Herpetogramma rudis species-group

Herpetogramma rudis species-group
Jahir has pointed out on Herpetogramma licarsisalis page: bn942, br882, bv558 are of the Herpetogramma rudis group, and I agree. By the Herpetogramma rudis group, I mean Herpetogramma rudis (Warren, 1892), Herpetogramma stultalis (Walker, 1859) and Herpetogramma bipunctalis (Fabricius, 1794), which very difficult to separate reliably from images. I am also uploading more individuals which belong to this species group.
Acharana rudis Warren, 1892. Warren, W. 1892: Descriptions of new genera and species of Pyralidae contained in the British Museum collection. Annals and Magazine of Natural History, including Zoology, Botany and Geology, London (ser. 6) 9: 435. TL: Japan. Text at https://www.biodiversitylibrary.org/page/19268671#page/483/mode/1up
https://www.inaturalist.org/taxa/539064-Herpetogramma-rudis
Lu X-Q., Wan J-P. & X-C Du. 2019. Three new species of Herpetogramma Lederer (Lepidoptera, Crambidae) from China. ZooKeys 865: 67-85. Fig. 5 & 6.

Herpetogramma stultalis (Walker, 1859)
FBI, Hampson, Vol. 4, pg. 405, # 5162 as Pachyzancla stultalis.
Botys stultalis Walker, 1859. List of the specimens of lepidopterous insects in the collection of the British Museum, 18: 669. TL: Ceylon. Text at https://www.biodiversitylibrary.org/item/120189#page/699/mode/1up
https://www.inaturalist.org/taxa/632584-Herpetogramma-stultalis

JD : Agree this must be in the rudis group, but the OD of rudis itself is not very descriptive, & is compared with stultalis
However, the description in Lu et al mentions the pale yellowish line adjoining the post-medial on outside.