Comprehensive Description
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англиски
)
добавил Smithsonian Contributions to Zoology
Xystosomus anterocostis
TYPE-LOCALITY.—Hamburg Farm at Reventazón, Costa Rica.
TYPE-SPECIMENS.—The holotype male, allotype, and one female paratype are in USNM. All were collected by Nevermann.
DESCRIPTION.—Form: As in X. gruti, except elytra slightly more convex. Easily distinguished among the “smooth elytra-convex interval” group of species by the sinuate sides of the pronotum.
Color: Head and body piceous; pronotum and elytra moderately iridescent; appendages testaceous or slightly infuscated.
Head: Broad between eyes; frontal furrows deeply impressed, almost sulcate; eyes large and prominent.
Pronotum (Figure 14): Transverse (W/L, 1.63; range, 1.53–1.75; 3 specimens); otherwise as in X. gruti, except side margins sinuate at basal third.
Elytra: Striae 5–8 well impressed and punctulate; intervals convex, at least in basal third; disc with four rows of faintly impressed punctulae, each well separated from the other, intervals flat; side margins broadly explanate; humeral projection well developed, blunt; chaetotaxy as in X. gruti; plica small, evident externally.
Microsculpture: As in X. gruti.
Secondary sexual characters: Male genitalia (Figure 31) and female genitalia characteristic ol the species group.
Size: Three specimens: length, 3.3–3.6 mm; width, 1.6–1.8 mm.
NATURAL HISTORY.—F. Nevermann collected two specimens on “wilted foliage of Quararibae turbinata, October” (Bombacaceae) and one specimen “on dry leaves, September.” No teneral specimens seen.
LOCALITY RECORDS (Figure 69).—I have seen three specimens from the following locality:
CENTRAL AMERICA: COSTA RICA: Hamburg Farm at Reventazón (USNM).
