504 General Notes. [oc t k 



and follows a winding path parallel to the new one for a distance of about a 

 mile. At the point where they reunite, the river flows out into large sloughs, 

 losing all semblance of its usual appearance, and affording a favorite feeding 

 ground for herons. In the tall elm trees between " Lost River " and the 

 main channel there is a heronry of at least twenty pairs of Great Blue 

 Herons. This place resembles in all respects though on a smaller scale, 

 the river bottoms of the Mississippi in southeastern Minnesota where the 

 Prothonotary Warbler occurs so abundantly. Even a slight rise in the 

 river will drench it with a foot of water in many places and at all times there 

 is a network of muddy streams to be forded by the intruder. Here we find 

 old decayed stumps, logs and fallen trees which often give natural bridges 

 across the streams. In such a place it was small wonder that the Prothono- 

 tary was found breeding, and its clear ringing song associated with that of 

 many Redstarts, was a familiar sound there. I found at least five pairs 

 though there may have been more and also located a nest on June 17, 

 1915, with three eggs. The most northern point at which they had been 

 found hitherto was four miles below Hastings on the Mississippi: about 

 sixty miles further south. 1 Therefore the birds here form an isolated colony. 



8. Vermivora chrysoptera. Golden-winged Warbler. — A fairly 

 common summer resident, May 11-September 25. Isanti County seems 

 to lie near the northern limit of their range. They frequent hot, open 

 second growth where hazelnuts grow in abundance. 



9. Vermivora celata celata. Orange-crowned Warbler. — The 

 breeding range of this species is supposed to reach only as far south as 

 Manitoba. I was greatly surprised, therefore, to find one singing in the 

 willows and alders bordering the sloughs at the mouth of " Lost River " 

 on June 11, 1915. It was very confiding so that I could approach quite 

 close to it while it was singing and could plainly see the obscure streaks 

 on the breast; as it was preening its plumage the brownish bases to the 

 feathers on the crown could even be seen. I am thoroughly familiar with 

 the Nashville, Orange-crowned and Tennessee Warblers and their songs 

 so I have no doubt that it was the Orange-crown although the specimen 

 was not collected. It seems probable that it was breeding there, though 

 of that I am not certain. 



10. Dendroica vigorsi. Pine Warbler. — Very common in the 

 pines in the northern parts of the county. Often only two or three large 

 pines near farmhouses will shelter a pair of them. 



11. Oporornis agilis. Connecticut Warbler. — Summer resident, 

 May 18-? This interesting species was found to be common in summer 

 in the tamarack and spruce bogs where its loud, liquid song was a dominant 

 sound in the morning and evening hours. In the middle of the day they 

 are much less in evidence since they are then preoccupied in walking about 

 in the damp moss and undergrowth searching for insects. They display 



i Roberts, T. S. Auk, Vol. XVI, No. 3, July 1899, pp. 236-246. 



