Studies of the subtribe Tachyina (Coleoptera: Carabidae: Bembidiini), Part I: A revision of the Neotropical genus Xystosomus Schaum Author Erwin, Terry L. text Smithsonian Contributions to Zoology 1973 1973-12-31 140 1 39 http://dx.doi.org/10.5479/si.00810282.140 journal article 10.5479/si.00810282.140 974fe412-0658-41ad-bb31-cd2c52bf34f2 3828531 8. Xystosomus aetholius , new species FIGURES 13 , 30 , 69 TYPE-LOCALITY.— Cochabamba , Bolivia . TYPE-SPECIMENS.—The holotype male and allotype are in MHNP . These and the paratypes were 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. collected by P. Germain ( no date ). Paratypes (31): MHNP, 22; USNM, 9. DESCRIPTION.—Form: As in X . gruti , except elytra slightly more convex. Easily distinguished from all other species of the group by the complete lack of elytral striae. Color: Head and body rufous, pronotum and elytra slightly iridescent, appendages testaceous. Head: Broad between eyes; frontal furrows moderately impressed; eyes large and prominent. Pronotum ( Figure 13 ): Slightly transverse (W/L, x 1.49; range, 1.41-1.60; 33 specimens), otherwise as in X . gruti . Elytra: Striae absent; side margins broadly explanate; humeral projection small, blunt; chaetotaxy as in X . gruti ; plica small, evident externally. Microsculpture: As in X . gruti . Secondary sexual characters: Male genitalia characteristic of the species group (Figure 30). Female genitalia characteristic of the species group. Size: Thirty-three specimens: length, 3.5-4.8 mm; width, 1.6-2.0 mm. VARIATION.—The long series of specimens, all from the type, locality, is remarkably homogeneous, except in size and proportions of the pronotum. NATURAL HISTORY .— Unknown . LOCALITY RECORDS ( Figure 69 ).— I have seen 33 specimens from the following locality: SOUTH AMERICA: BOLIVIA: Cochabamba ( MHNP, USNM ).