Illustration of the neck (posterior region of the head) and the anterior clypeal margin of ACamponotus imitator (CASENT0452849), and B Camponotus karaha (CASENT0152090). Arrows indicate the posterior portion of the head capsule which in karaha is drawn out into a strongly constricted neck, behind which the head capsule flares out, forming a pronounced collar.

 
 
  Part of: Rasoamanana N, Csősz S, Fisher BL (2017) Taxonomic revision of imitating carpenter ants, Camponotus subgenus Myrmopytia (Hymenoptera, Formicidae) of Madagascar, using morphometry and qualitative traits. ZooKeys 681: 119-152. https://doi.org/10.3897/zookeys.681.13187