Pectapalochrus Tshernyshev, 2016 - Tshernyshev 2016a: 349.

Body medium-sized, ranging from 2.8 to 4.7 mm in length. Antennae flabellate or strongly serrate, antennomere 2 very small and not conspicuous, antennomere 3 triangular (Fig. 2b). Tarsomere 2 of the fore tarsi bearing a special comb in male (Fig. 2g). Ultimate abdominal ventrite (apical sternite) shortened and divided in both male and female (Fig. 2h, Fig. 3b).

China (new faunistic record: Ningxia), Russia, Mongolia, Armenia.

Apalochrus omega Evers, 1965 - Evers 1965: 149 (type locality: Mongolia).

Flabellapalochrus omega (Evers, 1965): Evers, 1987 - Evers 1987: 59.

Dromanthomorphus omega (Evers, 1965): Wittmer, 1990 - Wittmer 1990: 112; Mayor, 2007 - Mayor 2007: 416.

Pectapalochrus omega (Evers, 1965): Tshernyshev, 2016 - Tshernyshev 2016a: 351.

Apalochrus boops Evers, 1968 - Evers 1968: 33. Synonymized by Evers 1969: 188.

Male. Length of body 3.5–4.7 mm, width at widest part of elytra 1.5–2.3 mm and at the base of elytra 1.2–1.6 mm.

Head capsule black. Antennae yellow to black: antennomere 1 yellow with a dark spot on inner side; 2 entirely yellow; 3–8 yellow to black; 9–11 entirely black. Mouthparts black. Pronotum black. Elytron with variable black and yellow markings, from black with a small yellow spot near apex to yellow with two black stripes at humerus and apical third. Scutellar shield black. Legs yellow to black (Fig. 1a). Ventral surface black. Vesicles yellow. Dorsum with double pubescence consisting of adpressed pubescence and sparse white stiff bristles. Sculptures evenly punctuated, stronger on elytra than on other parts.

Head almost as wide as pronotum (Fig. 1a). Frons flat, interocular area not depressed and lacking protuberances (Fig. 2a). Antennae long and flabellate, projecting beyond middle of elytra; antennomere 1 widened and club-shaped; 2 small and almost completely hidden by 1; 3 enlarged, right triangular; 4–10 serrate to flabellate and almost equal in length; 11 elongate and slender (Fig. 2b). Labial palps with 3 palpomeres, apical palpomere subcylindrical (Fig. 2c). Maxilla with cardo short; palpomere 2 triangular; palpomere 3 small; palpomere 4 cylindrical and robust (Fig. 2d). Clypeus distinct and membranous (Fig. 2e). Mandible robust, with a subapical tooth just behind apical tooth (Fig. 2f).

Pronotum subrounded, lateral sides evenly rounded, anterior margin slightly convex, posterior margin straight, with a distinct transverse depression at base (Fig. 1a).

Scutellar shield small and transverse, with smoothed edges (Fig. 1a).

Elytra subparallel, widened behind the base and evenly rounded at apices, base of elytra distinctly wider than pronotum. Humeri distinct, slightly protruding. Elytral apices evenly rounded (Fig. 1a).

Hind wings normally developed.

Legs slender. Hind femora not reaching elytral apices. All tibiae thin and straight (Fig. 1a). All tarsi with 5 tarsomeres; tarsomere 2 of the anterior tarsi with comb extending over the segment; tarsomere 5 longest and tarsomere 4 shortest in all legs. Claws long and sharp, with small rounded bases (Fig. 2g).

Metathorax simple, lacking appendages. Pygidium transverse, with almost straight distal side (Fig. 2i). Ultimate abdominal ventrite bilobed, short and transverse (Fig. 2h). Tegmen elongate; aedeagus wide, approximately parallel-sided for basal 2/3 in ventral view, then slightly narrowing to blunt apex; endophallus with two rows of small spines (Fig. 2j–k).

Female. Length of body 3.5–4.6 mm, width at widest part of elytra 1.6–2.2 mm and at the base of elytra 1.1–1.6 mm.

Similar to male species, except for antennae short and serrate, fore-tarsi lacking comb, pronotum with an inconspicuous transverse depression at base (Fig. 1b).

Pygidium sub-trapezoid with apical margin almost straight (Fig. 3a). Ultimate abdominal ventrite divided, with long spiculum ventrale (Fig. 3b). Ovipositor elongate and membranous (Fig. 3c).

This species is similar to P. pectinicornis (Erichson, 1840) in entirely black pronotum and yellow to black antennae and legs, but can be distinguished from the latter by the elytra with variable black and yellow markings, antennomere 3 scalene triangular in male and subcylindrical in female (Fig. 1, Fig. 2b). In P. pectinicornis, elytra are black with wide yellow rounded spots at apices, antennomere 3 is equicrural triangular in male and triangular in female (Tshernyshev 2016a).

China (Ningxia); Mongolia (Fig. 4).