Chelyolygus wolskiorum, Yasunaga, 2024

Chelyolygus wolskiorum , new species

( Figs. 1 View Fig G−H, 3A−F, 23)

Type material. Holotype: male, THAILAND: Nakhon Ratchasima, Wang Nam Khiao, Sakaerat Environmental Research Station, 14°30′27″N, 101°55′39″E, 410 m alt., UV lighting, T. Yasunaga , 16 September 2008 ( AMNH _ PBI 00380777 About AMNH ) ( DOAT) GoogleMaps . Paratypes: THAILAND: Chiang Mai, Doi Suthep, Chiang Khian, Chiang Mai Univ. Exp. Forest , 18°50′N 98°54′E, light trap, S. Nagashima, 8–11 May 2000 ( TYCN) GoogleMaps ; 2 females, Nakhon Ratchasima, Wang Nam Khiao, Sakaerat Silvicultural Research Station , 14°27′49.1″N, 101°52′15.3″E, sweeping inflorescence of a broadleaf tree, T GoogleMaps . Yasunaga , 26 September 2013 , 1 female developed from 5th instar nymph and emerged on 27 September 2013 ( TYCN, ZRC) ; 1 female, Nakhon Ratchasima, Wang Nam Khiao, Sakaerat Environmental Research Station , 14°30′27″N, 101°55′39″E, 410 m alt., UV GoogleMaps lighting, T. Yasunaga , 24 January 2009 ( TYCN). VIETNAM : 1 male, Ha Tay Prov. , Ba Vi, T . Ishikawa , 29 July 2000 ( TUAK) .

Diagnosis. This new species is recognised readily by the following characters: Pale reddish brown (male)/ ivory brown (female) general colouration ( Fig. 7A, B View Fig ); small size; darkened apex of clypeus; annulated antennomere I; dark, short stripes along veins on hemelytron; circular spot on mesial cuneus; and semi-circular dorsal structure and narrow, less-spinulate, subtriangular interramal lobe on posterior wall.

Description. Body generally pale reddish brown (male)/ ivory brown (female) ( Fig. 7A, B View Fig ), ovoid, small; dorsal surface shining, impunctate. Head shiny pale brown, with sparsely distributed, semi-erect setae; apical half of clypeus fuscous; vertex with basal transverse carina about as thick as pronotal collar ( Fig. 23B View Fig ). Antenna dark brown; antennomere I pale, with dark apex, sometimes weakly darkened at middle; antennomere II with pale basal ⅓ and more or less darkened base, longer than labium; extreme base of antennomere III creamy yellow. Labium shiny pale brown, reaching but not exceeding apex of metacoxa; apical half of segment IV reddish brown. Pronotum shining, uniformly pale brown, impunctate, with sparsely distributed, short, reclining setae ( Fig. 23A, B View Fig ); calli sometimes with a pair of dark spots; pleura pale brown; metathoracic scent efferent system creamy yellow, with small, semi-circular peritreme ( Fig. 23D View Fig ); scutellum polished, with dark apex and a dark, narrow, mesal stripe in male ( Fig. 7A View Fig ) or brown faint line in female ( Fig. 7B View Fig ), impunctate, with uniformly distributed, short, semi-erect setae. Hemelytron shining, with unique striped pattern as in Figs. 1G View Fig , 5A, B View Fig , with uniformly distributed, semi-erect or reclining setae ( Fig. 23A, E View Fig ); cuneus usually with a dark, circular spot; membrane smoky brown. All coxae and legs pale brown; trochanters brown; each tarsomere III dark brown; pretarsal structures as in Fig. 19G View Fig ; parempodia relatively long, lanceolate. Abdomen pale brown, partly infuscate. Male genitalia ( Figs. 3 View Fig A−D, 23H–K): Left paramere stout, C-shaped, with thick hypophysis ( Figs. 3B View Fig , 23I View Fig ); right paramere with short, tapered hypophysis ( Fig. 3C View Fig , 23J View Fig ). Vesica with two long, stout, weakly curved spicules ( Fig. 3D View Fig , 23K View Fig ). Female genitalia ( Figs. 3E, F View Fig , 23L–O View Fig ): Genital chamber narrow, with elongate-oval, thin-rimmed sclerotised rings that are relatively contiguous to each other mesally ( Fig. 3E View Fig ); posterior wall simple, with a row of spines along posterior margin of interramal lobes and anterior interramal sclerite ( Figs. 3F View Fig , 23N, O View Fig ); dorsal structure small, sack-like; interramal lobes narrow, subtriangular, situated near lateral margins.

Measurements. See Table 1.

Etymology. Named after my Polish colleague and friend, Andrzej Wolski (who regrettably passed away in May 2024) and his wife Tamara; I was able to collect much material and confirm the immature forms of this new species while performing fieldwork in central Thailand with Andrzej and Tamara.

Distribution. Thailand (Chiang Mai, Nakhon Ratchasima), Vietnam (Ha Tay).

Biology. A female adult ( Fig. 7B View Fig ) and final instar immature form ( Fig. 7C View Fig , successfully developing into an adult female in captivity) were captured by sweep-netting the inflorescences of an undetermined evergreen broadleaf tree (possibly Dipterocarpaceae ). Some adults (including the holotype male) were occasionally attracted to UV light at night.