Xystosomus ampliatus Bates, 1884

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 : 9

2. Xystosomus ampliatus Bates

FIGURES 7 , 69

Xystosomus ampliatus Bates, 1884:290 . [Lectotype, female, BMNH, here selected. Type-locality: Bugaba, Panama.]

DESCRIPTION.—Form: As in X. gruti , but larger.

Easily distinguished from X. gruti by the overall rufous color, less impressed lateral striae, and the broadly explanate sides of pronotum and elytra.

Color: Body rufous; pronotum and elytra dorsally with slight iridescence; appendages testaceous.

Head: As in X. gruti except frontal furrows less impressed, closer to eye margin; eyes very large and prominent.

Pronotum ( Figure 7 ): As in X. gruti except explanations broader (W/L, x 1.63; range, 1.56— 1.68; 3 specimens).

Elytra: As in X. gruti except lateral striae less impressed than discal ones and explanations broader.

Microsculpture: As in X. gruti .

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

Size: Three specimens: length, 4.8-5.5 mm; width, 2.2-2.4 mm.

NATURAL HISTORY.—Adults were collected in August and January. No teneral specimens were seen. Nevermann recorded a specimen in "fermenting plant juice on fresh cut wood, August" and a specimen "at night on dry wood of Sapotacca [PSapotaceae], January."

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

CENTRAL AMERICA: COSTA RICA: Hamburg Farm at

Reventazon (USNM). PANAMA: " Panama " (MHNP); Bug-

aba (BMNH).

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.