Jan., 1909. Birds of Illinois and Wisconsin — Cory. 287 



Immature {dark phase ) : General color, slaty brown; neck marked 

 with white; feathers on the belly barred with dull white. The twO' 

 middle tail feathers are rounded at tip, and project more or less be- 

 yond the others and the tarsus is black in freshly killed specimens. 



Length, 20 to 22; wing, 13.25 to 14; bill, 1.40 to 1.65; tarsus, 

 1.40 to 1.50. 



The records for Illinois are not very satisfactory and at most it 

 is a rare straggler on Lake Michigan. Nelson saw one near Chicago 

 in 1876, and was told of another having been seen. (Bull. Essex 

 Inst., Vol. VIII, p. 145, 1877.) For Wisconsin, Kumlien and Hollis- 

 ter state that three were seen on Green Bay in October, 1879, and L. 

 Kumlien secured one on Lake Koshkonong about the same time. 



II. Stercorarius longicaudus Vieill. 

 Long-tailed J^ger. 



Distr.: Northern part of northern hemisphere, breeding in high 

 latitudes; south to Gulf of Mexico in winter. 



Adult: Bill, less than 1.35; cere (the hard skin-like covering on base 

 of upper mandible), shorter than the distance from its anterior end tO' 

 tip of bill; tarsus, blue in freshly killed specimens ; feet, black; above 

 slaty gray; top of head and lores, dull black ; sides of the head and 

 neck, pale yellow; under parts, dark slate color; chest and upper 

 belly, whitish ; middle tail feathers pointed. 



Im.rnature : Resembles the preceding species in color; but differs in 

 length of bill and having the middle tail feathers pointed. 



Length, 19 to 23; wing, 12.50; tail (adult), 12.50, (immature),. 

 6; tarsus, 1.65; bill, i.io. 



Long-tailed Jsger has but a slight claim to be included in the 

 avifauna of Illinois and Wisconsin, although the occurrence of occa- 

 sional stragglers of this species on Lake Michigan is not unlikely. 

 A specimen identified as the Long-tailed Jaeger was picked up dead 

 on the shore of the Mississippi River near Cairo, 111., by Mr. W. H., 

 Ballou, in November, 1876. It was badly decomposed and after being 

 examined by Mr. Ballou and another gentleman, was thrown away. 

 (Ridgway, Orn. of 111., Vol. II, p. 218.) This seems to be the only 

 record for either Illinois or Wisconsin, but Mr. Rudolph M. Anderson 

 records a specimen captured near Lone Tree, Johnson County, Iowa,, 

 in June, 1907. (The Auk, Vol. XXV, 1908, p. 215.) 



Parasitic Jaeger, Stercorarius parasiticus {Linn.). While there is 

 no actual record of the occurrence of this species within our limits, 

 according to Prof. Ridgway, it is of "occasional occurrence on Lake 



