LONGIPENNES GAVLE LARID.E. 109 



237. (217.) Sterna hirundo Linn. (S. wiluoni of tho original edition.) Common 

 Tern, or Sea Swallow. 



An occasional visitor during the late summer and early fall months. 



[797] 



Fig. 9D Tern. 



238. ( — .) Sterna forsteri Xu tt. Forster's Tern. 



In the original edition we indicated this species as one "undoubtedly 

 to be found in the District." It has since been properly added to the 

 list by Mr. Jouy, having been actually taken within our limits. [798] 



239. (218.) Sterna superciliaris antillarum (Less.) Coues. (S. frenata of the origi- 



nal edition.) Least Tern. 



Not uncommon; frequently seen over the marshes of the rivers in 

 August and September, and more seldom in the spring. [^01] 



240. (219.) Hydrochelidon lariformis (Linn.) Coues. (H. plumbea of the original 



edition.) Short-tailed Tern. 



Less numerous than the preceding, but found under similar circum- 

 stances at the same seasons. [806] 



241. (220.) Rhynchops nigra Linn. Black Skimmer. 



A rare straggler, late in the summer or in the beginning of September. 

 Individuals were once seen by ourselves on the Potomac, some distance 

 below Washington, September 8, 1858, since which occasion we have 

 heard nothing more of the bird. [809] 



Suborder TUBINARES : Tube-nosed Birds. 

 Family PKOCELLARIID JE : Petrels. 



Birds of this pelagic family are all necessarily stragglers inland. 

 Three have been known to occur in the District. 

 242. (210.) Cymochorea leucorrhoa (Vieill.) Coues. Leach's Petrel. 



Accidental straggler. Numbers were seen during a storm many years 

 ago. [823] 



