82 IOWA ACADEMY OF SCIENCE Vol. XXV, 1918 



itorides and migrans there is probably no real difference at all. 

 Individuals of excuhitorides were seen in our localit}' as late as 

 December 2. 



45. Carolina Wren. Thryothorus ludovicianns. A year 

 ago the writer published the first record of this species in this 

 region (Proc. Iowa Acad. Sci., XXIV, page 257, 1917). On 

 February 27, 1918, Mr. A. F. Allen saw a bird of this species 

 at Seventeenth street and Summit avenue. On March 1 the 

 writer went with Mr. Allen to this spot. "We had not gone half 

 a block from the street car before we heard the loud, full not^ 

 of a bird wholly unfamiliar to me. Although I have seen the 

 bird in Missouri, I had never heard the song until this time. 

 We soon located the bird in the top of a tall cottonwood tree. 

 two blocks from where we had first heard it. ]\Ir. Allen told 

 me that he had heard the song at a much greater distance than 

 this. The song which we thus heard, if converted into words, 

 would sound something like this: 



Cher-wit, cher-wit, cher-wit, cher-ivit, 



the last "wit" syllable being cut oft' very abruptly and emphat- 

 ically. The bird kept up this singing (at about 7:30 a. m.) 

 continuously as long as we were there, w'hich was probably 

 twenty minutes. During this time he sat very erect, somewliat 

 after the manner of the Cardinal, to whose song, also, there was 

 a slight reseanblance in tone and carrying power. In my brief 

 acquaintance with the species in ^Missouri it was prone to fre- 

 quent the brush piles and tangled tree roots exposed by eroding 

 streams, etc. However, ]\Ir. Allen informed me that at other 

 times he saw this particular bird down in a small plum tree 

 thicket not far from the cottonwood tree. Except for this 

 thicket the locality was quite open and clear. ]\Ir. Allen saw 

 or heard the bird several times later (last time reported to me 

 wasi Maroh 21) as he passed the place on his way to his office. 

 On the occasion Avhen we were there together the bird gave sev- 

 eral variations from the song noted above, but I did not attempt 

 to record them. We did not think the identification could have 

 been any more satisfactory with the bird in hand. Besides the 

 (''eseription given above, it may be added that we saw clearly the 

 white supereiliai'v line, and the ciiinanioii-eolored ha-'k and tail. 



