Warbler Flight in Missouri Valley 199 



Plcmesticns migratorius popinqims.- — Western Robin. 



Only a few were seen in town during our stay. They were sit- 

 ting quietly in the trees. 

 SiaMOi currtiooides. — Mountain Bluebird. 



A roving flock seen February 19. Irregular winter visitant. 



AN UNUSUAL FLIGHT OF WARBLERS IN THE 

 MISSOURI VALLEY. 



BY T. C. STEPHENS 



An especially interesting flight of warblers was noted at 

 Sioux City during the spring of 1913. The wave apparent- 

 ly first reached this point on May 8, but was more marked 

 on the 9th and reached its maximum on the 14th and 15th. 

 My records show that there had been a good deal of rain and 

 cloudy weather prior to the arrival of the wave. May 3 was 

 mostly cloudy, and was followed by three clear days. May 

 7 was cloudy and rainy; the 8th and 9th were cloudy and 

 cold with some rain. On the 10th it cleared up but was still 

 cool. By the 13th it was still clear, but was cloudy again on 

 the 14th and 15th with rain both nights. An analysis of the 

 weather conditions cannot be further attempted for more 

 complete data covering a greater extent of the Missouri val- 

 ley would be required to reach any significant facts. It will 

 be noticed, however, that the warblers were present in con- 

 siderable numbers during both clear and cloudy or cool 

 weather. 



The records when arranged as in the accompanying table 

 show at a glance the wave as it came under the writer's ob- 

 servation. To many it may seem quite meager, but nothing 

 like it has been witnessed by the writer in the five years of 

 his observations at this point. The abundance of these small 

 birds with bright colors attracted the attention of many peo- 

 ple who were not accustomed to notice birds. Some more or 

 less regular migrants of other years are singularly absent 

 from the list, viz, the Palm Warbler, and the Mourning 

 Warbler. The list is made up of records on both sides of 



