Perilampus yemenensis Yoo and Darling 2021, n. sp.

Perilampus yemenensis Yoo and Darling n. sp. Figures 10A‒F, 11A‒E, Appendix 1 Material examined. Holotype. “ Yemen: Abyan, Al Kowd, 13°5'0"N, 45°22'0"E, 1-5 Sep 2001, A van Harten; S Al Haruri, Light trap ”, “Digital Image Voucher 2019, Royal Ontario Museum”. The holotype is point-mounted (Female: ROME159199, ROME). Paratype. Yemen: Abyan, Al Kowd, 13°5'0"N, 45°22'0"E: Jul-Sep 2001, A van Harten; S Al Haruri, Malaise trap (1 female: ROME159195 - EAD); (1 male: DCD Slide #2251 ♂ genitalia, ROME159193 - ROME). Etymology. The specific epithet is a reference to Yemen, the only country where specimens of this species have been collected. Description. Length: approximately 1.8‒2.3 mm (HT 2.1 mm). Color: black, scutellum with blue iridescent reflections, dorsellum black with blue reflections. Legs: coxae black, hind femora black or brown, pro and meso femora and tibiae brown, lighter distad and on inner surfaces, with weak blue reflections, tarsi brown. Antennae: scape brown, lighter distad, pedicel and flagellum brown. Head: (Figs 10B, 10C) in frontal view quadrate, slightly wider than high, HW/HH approximately 1.2, sparsely setose to smooth; in dorsal view weakly transverse (Fig. 10B), width same or slightly greater than twice length, HW/HL 2.0–2.1; wider than pronotum, HW/PW approximately 1.3. Frontal carina: absent. Scrobal cavity: shallow; weak round swelling originating from between median and lateral ocelli extend towards eye margin. Ocelli: large; forming a wide triangle, POL about twice distance between posterior and anterior ocelli; POL very long,>2.5× OOL. Vertex: rounded behind; smooth, interocellar region with long groove originating from occiput to anterior ocellus (Fig. 10B, arrow); occiput with median furrow delimited below vertex, with costulae. Outer orbits: smooth, strong costulae behind. Inner orbits: in lateral view, nearly parallel to inner eye margin; smooth. Malar space: short, about 0.2× eye height, MS/EH approximately 0.2; malar sulcus distinct; very weakly coriarious (Fig. 10C). Clypeus: weakly transverse, wider than high, CW/ CH approximately 1.7–1.8, trapezoidal, lateral sulci weak and straight or weakly rounded, weakly divergent; epistomal sulcus straight or weakly concave, same strength as lateral sulci, only slightly extended ventrad; lower margin convex. Supraclypeal area: subquadrate, 0.7–0.8× CH. Antenna: scape length approximately 0.5× EH; anellus length approximately 0.1× PL; F1 subquadrate, shorter than pedicel, F1L/PL approximately 0.6–0.7, F2 subquadrate, F3–F7 transverse; clava 4-segmented, with distinct terminal button. Mesosoma (Figs 10A, 10D, 10E, 10F, 11A): length approximately 1.3× maximum width. Pronotum in dorsal view: short, about 0.25× length of mesoscutum, PN/MSC 0.2–0.3; shorter along midline, 0.5‒0.6× length laterad; anterior margin sharp, the first row of punctures slightly lower; without flange on lateral panel of pronotum at the level of mesothoracic spiracle. Lateral panel of pronotum: slightly wider than prepectus, LPP/PPT approximately 1.2–1.3; flat, with 3 rows of punctures and wide coriarious interspaces dorsad, ventrad with wide coriarious patch; anterior margin slightly rounded; posterior margin ventrad grooved, with row of alveolae. Prepectus (Fig. 10D): narrow; nearly indistinguishable from pronotum, without distinct suture; ventral strap long (Fig. 10D, arrow), with row of alveolae; central area smooth, with foveae along dorsal and posterior margins. Femoral depression: nearly smooth. Midlobe of mesoscutum (Fig. 11A): without transverse tubercle; punctures rounded to weakly angulate, with wide and coriarious interspaces. Lateral lobe of mesoscutum: smooth dorsad; coriarious-punctate laterad. Scutellum: about as long as mesoscutum, SC/MSC approximately 1.1; posterior margin smoothly rounded; punctures rounded to weakly angulate, with wide and coriarious interspaces. Axilla: punctate dorsad, imbricate below. Axillula: short triangular lobe, shorter than width at base, smooth. Propodeum (Fig. 10E): length along midline about 0.3× width of propodeum; submedian area imbricate, with weak groove along median carina; weakly imbricate laterad; plicae incomplete laterad, delimited ventrad by plicae, dorsad by transverse band of foveae; propodeal spiracle margin narrowly foveate ventrad; nucha rugulose. Fore wing (Fig. 10F): postmarginal vein long, 0.8‒0.9× length of marginal vein, 1.4‒1.6× length of stigmal vein; stigmal vein with weak uncus. Metasoma: petiole short with large smooth to weakly rugulose raised scale (10E, arrow); Gt2 smooth, posterior margin weakly concave at middle; Gt3 smooth. Male. Length: approximately 1.7mm. Color, structure, and sculptures similar to female except as follows: Head (Fig. 11B): in dorsal view quadrate. Ocelli: larger. Malar space: shorter, with stronger coriarious sculpture (Fig. 11C). Scape (Fig. 11D): about 0.5× EH; weakly stout, length about 4.7× width above radicle; strongly expanded distad, about 1.2× width above radicle; punctures covering about 0.4× scape length, with slightly wide interspaces. Mesosoma: more elongate, length approximately 1.4× maximum width. Gt3: weakly imbricate dorsad. Aedeagus: with paired lateral spines (Fig. 11K, arrow). Diagnosis. The following combination of characters will distinguish P. yemenensis from the other species of the P. tristis species group: postmarginal vein longer than stigmal vein (Fig. 10F), indistinct suture between prepectus and pronotum (Fig. 10D), strongly imbricate submedian area of propodeum (Fig. 10E), mesonotum with coriarious interspaces (Fig. 11A), weakly bluish iridescence on scutellum, coriarious malar region, which is stronger in male (Figs 10C, 11C), and slightly stout male scape with large punctures covering slightly less than 0.5 scape length (Fig. 11D).

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