394 
MORPHOLOGICAL STUDIES OP THE MACROCHIRES. 
Plate XXII. 
Pig. 24. Right lateral view of the skull of Micropus melanoleucus, J ; X 2. 
Lettering of parts as before. This is the same specimen from which 
I drew the basal view in a former memoir on the Macrochires (P. Z. S. 
1885, p. 899, fig. D). 
25. Right lateral view ( X 2) of the skull of Tachycineta thalassina, f . 
Lettering of parts as before. 
26. Superior view ( X 2) of the skull of Tachycineta thalassina, S', mandible 
removed. This figure and figure 25 refer to the same specimen from 
which I drew the figure in my former memoir (P. Z. S. 1885, p. 899, 
fig. F). 
27. Right lateral view of the skull and mandible of Trochilus rufus, adult 
S ; X 4. Same lettering as before. 
28. Outer aspect of the muscles of the right arm in Trochilus platycercus. 
Very much enlarged, t, triceps; tp. b, tensor patagii brevis; tp.l, 
tensor patagii longus ; e. rn. r. I, extensor metacarpi radialis longus ; 
tn, a tendon to the tensor patagii brevis. 
29. Outer aspect of the muscles of the right arm in Chcetura pelagica. 
Enlarged rather more than twice. Lettering same as in fig. 28. 
This figure and the last were drawn by the author directly from his 
own dissections. 
Plate XXIII. 
Fig. 30. Ventral aspect of the pelvis of Micropus onclanoleucus , X 2. 
31. Ventral aspect of the pelvis of Trochilus rufus, X 34. 
32. Right lateral view, life-size, of a day-or-two-old nestling of Trochilus 
Calliope. 
33. Anterior aspect of the trachea of Trochilus rufus, X 4^. 
34. Digestive tract of Trochilus platycercus, X 2J. 
35. Anterior aspect of Trochilus Calliope, adult, with the chest-wall and 
other parts removed to show the relative size and position of organs. 
1. c, left carotid ; H, heart ; r. I, right lobe of liver ; l. I, left lobe of 
liver. X 2|. 
36. Same view and similar dissection of Micropus melanoleucus. S, 
stomach, with other lettering as in figure 35. Somewhat enlarged. 
Plate XXIV. 
Fig. 37. Left lateral view of a plucked specimen of Micropus melanoleucus. 
38. The same of Chcetura pelagica. 
39. The same of Trochilus platycercus. 
These are all life-size figures of male birds obtained by careful contour traces 
directly from the bodies of the specimens, and are not intended to show any 
part of the pterylography. 
