Dichotomius interstitialis (Luederwaldt)

Nunes, Rafael V. & Vaz-De-Mello, Fernando Z., 2013, New brachypterous species of Dichotomius Hope, with taxonomic notes in the subgenus Luederwaldtinia Martínez (Coleoptera: Scarabaeidae: Scarabaeinae), Zootaxa 3609 (4), pp. 411-420 : 416

Dichotomius interstitialis (Luederwaldt)

Luederwaldt (1931) proposed that D. interstitialis be placed in its own species group. After examining the holotype (located in the MZSP) and scrutinizing the original description, where the author compares it to the D. carbonarius species group, we place this species in the D. carbonarius species group based on the following characters: the elytra with microsculpture ( Fig. 2 I); the cephalic carina with two tubercles; the pronotum without horns, tubercles, or knobs; the metatibial spur not bifurcated; and the body shape very similar to other species of this species group.

Figures

FIGURE 2. Dichotomius eucranioides (A) black arrow indicating crenulated clypeal margin; D. sexdentatus (B) black arrow indicating tooth or protuberance on clypeogenal junction (this is also seen on D. eucranioides); D. nisus (C) black arrow indicating the asymmetry of the parameres; D. crinicollis (D) black arrows indicating pilosity on the hypomeron; D. superbus (E) white arrow indicating gibbosities on the pronotum; D. schiffleri (D. sericeus species group) (F) white arrow indicating a fovea on the posterior angle of the pronotum; D. speciosus (G) black arrows indicating cephalic transversal carina; D. agenor (H) black arrow indicating male cephalic carina; D. glaucus (D. carbornarius species group) (I) elytra microsculpture.