336 



JiET AND DESCRIPTION 



feathers of this and the next species are pointed. The best 

 method of distinguishing this species from the last is by the 

 difference in size and the acute instead of rounded ends to 



the central tail feathers. 

 To separate it from the next 

 compare the length of the 

 horny covering to the nos- 

 trils, with that of the top of 

 bill or culmen ; in lliis species it is always more than half; 

 in the next, less than half. In the adult, the length of tail 

 enables one to separate them. 



Length, 18; wing, 12^ (11|-13J); tail, 5 (young), 8.^ (adult) ; tarsus, 

 1^ ; culmen, \\. Northern regions; breeding in high latitude.s, and win- 

 tering in America from New York and Cali- 

 fornia to South America. Migrates through the 

 Lake retrion as well as along the coa.sts. 



4. Long-tailed Jaeger (.SS. StercoriXrins 

 longicaiklus). — This is another bird like 



the last two, having the same coloring and * ' 



occurring in the light and dark pliases. In the mature birds 

 of this species, the central tail feathers are much longer. 



This bird, as stated 

 above, has the horny 

 cere which covers 

 the nostrils less than 

 half as long as the 

 culmen. In young 

 birds before the full 

 length of the tail is 

 attained, the .si)ecies 

 can be distinguished 

 See the illustra- 



Longtailed Jaeger 



only by noting the length of the cere 

 tion. 



Length, 22; wing, 12^ (lU-13); tail, G (young), 11-15 (adult); tar- 

 sus, 1|; culmen, 1^. Northern regions; breeding in high latitudes, and 

 migrating mainly along the coasts to the Gulf of Mexico and the West 

 Indies. 



