EARLY JUNE—OUR LAST EXCURSION 141 
points are visible when they cling to the eaves 
or perhaps when perching on the road—the 
latter an uncommon occurrence for these birds. 
If a side view of the house-martin be obtained, 
PratE XL: Fledgling house-martin, showing the 
white patch on the lower half of the back (% size). 
the bird appears half white and, half, black, 
the black parts being the upper half of the 
head and the wings. The photograph of the 
house-martin is that of a fledgling I found 
