No. 3.] POSITION OF CHAMAA. 491 
vis of Chame@a, so closely as does the pelvis of Psaltriparus 
plumbeus, in which species this bone is quite the miniature of 
our subject’s. One point, however, must be noted, and in the 
Psaltriparus the ilia do not come quite in contact on the dorsal 
aspect, as we have stated above to be the case in Chamea. 
Passing to the Crested Tits (Lophophanes), the pelvis still 
bears the same general features, but in it the internal margins 
of the ilia, opposite the acetabule, are yet further separated, and 
the sacrum here upon the dorsal aspect thoroughly exposed, 
in consequence, for its entire length. 
Chickadees and Wrens are in the same case, their pelves 
agreeing very well with the others described, and with the 
sacrum well in sight along its entire dorsal aspect, the ilia not 
meeting each other in any part of that locality. 
Accentor has a very different pelvis from this; and it agrees 
best with that bone in some of our larger Mniotiltide, with a 
trace of the Sparrow in it, and belongs to a bird quite thoroughly 
removed from Chamea. 
Counting the free caudal vertebre in our subject, I find there 
are szx of thent, not including the large pygostyle. This latter 
bone has here rather a peculiar shape, its superior laminar por- 
tion showing near its centre an area where the bone is much 
thinner than at the edges; while below it is somewhat spread 
out, after the fashion of the Pzcz, only in a far less degree. 
Six plus a pygostyle is also the normal complement in Psa/ 
triparus and all other Tits examined, as well as in the Wrens, 
and in Accenzor, and finally in such species as Polioptila plumbea, 
Regulus, and Protonotaria citrea. Let us next take a glance at 
the bones of the shoulder girdle in these several groups of birds ; 
and first, in Chamcea, we find the os furcula to assume the broad 
and deep U-shape pattern, its limbs being reduced to almost ° 
capillary dimensions, with a mere apology below for a hypo- 
cleidium, while the coracoidal ends of the limbs are compara- 
tively very much expanded. A scapula has a long, narrow, thin 
blade, the posterior third of which is turned considerably out- 
wards, and its apex carried to a fine point. Most interesting, 
however, of all three is a coracoid, which here attains to a won- 
derful length, the bone being not a little longer than the greatest 
longitudinal diameter of the body of the sternum (not including 
the manubrium in the measurement). Its shaft is subcylindrical 
