Xestocoris tibialis, O’Donnell, Jane E., 2007

O’Donnell, Jane E., 2007, A new species of Xestocoris Van Duzee, with comments on the genus (Hemiptera: Heteroptera: Rhyparochromidae: Rhyparochrominae), Zootaxa 1606, pp. 51-57 : 54-57

Xestocoris tibialis , new species

Figures 1, 3, 4 –7.

The following description is of the Holotype; measurements of the female paratype are given in parentheses following the corresponding measurement of the male holotype.

Elongate, body widest at level of apex of clavus; brachypterous. Dorsal surface polished, densely covered with long, upstanding cream color hairs. Total body length 3.0 (3.44). Head, disk of pronotum, scutellum, visible terga and all of venter chestnut, shining, becoming tinged with amber on tylus, anterior and posterior pronotal margins, acetabula, and posterior metapleural lobe. Antennae, labium, femora, and mid and hind tibiae amber; fore tibia lighter, approaching cinnamon color of most of hemelytron; hemelytron fading to near cream color laterally.

Head: quadrate, strongly and abruptly declivent; eyes small, protuberant; ocelli reduced. Tylus as broad as apex of first antennal segment. Venter swollen on either side of labium, heavily punctate. Length head 0.50 (0.52); preocular length 0.33 (0.40); length eye 0.14 (0.14); width across eyes 0.68 (0.72); interocular width 0.48 (0.50). Antennae with first 2 segments fusiform, third and fourth terete; first segment exceeding tylus by one-half its length. Length antennal segment I 0.40 (0.48); II 0.58 (0.58); III 0.43 (0.44); IV 0.50 (0.54). Labium reaching hind coxae, first segment not reaching base of head. Length labial segment I 0.45 (0.50); II 0.45 (0.48); III 0.33 (0.34); IV 0.28 (0.30).

Thorax: Pronotum quadrate, anterior margin slightly concave, posterior margin straight; lateral margins subcarinate, only slightly sinuate, trichobothrium present. Anterior lobe occupying most of pronotum; calli impunctate; transverse impression shallow; reduced posterior lobe with sparse shallow punctures. Length pronotum 0.53 (0.60); width across trichobothria 0.70 (0.76); posterior width 0.88 (0.94). Scutellum with sparse coarse punctures, nearly flat, without a y-shaped impunctate elevation. Length scutellum 0.53 (0.56); width 0.50 (0.54). Hemelytron coarsely punctate, brachypterous (nearly coleopteroid), exposing abdominal terga 6 and 7; claval-corial suture obsolete, membrane present only as a small triangular flap, without veins. Length of "extended" claval commissure 0.48 (0.56). Mesepimeron almost emergent; evaporative area not reaching dorsal margin of mesopleuron; metathoracic scent gland auricle strongly raised, comma-shaped, evaporative area occupying slightly more than one-half of metapleuron, curving in a broad arc from edge of mesopleural evaporative area to where it meets meta-acetabulum posteriorly, not extending to dorsal margin of metapleuron along meso-metapleural suture. All femora about equally swollen and densely hairy; fore femur with 5 right (4 left) stout spines; mid and hind femora mutic; fore tibia greatly expanded, wider than femur, inner surface with a longitudinal groove and a proximal depression ( Figure 3 ); spines lacking on fore tibia, but outer surface covered with long semi-erect hairs; mid and hind tibiae with spines reduced, shorter than width of tibia and confined mostly to inner surfaces.

Abdomen: Exposed terga covered with long upstanding hairs; venter polished; all sterna with long upstanding cream color hairs and minute, appressed, iridescent scale-like hairs. Male genital capsule ( Figures 4 , 5) covered with long hairs dorsally (surrounding genital opening) (not shown on Figure 5); clasper (Figure 6) strongly concave on inner surface; outer projection heavily sclerotized and covered with long hairs (not shown on drawing); sperm reservoir (Figure 7) with basal spur; arcuate extension split basally, with large opening; sleeve with strongly sclerotized band distally.

Holotype: male: Mt. Wrightson, Sta. Rita Mts., ARIZ. Sept. 11, 1961, F. Werner & Nutting Summit 9453'. Deposited in SNOW.

Paratype: 1 female same data as holotype. Deposited in SNOW.

Etymology: Named for the characteristic, greatly expanded fore tibia of the male.

Distribution: Known only from the type locality in Arizona.

Figures

FIGURE 1, 4 – 7. 1, Left foreleg of holotype of Xestocoris tibialis; scale line = 0.25 mm; 4, Genital capsule of holotype of Xestocoris tibialis, lateral view; scale line =. 25 mm; 5, Genital capsule of holotype of Xestocoris tibialis, dorsal view (hairs omitted); scale line = 0.25 mm; 6, Left clasper of holotype of Xestocoris tibialis, inner view; scale line = 0.10 mm; 7, Sperm reservoir of holotype of Xestocoris tibialis, lateral view; scale line = 0.10 mm.