Facial fovea of Andrena rugosa. The lower half of the facial fovea in Trachandrena is usually much narrower than the upper portion, though this species is the most extreme example.

 
 
  Part of: Sheffield CS (2020) A new species of Andrena (Trachandrena) from the Southwestern United States (Hymenoptera, Andrenidae). Journal of Hymenoptera Research 77: 87-103. https://doi.org/10.3897/jhr.77.53704