Xystosomus turgidus (Schaum), 1863

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 : 34-35

32. Xystosomus turgidus (Schaum)

FICURES 22 d-e, 62 , 72

Tachys turgidus Schaum 1863:89 . [Type missing from the point; lost in mail during transport to J. Negre, December 1963, according to Hieke's note on pin in HUB. Neotype, female, here selected from MCZ material determined by Van Emden, who undoubtedly saw the type. Type-locality: Originally "Brasilia," according to Schaum and labels, but herewith restricted to Nova Teutonia , Santa Catarina, Brazil, from labels appearing on selected neotype.] DESCRIPTION.—Form: As in X. laevimicans .

Easily distinguished from all other species in the

group by the absence of lateral setigerous pores at the hind angles of the pronotum together with the obtuse hind angles of the pronotum.

Color: Head and forebody rufopiceous; elytra usually darker; pronotum and elytra moderately iridescent; appendages testaceous; antennae slightly infuscated apically.

Head: Broad between eyes; frontal furrows shal- lowly impressed, straight, posteriorly divergent; eyes small, large-faceted, slightly prominent.

Pronotum ( Figure 62 ): Broadly transverse (W/L, x 1.75; range, 1.62-1.86; 18 specimens); anterior pair of lateral setigerous pores present at apical third, posterior pair absent; laterobasal carinae rudi- mentary; hind angles sharp, obtuse, sides anterior to angles more or less straight; side margins beaded, not reflexed.

Elytra: Smooth; seta Eo4 in position d rather than c; plica small, evident externally.

Microsculpture: As in Figure 22 d,e .

Secondary sexual characters: Male unknown.

Female genitalia characteristic of the species group. Size: Eighteen specimens: length, 2.0-2.4 mm;

width, 1.0-1.2 mm.

NATURAL HISTORY.— Unknown, except adults collected in December, January, and February. One teneral specimen collected in December. The Nova Teutonia specimens were collected at 300-500 meters elevation. LOCALITY RECORDS ( Figure 72 ).— I have seen 18 specimens from the following localities:

SOUTH AMERICA: BRAZIL: Mato Grosso Province: Caraguata (MCZ). Santa Catarina Province: Nova Teutonia (MCZ, USNM).

Figures

FIGURE 22.—Scanning electron micrographs (X125O) of dorsal microsculpture. Xystosomus gruti: a, frons; b, pronotal disc; c, disc of left elytron; note serial puncture. Xystosomus turgidus: d, frons; e, pronotal disc; /, disc of left elytron. Xystosomus ovatulus: g, disc of left elytron; note serial puncture.

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

FIGURES 57-62.—Pronotum, dorsal aspect: 57, Xystosomus laevis, female, Nova Teutonia, Brazil; 58, X.paralaevis, female, Sao Paulo, Brazil; 59, X. laevimicans, female, Santos, Brazil; 60, X. niger, female, Serra Bocaina, Brazil; 61, X. tholus, male, Alto da Serra, Brazil; 62, X. turgidus, female, Rio Caraguata, Brazil.