JAEGERS 39 



Order LONGIPENNES. Long-winged Swimmers. 



Family STERCORARIID^. Skuas and Jaegers. 



Genus STERCORARIUS Brisson. 



Key to the species of STERCORARIUS. 



A. Wing more than 13.50 ; culmen 1.40 or more ; tarsus more than 1.90 ; 



middle tail feathers not pointed. Pomarine Jaeger. 



B. Wing less than 13.50 ; culmen less than 1.40; tarsus less than 1.90; 



tail feathers pointed. 

 * Distance from end of shield on bill to tip of bill less than length 

 of shield itself ; length of tail in adults always less than 8.75. 

 Parasitic Jaeger. 

 ** Distance from end of shield on bill to tip of bill greater than 

 length of shield itself ; length of tail in adults greater than 8.75. 

 Long-tailed Jaeger. 



36. Sfercorarius pomarinus (Temm.^. Pomarine Jaeger. 



Plumage in adults: upper parts sooty slate in light phase, and dark 

 plumbeous or sooty slate in dark phase ; neck and lower parts white, tail 

 coverts slaty in light phase, and same parts like upper parts in dark phase. 

 Immature plumage : sooty slate more or less barred with buff below. Wing 

 13.50 to 15.00 ; culmen 1.40 to 1.80 ; tarsus 2.05 ; tail in adults 8.50 and in 

 young 5.50. 



Geog. Dist. — Summer resident of latitudes within the Arctic Circle, in 

 winter ranging southward to Africa, Australia and nearly if not quite to 

 South America. 



County Records. — Cumberland ; have received many in spring and fall, 

 (Lord). Kennebec ; one taken near Waterville is in the collection of Prof. 

 A. L. Lane, (J. M. O. S. 1899, p. 11). Knox; have seen it in summer, (Nor- 

 ton). Lincoln; three seen June 23 and again June 24, 1895, (Norton). 

 Sagadahoc; (Spinney). Washington; not common, (Boardman). York; I 

 have a specimen from the town of York, (Norton). 



Of rather general occurrence along the coast from August to 

 late October and again in May, while it is casual through 

 the summer, but never breeding within our limits. It winters 

 from Long Island southward. Mr Turner says (Cf. Turner 

 Contributions to the Natural History of Alaska, p. 122) "The 

 Pomarine Jaeger arrives at Saint Michael's by the first week 

 in June, or it may arrive by the 23rd of May if the season is 



