1876.] OF PASSERINE BIRDS. 511 



the humerus a free fasciculus exactly like that above described in 

 the Passeres, except that from about the middle of its lower margin 

 a thin slip runs downwards and wristwards to the fascia of the ulnar 

 side of the outer surface of the forearm. This is represented in 

 Plate L. fig. 1. 



In the Meropidse, as represented by Merops apiaster and M. 

 ornatus, the only difference from the Galbulidse is that the distal 

 branch is more clearly differentiated, and the slip to the ulnar side 

 of the forearm is nearer the angular bend. This arrangement is 

 represented in Plate XLVIII. fig. 3. In Todus viridis the tendons 

 are similarly disposed. 



In the Coraciidse. as represented by Goracias garrula and a species 

 of Eurystomus which was not in sufficiently good condition to be 

 more definitely determined, Plate XLIX. fig. 1 represents the dis- 

 tribution of the tendons, there being two parallel to one another, 

 the anterior one of which runs to the superficial ulnar fascia before 

 terminating, and sends wristwards a slip, like that in the Meropidae, 

 to the long extensor. There is a Passeriform free tendon running 

 back to the lower end of the humerus from the outer tendon. 



In the MomotidiE the condition is the same, except that the outer 

 tendon does not split, and therefore sends forward no wristward slip. 

 This condition I have found in Momotus lessoni, iu M. cequatorialis, 

 and in Eumomota super ciliaris. The extension onto the ulnar 

 superficial fascia springs from the portion of the horizontal tendon 

 intermediate between the points of junction of the two parallel long 

 tendons, and is not a direct continuation of either. It is frequently 

 very thin. 



In the Trogonidae, as exemplified by Trogon mexicana, T. puella, 

 and Pharomacrus mocinno, the condition is very complicated. It is 

 seen in Plate LI. fig. 3. A superficial long muscular mass runs 

 nearly to the long extensor of the forearm. It has a short broad 

 tendinous insertion into the fascia of the outer surface of the forearm ; 

 and this is specially developed in a line running back to the humerus 

 in a Passeriform manner v Deep of this are two parallel tendons : 

 the one nearer the humerus terminates exactly like the single one of 

 the Passeres ; that further off ends as in the Pici above described. 



In the Caprimulgidae, as found in Caprimulgus europceus and 

 Ckordeiles texensis the arrangement is almost exactly the same as 

 in the Meropidae. The second outer tendon, however, is shorter. 



In the Macrochires, including the Trochilidae and the Cypselidae, 

 as found in many genera and species the arrangement is uniform. 

 The fleshy belly runs on to a special tendon which springs from the 

 lower end of the outer surface of the humerus (where the horizontal 

 slip in the Passeres terminates), and is continued, parallel to the 

 forearm, along the radial margin to the hand. Plate LI. fig. 1 

 exhibits this condition. It can be here seen that the tendon of the 

 tensor patagii brevis is not developed, being replaced by the fleshy 

 continuation of the muscle. 



In Upupa epops the arrangement is fairly simple. The main 

 tendon runs past the free lateral margin of the long extensor to the 



34* 



