1982] Downing & Jeanne — Mandibular Gland in Polistes 319 
Figs. 1-2. Fig. 1. Ectal mandibular gland histology. Sagittal sections through a) 
reservoir (arrow points to gland cells at the top of reservoir) and b) reservoir duct, 
showing duct opening to the mandibular brush (arrow). Anterior is to the right. 
Fig. 2. Ectal mandibular gland opening, frontal view. SEM micrograph of the 
exposed mandibular brush, located just below the opening of the ectal mandibular 
gland (arrow). The mandible is in an open position. Clypeus is on the left, compound 
eye in the upper right. 
