Xystosomus parainsularis, 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 : 26

22. Xystosomus parainsularis , new species

FIGURES 47 , 49 , 51 , 71

TYPE-LOCALITY.— Colonia Tovar , Venezuela.

TYPE-SPECIMENS.—The holotype male and allotype are in MHNP. The holotype was collected by Simon in 1888. The allotype and two paratypes are simply labelled "Novo Gren." [Colombia], and two other paratypes are labelled "Colomb. Orient." Four paratypes: MHNP, 2; USNM, 2.

DESCRIPTION.— Form: Elongate and convex with broad head and narrow pronotum. Easily distinguished from the other species of the group by the smooth elytra.

Color: Head and body rufopiceous; pronotum and head slightly darker than the elytra; appendages testaceous; antennae slightly infuscated apically.

Head: Very broad between eyes; frontal furrows moderately impressed; eyes large and prominent.

Pronotum ( Figure 47 ): Slightly transverse (W /L, x 1.45; range, 1.42-1.50, 6 specimens); lateral setigerous pores present at anterior third and at hind angles; laterobasal carinae well developed; hind angles obtuse, sides immediately anterior to angles slightly arcuate then straight; side margins slightly explanate.

Elytra: Smooth; chaetotaxy as in X. inflatus ; plica small, evident externally.

Microsculpture: As in X. inflatus , except coarser on pronotum.

Secondary sexual characters: Male genitalia ( Figure 49 ) and female genitalia (Figure 51) characteristic of the species group.

Size: Six specimens: length, 3.0- 3.4 mm; width, 1.3-1.5 mm.

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

LOCALITY RECORDS ( Figure 71 ).—I have seen six specimens from the following localities:

SOUTH AMERICA: COLOMBIA: "Colomb." (MHNP); "Novo. Gren." (MHNP, USNM). VENEZUELA: Colonia Tovar (MHNP).

Figures

FICI'RE 51.—Female genitalia, ventral aspect, with spermathecal reservoir, of Xystosomus parainsularis, Nueva Grenada (Colombia).

FIGURE 71 Approximate ranges of the parainsularius group (crosshatched areas).

FIGURES 47, 48.—Pronotum, dorsal aspect: 47, Xystosomus parainsularis, male, "Colombia Oriental"; 48, X. bisulcifrons, male, Rio Parahyba, Brazil.

FIGURES 49, 50. Male genitalia, left lateral aspect: 49, Xystosomus parairuularis, Colonia Tovar, Venezuela; 50, X. bisulcifrons, Rio Parahyba, Brazil.