31G 
DR. R. W. SIIUFELDT’S MORPHOLOGICAL 
space, aucl thus convert these openings into veritable vacuities, as 
is the case in all of the Oscines that I have alluded to elsewhere. 
Otocoris agrees in this respect with the Oscines, as may be 
seen in my side-view figure of its pelvis (Contrib. Anat. Birds, 
pi. iv. fig. 22). 
The post-pubis in Ampelis extends but slightly beyond the 
hinder extremity of the ischium, which latter meets it behind 
in a broad foot-like process. These parts in the dried skeleton 
are very apt to curl outwards, and deceive us as to the true 
shape of this part of the pelvis during life ; so that it is only in 
fresh specimens that we can gain a correct notion of this bone 
in most Passeres. 
This post-preparatory deformity of this part of the skeleton 
has been taken into consideration in figure 7, and duly corrected. 
The coccygeal vertebrae and pygostyle in Ampelis require no 
special description, for they agree in all essential particulars with 
the parts as found among the Oscines generally. They are very 
well shown in my figure of the skeleton of Otocoris, alluded to 
above. 
In Tyrannus the coccygeal vertebrae are comparatively very 
large and their diapophyses very broad. 
26. As we would naturally be led to suspect, the sternum of 
Anipelis is, of course, a thoroughly Passerine one, having the 
characteristic bifurcation of the manubrium ; the lofty costal 
processes, the well-developed and deep carina, the cordate- 
shaped notch on either side of the xiphoidal extremity, and the 
jive facets upon either of its costal borders. 
Among the American Tyrannidce the sternum has essentially 
the same shape, but it has only four facets for the haemapophyses 
upon each of its costal borders. 
A fuller description of this bone will not be required here. I 
have already published a pectoral view of a typical Passerine 
sternum elsewhere (Coues’s ‘ Key,’ 2nd ed. fig. 58), and other 
forms of it may be seen in my figures of the sterna of Lanius, 
Otocoris, and others, in memoirs already cited. 
This bone will be taken into consideration again, further on, 
when we come to treat of the sterna of the Swallows, Swifts, and 
Humming-birds. 
27. The elemeuts of the shoulder-girdle in Ampelis more 
closely resemble those parts in the typical Oscines than in 
the Clamatores. In form and arrangement they make scarcely 
