Abstract
The morphology of the peritremes of the genera Varroa and Euvarroa in the family Varroidae are described. In the genus Varroa, the moveable emergent peritreme lies flat along the venter laterad of legs III and IV but can be lowered 90° as necessary. The sclerotized peritremal groove consists of an ascending and a shorter descending arm thus forming a hook around the tip of the peritreme. The interior of the groove and stigmatal atrium are lined with micropapillae (=microtricheae). The remainder of the peritreme is a sac-like structure that is continuous with the body hemocoel. The peritreme of Euvarroa does not appear to be moveable or only slightly so and is positioned flush with the soft cuticle of the body laterad and somewhat posterior to legs IV. The sclerotized peritrematic groove is U-shaped and lined with micropapillae. The stigmata are open but are not continuous with the peritrematic groove as in Varroa.
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