Xystosomus batesi Erwin 1973, new species

FIGURES 18, 69

TYPE-LOCALITY.— Petrópolis, Brazil.

TYPE-SPECIMEN.—The unique holotype female, collected by Sahlberg, is in MHNP.

DESCRIPTION.—Form: As in X. gruti , except shorter. Easily distinguished by the absence of elytral microsculpture and the short frontal furrows.

Color: Head and body piceous; pronotum and head shiny; appendages tetaceous or partly infuscated.

Head: Narrow between eyes; frontal furrows deeply impressed, short, extended to mideye level; eyes large and prominent.

Pronotum (Figure 18).— Transverse (W /L, 1.61; 1 specimen); hind angles slightly obtuse; sides anterior to angles slightly arcuate; otherwise as in X. gruti.

Elytra: Each elytron with seven rows of serial punctulae; stria 8 well impressed, coarsely punctate in basal half; punctulae of disc smaller and less impressed than those laterally, all rows effaced before apex; intervals flat, except interval 8 which is slightly convex; side margins broadly explanate; humeral tooth well developed, rounded; chaetotaxy as in X. gruti; plica small, evident externally.

Microsculpture: Head and pronotum as in X. gruti, except faintly impressed on pronotum; effaced from elytra.

Secondary sexual characters: Male genitalia unknown. Female genitalia characteristic of the species group.

Size: One specimen: length, 3.4 mm; width, 1.7 mm.

NATURAL HISTORY.— Unknown.

LOCALITY RECORDS (Figure 69).—I have seen only the unique type from Petrdpolis, Brazil.