MUSEUM OF COMPARATIVE ZOOLOGY. 



367 



Females: Length, 13.10 to 15.50 ; alar extent, 28.20 to 32.00 ; wing, 9.90 

 to 11.50 ; tail, 5.20 (4.75?) to 6.11 ; bill (culmen), 1.25 to 1.55 ; tarsus .70 

 to .90. 



Measurements of Massachusetts Specimens of Sterna hirundo, 

 Taken in the Breeding Season. 



