OF ORNITHOLOGY. 
TACHYPHONUS SERRIROSTRIS, Srrickianp. 
THIs species is remarkable for possessing six or seven distinct 
though rather irregular denticulations, directed forwards as in the 
Toucans, on the medial portion of the margins of both mandibles. 
This peculiarity of structure might almost justify the formation of 
a new genus, were it not that the close resemblance of the color- 
ation of this bird to that of Tachyphonus desmaresti, and of T. 
cristatus, proyes an intimate affinity to exist between these three 
birds. In Taehyphonus cristatus there is a single prominent un- 
dulation, almost amounting to a tooth, on the margin of the upper 
- mandible, which leads us to the closely allied genus Lanio, where 
this tooth is still more developed. In the genus Pyranga also, we 
find marginal serrations, more or less conspicuous in the different 
species, so that this structure is by no means anomalous in Tana- 
grine forms. j 
The genus Phytotoma, well known for its serrated mandibles, 
belongs, there can be no doubt, to the family of Tanagers ; but it 
is distinguished from all the other genera, by possessing a double 
margin to the lower mandible, of which the inner one is serrated, 
the outer plain. 
Front and sides of head, hind neck, upper back, wings, upper 
tail-covers, and tail, black ; proximal portion of lesser wing-covers 
white ; crown yellow; lower back and rump ochre yellow; throat 
ochre yellow, separated from the breast by a narrow black band ; 
lower parts deep ochre yellow, passing into ferruginous on the 
breast and middle of the belly ; tibiee black ; lower wing-covers and 
basal part of inner webs of remiges white; beak black; base of 
lower mandible plumbeous ; legs black. 
Total length, 6.3; beak to front, 5; to gape, 7; wing, 3; me- 
dial retrices, 3; external, 9.8; tarsus, 6. 
Inhabits Peru. 
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