|Sympetrum croceolum (Selys, 1883),
the Yellow Dater, is a dragonfly of the genus Sympetrum. This is a medium
sized Darter with length around 43mm, wingspan 70mm. The species mainly
occurred in Northeast China, Korea and Japan. In China, it is major occurred
in Northeast provinces, Fujian, Jiangxi, Guangxi, Beijing etc.
The immature individual is fully
orange yellow. Especially, the region from the bottom part of the wing
to the sclerotome area is clear yellow. This yellow light becomes narrow
from the center and finally, can be found at the upper surface of the wing
tip. The rest of the wing lightens its yellow color and becomes transparent,
milky white. The color of the mature individual is not very different from
the immature individual. The only difference is degree of red at the lower
area of the wing and the ventral segment.
Flight period from June to December,
they appear about a month later than the Sympetrum uniforme. The habitat
and period of appearance of these kind of similar speciess differ in order
to separate from each other in time and space.