Xystosomus paralaevis, 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 : 30-31

27. Xystosomus paralaevis , new species

FIGURES 58 , 72

TYPE-LOCALITY.— Sao Paulo, Brazil.

TYPE-SPECIMENS.—The holotype female is in

MHNP. Nine female paratypes, all from the typelocality: BMNH, 1; MHNP, 5; USNM, 3.

DESCRIPTION.— Form: As in X. laevis , except pronotum broader (see below). Easily distinguished from all species of the group having no pronotal setae by the sharp hind angles of the pronotum along with evenly arcuate side margins of the pronotum and bright rufous integument.

Color: Head and body bright rufous; elytra slightly iridescent; appendages testaceous or slightly infuscated dorsally, antennae apically.

Head: Broad between eyes; frontal furrows shallowly impressed, divergent posteriorly; eyes medium-sized and flat.

Pronotum ( Figure 58 ): Broadly transverse (W/L, x 1.83; range, 1.76-1.91; 10 specimens); lateral setigerous pores absent; hind angles sharp, about 90°, sides anterior to angles evenly arcuate; side margins beaded, not reflexed.

Elytra: Smooth, but some specimens with faint traces of striae on disc; otherwise as in X. laevis .

Microsculpture: As in X. laevis .

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

Size: Ten specimens: length, 1.9-2.2 mm; width, 1.0-1.2 mm.

NATURAL HISTORY.— Unknown, except one adult collected in July. No teneral specimens seen.

LOCALITY RECORDS ( Figure 72 ).—I have seen ten specimens, all from the following locality:

SOUTH AMERICA: BRAZIL: Sao Paulo (BMNH, MHNP, USNM).

Figures

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.