1890.] NATURAL SCIENCES OF PHILADELPHIA. 207 



46. Trochilus colubris Linn. Ruby-throateil Huminin^^binl. 



Common at Shkolak, March 5th, at Labna, March 15th and at 

 Progreso on the sand hills, March 19th. 



47. Lampornis prevosti (Less.). Prevost's Hummingbird. 



A fine male shot on the road from Ticul to Uxmal at the eastern 

 base of the hills, March 13th. Also seen at Labna. 



48. Amazilia cinnamonea (Less.). Cinnamon Hummingbird. 

 Rather common, seen at Tekanto, Sitilpech and Ticul. 



49. Amazilia yucatanensis (Cabot). Cabot's Hummingbird. 



A few males shot at Labna, March 14th. 



50. Tyrannus melancholicus Vieill. Mexican Kingbird. 



This is probably the commonest of all the flycatchers found 

 in northern Yucatan. It was seen throughout the interior especi- 

 ally about the haciendas. In the scrubby growth on the sandhills at 

 Progreso we found a Tyrannus which at first sight seemed different 

 but is probably identical with this species. It seemed to differ consid- 

 erably in its habits from the bird of the interior, being much more 

 quiet. Only one specimen Avas collected in the interior and it is 

 hardly right to take this as typical o£ all the inland birds, but com- 

 paring the three Progreso specimens with this, I find them much 

 lighter yellow beneath, with a wider and more prominent grayish- 

 olive band across the breast. The back is nearly uniform gray 

 while it is very strongly tinged with olive in the inland bird. The 

 crest of the coast bird contains much less red than the inland 

 specimen and the under tail coverts are spotted with brown. 



51. Pitangus derbianus (Kaup). Derby Flycatcher. 



One specimen shot at Tunkas, March 3rd. No others seen. 



52. Megarhynchus pitangua (Linn.). 



Specimens procured in the forest near Shkolak and also near 

 Tekanto. 



53. Myiozetetes texensis (Giraud). Giraud'.s Flycatcher. 



Very common throughout the interior, especially about the hacien- 

 das and at the aguadas at Shkolak. These birds have a shrill 

 cry and keep up a continuous noise. 



54. Oncostoma cinereigulare Scl. 



Apparently rare ; only one specimen was seen which was shot near 

 Tekanto, February 26th. 



