A friend needs to identify species of Lampyridae present in the tropics for his study. Could you please recommend keys or sources or experts that he can consult with?
You could contact the author of this as they are on ResearchGate https://www.researchgate.net/publication/232679032_Oculogryphus_A_Remarkable_New_Genus_of_Fireflies_from_Asia_%28Coleoptera_Lampyridae%29
Article Oculogryphus, A Remarkable New Genus of Fireflies from Asia ...
Have a look at LESLEY A. BALLANTYNE & CHRISTINE L. LAMBKIN
Systematics and Phylogenetics of Indo-Pacific Luciolinae Fireflies (Coleoptera: Lampyridae) and the Description of new Genera. That has keys to genera based on males. I have uploaded a full text of this, but it may not remain there for long.