STUDIES OF THE MACROCHIRES. 
393 
Fig. 6. Under view of the skull of Ampelis cedrorum, <$ ; X 2. pmx, pre- 
maxillary ; mx. p, maxillo-palatine ; pp. pars plana ; pt, pterygoid ; 
ju, jugal; q, quadrate; 8, foramen for vagus nerve; 9, for the 
hypoglossal nerve; i. c, for the internal carotid; q.j, quadrato-juga^. , 
eu, Eustachian tube ; pi, palatine ; mx, maxillary ; v, vomer. 
Plate XVIII. 
Fig. 7. Pelvis of Ampelis cedrorum, X 2 ; dorsal aspect. 
8. Basal view of the skull of Trogon mexicanus, X 2 ; the mandible re- 
moved. Lettering as in the preceding Plates, with n. s, nasal septum ; 
* calls attention to the basipterygoid process of the right side. 
9. Anterior aspect of the body of Antrostomus vociferus, to show the 
pterylosis. Somewhat reduced. 
10. The same, shown from behind. 
Plate XIX. 
Fig. 11. Superior aspect of the skull of Trogon mexicanus ; life-size, with 
mandible removed. 
12. Ventral or anterior aspect of the sternum of the same species ; life- 
size. 
13. Bight lateral view of the skeleton of the same; life-size, with the ribs 
of the left side removed. 
14. Dorsal aspect of the pelvis of the same ; natural size. 
Plate XX. 
Fig. 15. Left lateral view of the skull of Phalcenoptilus Nuttalli, X 2. Collected 
by the author at Fort Wingate, N. Mexico. Lettering of the parts as 
on Plate XVII. 
lb. The same skull seen from above, X 2 ; mandible removed. 
17. The same skull viewed upon its basal aspect ; mandible removed ; X 2. 
Plate XXI. 
Fig. 18. Bight lateral view of the skidl of a specimen of Progne subis, § ; X 2. 
Lettering of the parts as before. 
19. The same skull seen from above, X 2 ; mandible removed. 
20. The same skull viewed upon basal aspect, X 2 ; mandible removed. 
21. Basal aspect of the skull of Chelidon erythrog aster, , x 2 ; mandible 
removed. 
22. Superior view of the skull of Micropus melanoleucus, x 2; man- 
dible removed : and letters as before. This drawing is made from 
the same skull as the one from which I drew the basal view in a 
former memoir on the Macrochires (P. Z. S. 1885, p. 899, fig. D). 
23. Superior view of the skull of Chelidon erythrog aster, d, X 2; man- 
dible removed : letters as before. This is the upper view of the skull 
shown in figure 21 ; and x directs attention to the thinning of the bone 
in the triangular area on either side, between the nasal, frontal, and 
premaxillary ; in the Swift (fig. 22) this entire triangular area becomes 
completely perforate. 
