Xystosomus iris, 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 : 11

publication ID

https://doi.org/ 10.5479/si.00810282.140

DOI

https://doi.org/10.5281/zenodo.3848477

persistent identifier

https://treatment.plazi.org/id/61278799-FFE1-FF80-DCCC-F90BFA1F4FDE

treatment provided by

Plazi

scientific name

Xystosomus iris
status

sp. nov.

5. Xystosomus iris View in CoL , new species

FIGURES 10 View FIGURES 7-21 , 27, 69

TYPE-LOCALITY.— Monson Valley, Tingo Maria , Peru.

TYPE-SPECIMENS.—The holotype male and allotype are in CAS . Both were collected by Schlinger and Ross in 1954. Four paratypes from Bolivia: MHNP, 2; USNM, 2.

DESCRIPTION.—Form: As in X. strigosus, except pronotum much narrower. Narrowest species in the group in relation to head width. Easily distinguished from all species of the group by the doubled back recurrent groove which forms a large loop.

Color: Head and body rufopiceous; pronotum and elytra with slight metallic green luster; elytra also strongly iridescent; appendages testaceous; antennae slightly infuscated apically.

Head: Narrow between eyes; frontal furrows moderately impressed; eyes large and prominent.

Pronotum ( Figure 10 View FIGURES 7-21 ): Quadrate (W/L, x 1.46; range, 1.44-1.57; 6 specimens), only slightly wider than head across eyes; hind angles about 90°, side

margins anterior to angles slightly sinuate; side margins narrowly explanate basally, beaded anteriorly.

Elytra: Striae 1-8 of each elytron well impressed and punctulate; punctures moderately large and separated by about twice their own diameter; recurrent groove doubled back into a deeply impressed elliptical loop; humeral projection well developed, sharply acute (oblique view); chaetotaxy as in X. gruti ; plica short, evident externally.

Microsculpture: As in X. gruti .

Secondary sexual characters: Male genitalia (Figure 27) and female genitalia characteristic of the species group.

Size: Six specimens: length, 3.0-3.6 mm; width, 1.4-1.7 mm.

NATURAL HISTORY.— Unknown, except adults collected in March (Bolivia) and October (Peru). No teneral specimens seen.

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

SOUTH AMERICA: BOLIVIA: Cochabamba (MHNP); Ca- chuela Esperanza (USNM). PERU: Monson Valley, Tingo Maria ( CAS ).

CAS

USA, California, San Francisco, California Academy of Sciences

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Carabidae

Genus

Xystosomus

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