alternative definition added almost 15 years ago by Andy Deans
The arms of the epicranial suture diverging ventrally (or anteriorly) from the coronal suture between the antennal bases toward the anterior articulations of the mandibles.
Reference: Snodgrass, R. E. 1935. Principles of insect morphology. McGraw-Hill Book Co., Inc., New York & London 667 pp.
Cross reference:
None provided.