Torben Larsen developed a species numbering system for his 2005 publication Butterflies of West Africa. The subspecies tritogenia is #44. The 'Larsen' numbers have since been used with permission in A Sharp Eye on Butterflies of Ghana.
References
12Pinacopteryx at Markku Savela's Lepidoptera and Some Other Life Forms
12Woodhall, Steve (2005). Field Guide to Butterflies of South Africa. Cape Town, South Africa: Struik. ISBN978-1-86872-724-7.
↑Larsen, Torben B. (2005). Butterflies of West Africa. Stenstrup, Denmark: Apollo Books. ISBN978-87-88757-43-9.