Pericompsus (Eidocompsus) crossarchon Erwin 1974

Pericompsus crossarchon

TYPE-LOCALITY.—Rio Caraguata, Mato Grosso State, Brazil.

TYPE-SPECIMEN.—The unique female holotype is in MCZ. It was collected by F. Plaumann in 1953.

DESCRIPTION.—Form (Figure 42): Similar to P. brasiliensis, but easily distinguished from members of that species by the presence of a punctate interneur 6 on each elytron and the presence of long setae on the elytral margin.

Color: Forebody and venter piceous, elytra rufescent with slightly darker elytral cloud; appendages, except infuscated antennal articles 2–4, testaceous.

Head: Across eyes much narrower than width of pronotum; frontal furrows well impressed and evenly arcuate to posterior margin of eye; eyes large and prominent.

Pronotum (Figure 42): Broadly subcordate, sides moderately strongly sinuate in basal half; base slightly arcuate at middle; hind angles slightly obtuse; side margins not reflexed; disc moderately convex.

Elytra: Each elytron with 6 punctate interneurs; punctures moderately large, separated longitudinally by at least their own diameter; rows 2–6 effaced in apical third, row 1 striate apically; interneur 7 effaced externally throughout; interneur 8 well impressed throughout, and bifoveate just posterior to Eo4c; fovea small, subequal in diameter to width of elytral explanation; humeral margin rounded and somewhat concave to level of interneur 4, not connected to base of 4; side margin narrowly explanate, coarsely serrate in basal fourth, setose throughout its length, setae longer than width of explanation; chaetotaxy as in P. brasiliensis; plica long and well developed externally.

Microsculpture: Effaced from dorsal surface.

Genitalia: Male unknown; female not dissected.

Size: Length, 2.60 mm; width, 1.16 mm; the type measured.

NATURAL HISTORY.—The single specimen was collected in March; it was not teneral.

ETYMOLOGY.—Greek masculine noun, krossos, meaning “fringe,” and Greek masculine noun, archon, meaning “king,” referring to the large size of these beetles and the fringe of setae on the elytral margin.

LOCALITY RECORDS (Figure 54).—I have seen only the type, from Rio Caraguata, Mato Grosso State, Brazil.