Xystosormis sulcicostis Bates, 1882

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 : 18

11. Xystosormis sulcicostis Bates

FICURES 16 , 33 , 69

Xystosomus sulcicostis Bates, 1882:146 . [Lectotype, female, BMNH, here selected. Eleven paralectotypes, labelled by me: BMNH, 7; MHNP, 4. Type-locality: Volcan de Chi- riqui, Panama.]

DESCRIPTION.— Form: As in X. gruti , except elytra much shorter and convex. Easily distinguished by the extended lateral intervals of the elytra; other similar species with smooth elytra have the convex intervals in basal half only.

Color: Head and body piceous; pronotum and elytra moderately iridescent; appendages testaceous.

Head: Broad between eyes; frontal furrows well impressed, sulcate posteriorly; eyes large and prominent.

Pronotum ( Figure 16 ): Transverse (W/L, x 1.60; range, 1.47-1.68; 7 specimens), otherwise as in X. gruti .

Elytra: Striae 1-4 faintly impressed and faintly punctulate; intervals flat; striae 5-8 deeply impressed, almost sulcate between highly convex in- tervals, and faintly punctulate; otherwise as in X. gruti .

Microsculpture: As in X. gruti .

Secondary sexual characters: Male genitalia ( Figure 33 ) and female genitalia characteristic of the species group.

Size: Seven specimens: length, 3.2-3.7 mm; width, 1.5-1.8 mm.

NATURAL HISTORY.—Unknown, except that Bates' series was collected between 2,000 and 4,000 feet (610-1,220 m) elevation.

LOCALITY RECORDS ( Figure 69 ).—I have seen twelve specimens from the following locality: CENTRAL AMERICA: PANAMA: Volcan de Chiriqui (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.