TIIK CONDOR 
Vol. XlV 
12f, 
a demonstration. Of the four cg'g's, one was quite fresh, and the other three were 
in various stag-es of incubation. 
On several occasions we noted the peculiar “nuptial gyrations” in the air. 
which have been graphically described by some writers. 
UI-]MAUKS UPON THE OCCURRENCE OF SEVERAL SPECIES OF LIMTCOLAE 
W. W. Cooke in the ‘Third Supplement to the Birds of Colorado' (Auk. 
xxvi, 1909, 411), in speaking of the We,stern Solitary Sandpiper says: “The 
early publications on Colorado Ornithology included this species among the breed- 
ing" birds of the state, and the same reference has been continued by subsequent 
writers. As neither eggs nor young birds have ever been reported from the state 
the assum])tion of breeding" rests on the ])resence of the birds in pairs during the 
summer season. Late investigatiotis have shown that many non-t)reeding Solitary 
Fig 52. NEST AND EGGS OF WILSON SNIPE 
Sandpipers remain through the summer far south of the breeding grounds, and 
also that the southward migration of breeding birds begins soon after the first of 
July. In the light of these facts it must be considered that, though the species 
probably does breed in Colorado, yet the actual breeding is not yet proven." 
While this statement was written over a year after the last of our w'ork at 
Barr it confirmed our observations .so thoroughly and applied so well to several 
species beside the one it referred to, that it has been copied verbatim. The most 
puzzling problem which confronted us was the .status of the several species of 
Sandpii)ers and other waders, whose breeding ground was generally supposed to 
be in the far north, which yet were (juite common at Barr during at lea.st a portion 
of the breeding season. The closest attention was given these species, and much 
time w'as spent in an effort to definitely establish some of them as breeders, yet 
