Genus: Sesaspis

• Description: Antennae 10-segmented with a 2-segmented club. Antennal setation sparse. Eyes well-developed, elongate-oval, somewhat reniform, coarsely faceted, extending well onto dorsal portion of head. Lateral margins of pronotum arcuate to sinuate, without distinct lobes. Pronotal disc with several raised ridges. Apical margin of hypomeron with short, arcuate depression. Prosternum without distinct transverse groove. Procoxal cavities closed. Metacoxae widely separated, separation as wide or wider than metacoxal length. Scutellum greatly reduced or absent from view. Abdominal ventrite 5 with a narrow arcuate preapical groove. Tarsal formula 5-5-4. Dorsal surface tomentose. Ventral surface with punctures from which a single seta arises. Dorsal and ventral surfaces commonly encrusted with dirt and debris.

• Similar genera: The genus Sesaspis is similar to the genera Phloeodes, Phellopsis, and Zopherus. Sesaspis is most similar to Phloeodes, but can be distinguished by antennomere 3 only slightly longer than 4 (in Phloeodes, antennomere 3 distinctly longer than 4) and the pronotal disc with more well-defined raised ridges (in Phloeodes, mostly flat, bearing small, round tubercles). Phellopsis can immediately be distinguished by the 11-segmented antennae with a 3-segmented club, narrowly open procoxal cavities, hypomeron with lack of depression/antennal cavity, and a small but visible scutellum. The genus Zopherus can immediately be distinguished by the 9-segmented antennae with a 1-segmented club composed of 3 fused segments, the deep antennal cavities on the prothoracic hypomera, and the paired rows of fine golden setae on all femora and tibiae.

• Southcentral (TX), Southwest (NM) USA.

• Sesaspis has been collected from under loose bark of pine and oak.
  
  
• Abundance: uncommon.

• Members of this genus are frequently encrusted with dirt and other debris which may conceal the diagnostic characters.

• Foley and Ivie (2008)
• Horn (1878)
• Ivie (2002)
• Ślipiński and Lawrence (1999)