moth genitalia
Ductus bursae entirely composed of the chitinous half collar which takes the shape of two long, parallel cylinders which merge on the ventral side into a broad trough of chitin, bending down the right side of the bursa to nearly its middle; from the apex of this trough arises the thin, membranous ductus seminalis, curving ventrad and caudad from its extreme right edge. Caudad to this ductus is a large patch of small spines, and the left edge of the trough is also provided with a series of longer spines in its proximal region. Except for a narrow membranous area on the left proximal side the remainder of the oval bursa is covered with strong spines. On the dorsal side the initial chitinous area leading to the ductus seminalis is heavily striate. (McDunnough, 1949)