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 ; quadrate; 8, foramen for vagus nerve; 9, for the 

 hypoglossal nerve; i. c, for the internal carotid ; q.J, quadrato-juga. , 

 eu, Eustachian tube ; ^:>/, palatine ; vix, maxillary ; v, vomer. 



Plate XVIII. 

 Fig. 7. Pelvis of Ampelis cedromm, 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. Eight 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 Phalanoptilus Nuttalli, X 2. Collected 

 by the author at FortWingate, N. Mexico. Lettering of the parts as 

 on Plate XVII. 



It). 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. Right lateral view of the skull of a specimen of Prognc suhis, $ ; 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 erythrogaster, c?, X 2 ; mandible 

 removed. 



22. Superior view of the skull of Micropus mclanoleucus, J , 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 erythrogaster, (5* , X 2 ; man- 

 dible removed : letters as befoi'e. This is the upj^er 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. 



