Isoforma planata OPITZ nov. sp.

(Figs 72, 157, 174)

Holotype: ♀. Mexico, Chiapas, Laguna Belgica, 16 km NW Ocozocoautla, 970 m, 7-VI-1990, H. & A. Howden (CMNC).

Diagnosis: Within Isoforma only in the members of this species is the 9 th antennomere subquadrate.

Description: Size: Length 12.0 mm; width 7.0 mm. Form: As in Fig. 157. Color: Cranium mostly black, vertex with narrow testaceous streak; pronotum mostly flavotestaceous, with two paralateral black lines; elytra bicolorous, basal half testaceous, distal half black. Head: Antennal capitulum very long (Fig. 72), each capitular antennomere longer than funicle; antennal carina very prominent; frons as wide as eyes; EW/FW 20/20. Thorax: Pronotal anterior margin linear, not projected at middle; side margins of disc rounded at middle, quadrate; PW/PL 75/75; elytra conspicuously flared; discal carinae not present; EL/EW 320/120. Abdomen: Female pygidium not incised at distal margin.

Natural history: The holotype was collected during June, at 970 m.

Distribution (Fig. 174): Known only from the type locality.

Etymology: The trivial name planata is a Greek adjective derived from platys (= wide). I refer to the extensive width of the elytra.