Dr. J. Marie on the Motmots and their Affinities. 387 



The sternum is short and broad, with two pairs of oval per- 

 forations. In the specimen examined by me the innermost on 

 the left side was reduced to a couple of small foramina. Pec- 

 toral plates flattish, and, so far as can be judged, inclining to a 

 chevron-shape. Keel deep forwards, and well produced in a 

 ploughshare, with shallow middle emarginations. Costal process 

 strong, long, and with four costal facets. Rostrum acuminate, 

 length moderately upturned and interiorly excavated. 



Coracoid 1*05 inch, the oblique sternal diameter 0*8 inch, 

 scapula 1'2 inch, and furcula 0''J inch long. 



The furcula has no descending process or interclavicle. It 

 has a wide inferior arch, where the bones are very slender ; supe- 

 riorly they are stouter, but have no special expansion. Shaft of 

 coracoid flat, and epicoracoid extension moderate ; the head of 

 the shaft presents little enlargement ; acromion absent. Sca- 

 pula pretty straight, or with only a light curve to the broadish 

 terminal end. 



II. Cranium ^c. of Momotus brasiliensis. 



This species I have not had an opportunity of examining ; but 

 Mr. Eyton ^ makes a few remarks upon it, which I need not 

 quote, as they agree well with what has been said of M. lessoni. 

 He observes, the head presents some likeness to that of Coracias 

 garrula. His outline of the postpalatals of M. brasiliensis f 

 appears a perfect counterpart of the same region of M. [Banj- 

 phthengus) ruficapillus, a diminutive rod-like vomer being repre- 

 sented. 



Of measurements, he gives head 2*8 inch long, breadth 1*2, 

 humerus 1'6, ulna \7, metacarpus 0'7, tibia 1-8, and metat- 

 arus in length 1*2. Save ulna, these closely correspond with 

 the measurement of M. [B.) ruficapillus. 



III. Osteology of Momotus (Baryphthengus) ruficapillus. 



Levaillant % figured a species of Motmot under the name of 

 "Le Motmot domb6," to which Vieillot § gave the name of 



* Osteologia Avium, p. 59. t PI- xii. fig. 12. 



X Ois. de Par. i. p. 11.3, pi. .39. 



§ Nouv. Diet. d'Hist. Nat. t. xxi. p. 258. 



