Xystosomus strigosus Bates, 1863

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 : 10

4. Xystosomus strigosus Bates

FIGURES 4-6 , 9, 26, 29

Xystosomus strigosus Bates, 1871a:248 . [Lectotype, female, MHNP, here selected. Type-locality: Rio de Janeiro, Bra- zil.]

DESCRIPTION.—Form: Generally as in X. gruti except narrower, with more highly convex elytra, and with much smaller eyes. Color as in X. ampliatus but easily distinguished from that species by the narrower explanations of the pronotum and elytra.

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

Head: Narrow between eyes; frontal furrows deeply and broadly impressed; eyes moderately large and prominent; mouthparts as in Figures 4, 5 .

Pronotum ( Figure 9 ): Less transverse than in X. gruti (W/L, x 1.51; range, 1.42-1.64; 5 specimens) and with less explanate side margins, otherwise similar; anterior leg as in Figure 6 .

Elytra: As in X. gruti except all striae evenly impressed and explanations narrower.

Microsculpture: As in X. gruti .

Secondary sexual characters: Male genitalia (Figure 26) and female genitalia characteristic of the species group.

Size: Five specimens: length, 3.5-3.9 mm; width, 1.6-1.8 mm.

NATURAL HISTORY.— Unknown, except adults collected in August and September. No teneral specimens seen.

LOCALITY RECORDS ( Figure 69 ).—I have seen six specimens from the following localities: SOUTH AMERICA: BRAZIL: Rio de Janeiro Province: " Rio Janeiro" (BMNH); Rio Parahyba (MHNP). Santa Clara Province: Nova Teutonia (MCZ, USNM).

Figures

FIGURE 69.—Approximate range of the gruti group.

FIGURES 4-6.—Xystosomus strigosus Bates, male, from Nova Teutonia, Brazil: 4, maxilla, left side, dorsal aspect; 5, labium, right side, ventral aspect; 6, anterior left leg, posterior aspect.

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.