Xystosomus convexus, Erwin, 1973

Erwin, Terry L., 1973, Studies of the subtribe Tachyina (Coleoptera: Carabidae: Bembidiini), Part I: A revision of the Neotropical genus Xystosomus Schaum, Smithsonian Contributions to Zoology 140, pp. 1-39 : 29

25. Xystosomus convexus , new species

FIGURES 53 , 72

TYPE-LOCALITY.— Minas, Brazil.

TYPE-SPECIMEN.—The unique holotype, a female, is in MHNP. It was collected by Squires.

DESCRIPTION.—Form: As in X. inflatus , except broader and more highly convex, but easily distinguished by the small, sharp laterobasal carinae of the pronotum.

Color: Head and body rufopiceous, shiny; appendages testaceous; antennal articles apically slightly infuscated.

Head: As in X. inflatus except fovae shallower.

Pronotum ( Figure 53 ): Very transverse (W/ L, x 1.82); laterobasal carinae small and very sharp; otherwise as in X. inflatus .

Elytra: Smooth, highly convex; otherwise as in X. inflatus .

Microsculpture: As in X. inflatus .

Secondary sexual characters: Male genitalia unknown. Female genitalia not investigated because of the poor condition of the specimen.

Size: The holotype: length, 2.9 mm; width, 1.6 mm.

NATURAL HISTORY.— Unknown.

LOCALITY RECORDS ( Figure 72 ).—I have seen only the unique type from Minas, Brazil.

Figures

FIGURE 72.—Approximate range of the inflatus and laevis groups.

FIGURES 52, 53.—Pronotum, dorsal aspect: 52, Xystosomus inflatus, male, Caraca, Brazil; 53, X. convexus, female, Minas, Brazil.