LIST AND DESCRIPTION 123 
song is incessant. The rather unattractive warble has been de- 
scribed as “you see it—you know it—do you hear me,—do you 
believe it?” 
627. WarsLinc VirEo (Vireosylva gilva gilva.) 
This is our most delightful Vireo. An inhabitant of the 
high tree top and seldom seen, but heard almost any hour of the 
day. Its song is a pleasing and all but incessant warble. No day 
is too hot, even at the noon hour, to discourage its melody. 
Similar to No. 624 but lacks the gray crown with black 
margin. 
627a. WESTERN WaRBLING ViREO (Vireosylva gilva swainsoni.) 
This subspecies strays east to the western part of our 
State. It is similar to the preceding but slightly smaller and 
grayer. 
629. BLUusE-HEADED ViREO (Lanivireo solitarius solitarius.) 
“A rare spring migrant” (Visher, for Clay County). Also 
reported as common in migration for Iowa. 
629b. PLUMBEOUS VIREO (Lanivireo solitarius plumbeus.) 
Reported by Chapman as “breeding in southwestern Da- 
kota.” 
633. BeELu’s Vireo (Vireo belli belli.) 
This “Greenlet” is a lover of tall underbrush and may be 
found among the dogwood bushes of our river bottoms, in the 
stunted growth of many tree claims, or wherever tall bushes are 
to be found. It keeps well away from the observer, but its wav- 
ering and rather unmusical song is unmistakable. 
FAMILY MNIOTILTIDA. WARBLERS 
The Warbler family of the Western Hemisphere com- 
prises about 140 species of small, beautifully colored birds, most 
of them about the size of the Canary, Forty or fifty of the 
species visit the United States, and most of them are migratory. 
The Warblers are insect eating birds, and their migrations are 
closely connected with this fact. They are nearly the last of the 
whole bird procession to come north in spring. They arrive in 
