Xystosomus grossipunctatns, 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 : 20

16. Xystosomus grossipunctatns , new species

FIGURES 2 1, 69

TYPE-LOCALITY.— Caraca , Minas Gerais, Brazil.

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

DESCRIPTION.—Form: As in X. gruti , except elytra more convex. Easily distinguished by the large coarse punctures of the elytra along with the completely microsculptured dorsum.

Color: Forebody piceous; elytra rufopiceous; pronotum and elytra slightly iridescent; appendages testaceous.

Head: Broad between eyes; frontal furrows deeply impressed and linear, separated from eye by strongly developed carina; eyes medium-sized, moderately prominent.

Pronotum ( Figure 21 ): Transverse (W/ L, 1.45); hind angles about 90 °, sides anterior to angles, straight; otherwise as in X. gruti .

Elytra: Each elytron with seven rows of serial punctures; laterally, punctures coarser and more deeply impressed; all rows effaced at apical sixth; row 8 absent; all intervals flat; side margins broadly explanate; humeral tooth well developed, blunt; chaetotaxy as in X. gruti ; plica long, evident externally.

Microsculpture: As in X. gruti .

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

Size: One specimen: length, 4.1 mm; width, 1.7 mm.

NATURAL HISTORY.— Unknown.

LOCALITY RECORDS ( Figure 69 ).—I have seen only the unique type from Caraca, Minas Gerais Province, Brazil.

Figures

FIGURE 69.—Approximate range of the gruti group.

FIGURES 7-21.—Pronotum, dorsal aspect: 7, Xystosomus ampliatus, female, Hamburg Farm, Costa Rica; 8, X. nigripalpis, female, Barro Colorado Island, Panama; 9, X. strigosus, female, Rio Parahyba, Brazil; 10, X. iris, female, Cochabamba, Bolivia; 11, X. sculpticollis, female, Teffe, Brazil; 12, X. negrei, male, Rancho Grande, Venezuela; 13, X. aetholius, female, Cochabamba, Bolivia; 14, X. anterocostis, Hamburg Farm, Costa Rica; 15, X. sublaevis, male, Rio Banano, Costa Rica; 16, X. sulcicostis, female, Volcan de Chiriqu!, Panama; 17, X. apicisulcatus, female, Minas, Brazil; 18, X. batesi, female, Petr6polis, Brazil; 19, X. seriatus, female, Nova Teutonia, Brazil; 20, X. ovatulus, female, Caraca, Brazil; 21, X. grossipunctatus, female, Caraca, Brazil.