Anatomy &c. of the Colies. 239 
In Acanthidositta—one of the “Tracheophone”’ Passeres 
—the pars longa has separate furcular and scapular heads 
as I have recently shown elsewhere (13), and it is evident 
that the heads have been derived by the splitting-up of an 
origin, such as that seen in Colius. 
Besides the Hornbills and the Macrochires, the Colies are, 
as Mr. Beddard has remarked, the only flying-birds in which 
the latissimus dorsi metapatagialis is absent. 
The syrinex is of the typical tracheo-bronchial type. 
Text-fig. 16, 
Wing-muscles of Colus, to shew tie confluent condition of the 
pars longa and brevis of the deltoides major. 
d.m.b. =deltoides major pars brevis. a.=anconeus., 
d.m.l.=deltoides major pars longus. h.= humerus. 
d.p.b.=deltoideus propatagialis brevis. 
In the matter of the intestinal tract, Dr. Chalmers Mitchell 
(10) has shown that the Colies stand alone in the extreme 
shortness of the gut and the great width of its lumen—a 
modification which he attributes to the frugivorous habits of 
these birds. The duodenum is of great width. Meckel’s 
tract similarly forms but a simple loop, bearing a small 
diverticulum ; while the rectum is short and wide. The ceca 
are altogether wanting. 
In the generai conformation of the tract, Colius, as 
Dr. Mitchell shews, closely agrees with the Cypseli, both 
being apocentricities of the archicentric Caprimulgine type. 
