Xystosomus spangleri, 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 : 23

19. Xystosomus spangleri , new species

FICURES 39 , 41 , 70

TYPE-LOCALITY.— Nine miles west of Los Algarrobos (near Rio San Pedro ), Panama. TYPE-SPECIMENS.—The holotype male and allotype are in USNM. Both were collected by P. J. Spangler in July 1967.

DESCRIPTION.— Form: As in X. elaphrinus , although flatter. Easily distinguished from the other two species of the group by the very shallowly im-

pressed rows 7 and 8 of elytral punctulae.

Color: Head and body piceous; dorsal surface shiny and with metallic green luster; appendages piceous.

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

Pronotum ( Figure 39 ): Quadrate (W/ L, 1.36; range 1.33-1.39; 2 specimens); otherwise as in X. elaphrinus .

Elytra: Each elytron with eight serial rows of fine punctulae, all except row 8 effaced before apex; rows 6 and 7 almost effaced throughout; otherwise as in X. elaphrinus .

Microsculpture: As in X. elaphrinus , except almost effaced from elytra and more engraved on head.

Secondary sexual characters: Male genitalia ( Figure 41 ) and female genitalia characteristic of the species group.

Size: Two specimens: length, 3.72-3.76 mm; width, 1.48-1.56 mm.

NATURAL HISTORY.— The two known specimens were collected in July in open country (either near

a small pond or in grassland beneath cow patties), not in association with trees (P. J. Spangler and O. S. Flint, personal communications).

ETYMOLOGY.—I take pleasure in naming this species after my colleague, Paul J. Spangler, who collected the types.

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

CENTRAL AMERICA: PANAMA: Nine miles west of Los Algarrobos, near Rio San Pedro (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.

FIGURES 40, 41.—Male genitalia, left lateral aspect: 40, Xystosomus elaphrinus, Kartabo Point, British Guiana; 41, X. spangleri, 9.0 miles west of Los Algarrobos, Panama.