26 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY 
Sterna antillarum (Less.). 
Least TERN. 
The Qeast Tern also, if Iam not mistaken, is now reported for the first 
time from Lower California, where, however, its presence is not surprising since 
it breeds abundantly on the coast of California as far northward, at least, as 
Los Angeles county, while it ranges southward along the western coast of 
Central America. 
Mr. Frazar found it only at San José del Cabo, where, between September 6 
and 12, six specimens, including both young and old birds in autumn plumage, 
were taken. He speaks of it in his notes as “not common, but yet more 
numerous than any of the other Terns observed at San José.” 
Hydrochelidon nigra surinamensis (GMEL.). 
Biack TERN. 
This is the fourth species of Tern which Mr. Frazar has added to the fauna 
of Lower California. Like the other three, it was seen only at San José del 
Cabo, where it was “rare.” A specimen was taken on the 6th and another 
on the 17th of September. 
The Black Tern was found by Mr. Grayson “at Mazatlan, where it makes 
its appearance in September and October, and where it remains through the 
winter months.” Dr. Cooper states that it “migrates through the interior 
valleys of California, and that some probably breed about the marshes within 
the State, especially in the mountains, as he met with it on the head-waters 
of the Mohave River as late as the 7th of June.”1 Hence it is possible that 
Lower California lies nearly in the direct path of one of its regular lines of 
migration. 
Puffinus opisthomelas Coves. 
BLACK-VENTED SHEARWATER. 
Puffinus opisthomelas Cours, Proc. Acad. Nat. Sci. Phila., 1864, 139-141 (orig. descr. ; 
types from Cape St. Lucas). Extrot, Illustr. New and Unfig. N. Amer. Birds, 
II. 1869, introd. (descr.; figures head of specimen from Cape St. Lucas). 
P.[uffinus] opisthomelas Cours, Loc. cit., 144 (descr.; Cape St. Lucas). 
Puffinus gavia (not Procellaria gavia Forster) Bryant, Proc. Calif., Acad. Sci., 
2d ser., II. 1889, 87 (Cape St. Lucas). 
“A large number of medium-sized, white-breasted and dark-backed Shear- 
waters,” seen by Mr. Frazar between the islands of Carmen and Montserrat on 
March 6, and a few off the northern end of Espiritu Santo Island on March 18, 
1 Baird, Brewer, and Ridgway, Water Birds N. Amer. II. 1884, 821. 
