A new article about Myrmecina with determination-key:
Satria, R.; Yamane, S. 2019. Two new species of the ant genus Myrmecina (Hymenoptera: Formicidae: Myrmicinae) from Sumatra. Zoosystematica Rossica 28:183–193.
http://www.antcat.org/document…r_2019_28_1_satria_-1.pdf
If there aren't more species?