1871.] 285 [Grayson. 



" Common on the sea shore of the Marias, as also on the main 

 coast, from whence perhaps it visits this locality." 



CHAKADRIID^. 



47. JEgialitis semipalmatus (Bp.). "Little Plover; Fraile- 

 cillo." 



"I procured one specimen of this bird on the shores of the 

 island." 



ARDEID^E. 



48. Ardea herodias Linn. 



49. Herodias egretta (Gm.). "Garza." 



50. Garzetta candidissima (Gm.). "Garza." 



"The above three species appear to be only accidental or strag- 

 gling visitors to the shores of the Marias. Common on the main 

 land. 



51. iNyctherodius violaceus (Linn.). "Yellow-crowned 

 Night Heron ; Garza." 



"I procured a few specimens of this heron in the Marias, some of 

 which were in adolescent plumage ; this led me to suppose that a few 

 individuals may breed there. I found it in about equal numbers in 

 the Socorro Island. It is a common species upon the main land." 



LABID^. 



62. Haliplana fuliginosa var. erissalis Baird, M. S. "Black- 

 back Tern ; Sooty Tern." 



"Numerous in the vicinity of the Islands of the Tres Marias ; it 

 breeds upon the small island of Isabele, near San Bias. This species 

 is never seen near the main shore, usually keeping far out to sea. I 

 have never met with it in any other locality, but the southern part of 

 the Gulf of California in the neighborhood of the Marias. It ap- 

 pears to be semi-nocturnal. It is a constant resident in the localities 

 above cited." 



This differs from H. fuliginosa in having the under tail coverts 

 tinged with ashy, instead of being pure white, 



"This comprises the list of land birds discovered by me during my 

 comparatively short stay upon the Marias ; doubtless a farther inves- 

 tigation may bring to light other species from this interesting 

 locality. 



"Various species of sea birds common to these latitudes are seen 



