Anatomy &c. of the Colies. 253 
to render it tolerably certain that the birds in which it is 
found must be more or less closely related. 
In the convolutions of the intestines the Colies, as 
Dr. Chalmers Mitchell has shown, undoubtedly agree very 
nearly with the Cypseli, and this in spite of very extensive 
specialization in adaptation to a frugivorous diet. 
So far as the known facts go, there is really little in the 
skeleton of the Colies to connect them with the Cypseli ; 
and a study of nestling skeletons of both groups will 
undoubtedly add to the scanty evidence so far to hand. 
But the Colies are indirectly desmognathous, not directly so 
as 1s commonly stated; nor is the vomer absent, though 
reduced to the merest vestige. 
Inasmuch as the Colies are undoubtedly related to the 
Cypseli, they are also related, though more remotely, to the 
Caprimulgi, sce this last group represents the stock from 
which the two former have descended. 
VI. RerereNnceEs TO PREVIOUS WoRKsS. 
1. Bepparp, F. E.—Structure and Classification of Birds. 1898. 
. Firprincer, M.—Zur vergleich. Anat. des Brustschulturapparat. 
Jenaisch. Zeitschr. f. Naturwiss. v. Theil (Vovel), xxxvi. Bd. 1902. 
. Gapow, H.—Bronn’s Thier-Reich (Végel). Syst. Theil. 
. Gapow, H.—Dictionary of Birds (Newton). 
. Gavow, H.—Deep Plantar Tendons in the Trochilide. Ibis, 1895. 
. Garrop, A. H.—Notes on the Anatomy of the Colies. P.Z.S. 
1876. 
. Huxtey, T. H.—On the Classification of Birds. P. Z.S. 1867. 
. Lucas, F. A.—Deep Plantar Tendons in the Trochilide. Ibis, 1895. 
. Lucas, F. A.—Deep Flexor Tendons of Macropteryzx. Ibis, 1895. 
. Mircueix, P. C.—On the Intestinal Tract of Birds. Trans. Linn. 
Soc., 2nd ser. Zool. vol. viii. 1901. 
11. Muniz, J.—On the Genus Colius, its Structure and Systematic 
Place. Ibis, 1872. 
12. Nirzscu, C. L.—Pterylography. Engl. transl. Ray Soc. 1867. 
13. Pycrarr, W. P.—Some Points in the Anatomy of Acanthidositta 
chloris. Ibis, 1905. 
14. SEEBOHM, H.—Classification of Birds. 1890. 
15. SHARPE, R, B.—A Review of Recent Attempts to classify Birds. 
1891. 
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