MUSEUM OF COMPARATIVE ZOOLOGY. 



801 



CYPSELID^I. 



The chimney swift ( Chcetura pelasgia) arrives about the last week 

 in March. It was common at Jacksonville, April 1st. 



TROCHILID^I. 



The ruby-throated humming-bird (Trochilus colubris) became com- 

 mon about March 1st. Some probably spend the. winter in South 

 Florida. 



V1C1DM. 



69* Campephilus principalis Gray. Ivory-bjt.led Woodpecker. 



Picus principalis Linne, Syst. Nat., I, 173, 1767. 

 Campephilus principalis Gray, Genera of Birds, 1840. 



Campephilus Bairdii Cassin, Proc. Phil. Acad. Nat. Sci., 1863, 322. (West 

 Indian form.) 



Rather rare ; at least far less numerous than most of the other 

 species of woodpecker. 



With only Florida specimens of this species before me, I am unable to 

 give comparisons between them and specimens from other localities. Ac- 

 cording to the late Mr. Cassin, those found in Cuba differ from those of 

 the Southern States, in being smaller, as would be expected, with very 

 slight deviations in color-markings. He has, however, given to the Cuba 

 race the name of Campephilus Bairdii, remarking that it appears to be 

 " one of those singular insular species which have become well known to 

 naturalists." 



Measurements of Florida Specimens of Campephilus principalis. 



seen in other species of our birds. Yet these variations have in the present case been 

 mistaken as indicating numerous species. The southern representatives of it are ap- 

 preciably smaller than the northern, and have the white markings on the wings more 

 restricted, — variations that have already been pointed out in this paper as occurring in 

 numerous others similarly distributed. Those from the central arid region of the con- 

 tinent are also Ughter in general color than those from the eastern or western portions; 

 also a common color variation in other species. The latter type forms the so-called 

 Chordeiles Henryi ; the southern ones have been variously characterized as C. sapid, 

 C texensis, C. Gundlachii, etc., as indicated in the above-cited syuonymes. 



