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DR. E. W. SHTTFELDt's MORPHOLOGHCAL 



particular, I am inclined to believe that the order Teochili will 

 be found to be an unusually well-circumscribed one, containing 

 upwards of 500 species, to represent it. 



Since completing the main part of this paper, and especially 

 since closing the list of acknowledgments at its commencement, 

 I liave received many kind letters relative to the work from 

 fellow labourers in the same fields, and in some cases valuable 

 material for comparison. 



Chief among these it gives me great pleasure to thank Professor 

 W. K. Parker, P.R.S., for many timely hints upon avian rela- 

 tionships, and for his ready encouragement of my work during 

 the time it has been in progress. I am grateful, too, to Sir 

 Edward Newton, C.M.Gr., formerly of the Colonial Office, of 

 Kingston, Jamaica, for his efforts to secure me specimens of 

 Hemiprogne zonatus ; to Lieut. Edgar A. Mearns, of the 

 Medical Corps of the United States Army, for specimens of 

 Humming-birds from Arizona ; to Mr. Eobert Eidgway for 

 having directed that the entire collection of birds in alcohol at 

 the Smithsonian Institution should be gone over with tlie view 

 of filling up gaps in my desiderata, although at that time it was 

 found that no specimens in alcohol of the Macrocbires were in 

 the collections of that Institution ; and finally, to Mr. E. Stephens, 

 of San Bernardino, California, for the loan of many valuable sterna 

 of American Trochili, from his private collections. 



EXPLANATION OP THE PLATES. 

 (All the figures in the Plates were drawn by the Author from the specimens.) 



Plate XVII. 

 The pterylosis of Ampelis cedrorum. 



Fig. 1. a. Ventral aspect, h. Dorsal aspect. Considerably reduced. 



2. Muscles of the patagium of the right wing in Ampelis cedrorum, seen 



upon the outer aspect, and X 2. tp. I, tensor patagii longus ; tp. h, 

 tensor patagii brevis ; dt. p, dermo-tensor patagii ; d, deltoid ; t, 

 triceps ; b, biceps ; e. m. r. I, extensor metacarpi radialis longus ; h, 

 humerus; u, ulna. 



3. Eight lateral view of the skull of Tyrannus verticalis, life-size. 



I, the free lacrymal bone. 



4. Same view of the skull of Ampelis cedrorum, S; life-size: letters the 



same. 



5. Same view of the skull of Hespcrocichla natvia, cJ; life-size. 



