Xystosomus seriatus, 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 : 19-20

14. Xystosomus seriatus , new species

FIGURES 19 , 34 , 69

TYPE-LOCALITY.— Nova Teutonia , Santa Catarina, Brazil.

TYPE-SPECIMENS.—The holotype male and allotype are in BMNH. Both were collected by Plaumann in 1934. Two paratypes: BMNH, 1; MHNP, 1.

DESCRIPTION.— Form: As in X. gruti , except elytra more convex. Easily distinguished from all species of the group by the complete lack of pronotal and elytral microsculpture.

Color: Head and body rufopiceous; pronotum and elytra very shiny; appendages testaceous or partially infuscated.

Head: Narrow between eyes; frontal furrows linear and deeply impressed, extended to past mideye level; eyes large and prominent.

Pronotum ( Figure 19 ): Transverse (W/ L, x 1.52; range, 1.47-1.57; 4 specimens): hind angles slightly obtuse; sides anterior to angles straight; side margins slightly explanate basally, beaded anteriorly; otherwise as in X. gruti .

Elytra: Each elytron with eight rows of serial punctulae, laterally more coarsely punctulate and partially or totally striate (especially striae 7 and 8); discal intervals flat, lateral intervals slightly convex; otherwise as in X. gruti .

Microsculpture: Head with slightly transverse, finely impressed meshes, more isodiametric near clypeus; effaced from pronotum and elytra.

Secondaiy sexual characters: Male genitalia ( Figure 34 ) and female genitalia characteristic of the species group.

Size: Four specimens: length, 3.0-3.4 mm; width, 1.4—1.5 mm.

NATURAL HISTORY.— Unknown, except adults collected in March and May. The specimen collected in May is slightly teneral.

LOCALITY RECORDS ( Figure 69 ).—I have seen four specimens from the following locality:

SOUTH AMERICA: BRAZIL: Santa Catarina State: Nova

Teutonia (BMNH, MHNP).

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.

FIGURES 31-35.—Male genitalia, left lateral aspect, of five species of the gruti group: 31, Xysto- somus anterocostis, Hamburg Farm, Costa Rica; 32, X. sublaevis, Volcan de Chiriqui, Panama; 33, X. sulcicostis, Volcan de Chiriqui, Panama; 34, X. seriatus, Nova Teutonia, Brazil; 35, X. ovatulus, Nova Friburgo, Brazil.