The uropygium also, which in the European bird is entirely white, is in our specimen partially variegated with black.
In some of the families the uropygium is recorded as small in suspiciously close to 25 per cent of the offspring.
The tail length, however, is measured from the base of the uropygium to the tip of the longest pair of rectrices.
Seaside Sparrows have a mid-dorsal row of downs in the dorsal tract near the uropygium.
uropygium: the ovipositor when it is a mere extension of the abdominal segments.