Eschatomoxys Blaisdell, 1935

López-Guerrero, Irma, 2007, Figs. 30 – 33. Attavicinus monstrosus. 30 in Comparison of Mouthpart Morphology of Three Species of Mexican Oniticellini (Coleoptera: Scarabaeidae: Scarabaeinae) in Relation to Their Trophic Habits, The Coleopterists Bulletin 61 (4), pp. 519-540 : 519-540

Key to Species of Eschatomoxys Blaisdell

1. Pronotum with lateral marginal bead complete ( Fig. 6 )................ 2

1. 9 Pronotum with lateral marginal bead incomplete ( Figs. 3 , 5 ), a ruga extending back from anterior angle and forward from posterior angle, but absent at middle....................................................... 3

522 524 2. Pronotum with anterolateral angles acutely produced cephalad ( Fig. 7 ); disc with surface densely, coarsely punctate, punctures equal in size to eye facets, most separated by about width of puncture (Gulf of California)................................. E. paco Aalbu and Thomas

2. 9 Pronotum with anterolateral angles only weakly produced; disc finely, sparsely punctate, separation mostly three times puncture width (southern California)..................... E. a ndrewsi Aalbu and Thomas

3. Eyes large in proportion to size of head, separation between posterior margin of eye and cervix less than twice diameter of eye ( Fig. 4 )..... 4

3. 9 Eyes small in proportion to size of head, separation between posterior margin of eye and cervix at least twice diameter of eye ( Fig. 5 )....... 5

4. Anterolateral angles of pronotum somewhat produced; lateral marginal bead extending back from anterolateral angle about onehalf width of pronotum; punctures dorsad of bead coarse and dense (midriff Islands, Baja California)........... E. rosei Aalbu and Thomas

4. 9 Anterolateral angles of pronotum weakly produced ( Fig. 3 ); lateral marginal bead extending back from angle only about one-fourth to one-third width of pronotum; punctures dorsad of bead sparse (California and Arizona)............................. E. wagneri Blaisdell

5. Gula well demarcated, rectangular; tentorial pits distinct, each pit connected to cervix by narrow, linear sulcus; cuticle of gula shargreened, cuticle either side of gula rugopunctate (Grand Canyon, Arizona)..................................... E. pholeter Thomas and Pape

5. 9 Gula obsolescent, when evident, subtriangular (narrowed anteriorly); tentorial pits indicated only as scars; cuticle behind pits rugopunctate (southern Utah).......................... E. tanneri Sorensen and Stones

Figures

Figs. 6–7. Eshatomoxys spp., head and pronotum. 6) E. rosei, lateral view, with complete marginal bead; 7) E. paco, dorsal view, showing produced anterior pronotal angles.

Figs. 2–3. Eschatomoxys wagneri. 2) Epistoma, frontal view; 3) lateral view of pronotum, marginal bead obsolete.

Figs. 4–5. Eschatomoxys spp. head and pronotum, lateral view. 4) E. wagneri, with relatively large eyes; 5) E. pholetor, with relatively small eyes.