Xystosomus notiophiloides, 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 : 22-23

18. Xystosomus notiophiloides , new species

FIGURES 38 , 70

TYPE-LOCALITY.— Jatahy, Goyaz Province , Brazil. TYPE-SPECIMENS.—The holotype female is in MHNP. Three paratypes: MHNP, 2; USNM, 1. All four were collected by Donckier in 1903.

DESCRIPTION.—Form: As in X. elaphrinus , although smaller and flatter; superficially resembling members of genus Notiophilus . Easily distinguished from the other two species of the group by the elytra, each of which has eight serial rows of small, even punctulae entire to apex.

Color: Head and body piceous; entire dorsal surface of head and body shiny with metallic green luster; appendages testaceous or partially infuscated.

Head: Very broad between eyes; frontal furrows moderately impressed and separated from eye by small rounded costae; eyes huge and hemispherical.

Pronotum ( Figure 38 ): Quadrate (W/L, x 1.51; range, 1.47-1.57; 4 specimens); otherwise as in X. elaphrinus .

Elytra: Each elytron with eight serial rows of small, even punctulae, each entire to apex; lateral rows more impressed than discal rows; otherwise as in X. elaphrinus .

Microsculpture: As in X. elaphrinus , except head with faintly impressed, nearly isodiametric meshes.

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

Size: Four specimens: length 3.2-3.5 mm; width, 1.36-1.40 mm.

NATURAL HISTORY.— Unknown, except adults collected in March. No teneral specimens seen.

LOCALITY RECORDS ( Figure 70 ).—I have seen four specimens from the following locality:

SOUTH AMERICA: BRAZIL: Goyaz Province: Jatahy (MHNP, USNM).

Figures

FIGURE 70 Approximate ranges of the elaphrinus group (crosshatched area) and the micro- tretus group (solid areas).

FIGURES 37-39.—Pronotum, dorsal aspect: 37, Xystosomus elaphrinus, male, Roches de Konrou, French Guiana; 38, X. notiophiloides, female, Jatahy, Brazil; 39, X. spangleri, female, 9.0 miles west of Los Algarrobos, Panama.