Blandicinae Burr, 1915
3 genera
7 species
South Africa & Madagascar
Type: Blandex: Blandex solvendus – Typus in Museum of Natural History Vienna, Austria

Alloblandex Hincks, 1957
-> Alloblandex granulatus Hincks, 1957 – Cape Province
Blandex Burr, 1912
-> Blandex africanus Steinmann, 1974 – Transvaal
-> Blandex betschi Jamet, Waller, Albouy & Caussanel, 1999 – Madagascar
-> Blandex solvendus Burr, 1912 – South Africa, Lesotho, Swasiland
-> Blandex variegatus Hincks, 1957 – Cape Province
Parablandex Brindle, 1966
-> Parablandex albocincta Brindle, 1966 – Madagascar
-> Parablandex albovittata (Burr, 1904) – Madagascar

Literature:
Steinmann (1986) Catadermaptera I
Steinmann (1989b) World Catalogue of Dermaptera
Dermaptera Species File (2024)

PICTURES:
Blandex variegatus and Alloblandex granulatus from South Africa with a lot of nymphs:
https://www.inaturalist.org/observations?taxon_id=1041814

I collected drawings and holotype pictures of both species and compared the original descriptions, pictures, drawings and museum specimens - I believe it's one single species, that's why I ignored A. bituberculatus here.
It's not scientifically proven yet, but for the absolute status quo DSF should be the right database (when it's soon up to date), while this forum should also be a place to discuss and keep track of taxonomic issues like this one.

I don't know how to start a revision of this topic, Srivastava didn't answer my mail, probably he's not even alive anymore and nobody else has experience with those species. Maybe it will only be possible by ordering the holotypes and comparing them (I was being told by Petr Kocárek I think or another expert), but that's too much for a private person.