Figures 9, 14I–L, 18E, F, 22

Arthriticus Bergroth, 1923: 413 (gen. nov.; type species Arthriticus eugeniae Bergroth, 1923 by monotypy); Carvalho, 1952: 59 (cat.); Carvalho, 1955: 38 (key to gen.); Carvalho, 1957: 132 (cat.); Schuh, 1995: 509 (cat.); Schuh, 2002 –2013 (cat.).

Diagnosis: Arthriticus belongs to the Monalonion - complex (see discussion for tribe) and among the genera of this group it be recognized by: elongate body and appendages (Fig. 9), ASI and femora distinctly swollen apically; ASI longer than head and pronotum combined; frons not swollen on only slightly convex (as in Fig. 10J); distance between antennal fossa longer than antennal fossa width; antenna distinctly longer than body; forefemur curved; scutellum without spine-like projection; claw broadly rounded (fig. 10C in Namyatova & Cassis, 2013b); sclerotized part of phallotheca wide basally and distinctly tapering apically (Fig. 14I); DLP with two sclerotized bands (Fig. 18E).

Redescription: Male: Length c. 5 mm. COLORATION (Fig. 9). Body mostly red, with brown markings, mostly on appendages. TEXTURE. Body mostly smooth, without punctures, wrinkles and tubercles; vertex without flattened areas; semicircular depression between scutellum and mesoscutum absent; striations on scutellum laterally absent; only single depression at each side of scutellum anteriorly, present (as in fig. 9H in Namyatova & Cassis, 2013b). VESTITURE. Setae on dorsum and thoracic pleura absent; pale simple setae on clypeus, labium, appendages and abdomen present; setae on lateral margins of head, labium and abdomen mostly adpressed and short, setae on abdomen very rare, present apically only; setae on antenna mostly short, suberect or adpressed, sometimes setae on ASII longer than width of hind tibia; setae on femora present only apically, adpressed; setae on tibiae short, mostly spine-like, suberect, not very dense; apex of tibia and tarsi with adpressed short setae; black spinules on femora and tibiae absent. STRUCTURE. Head. Distance from eye and pronotum slightly shorter than eye diameter (as in Fig. 10J); occipital region not delimited by transverse depression; longitudinal depression distinct, almost as long as or longer than eye diameter; eyes not stylate, in line with contour of head, c. 0.25× as long as head width (as in Fig. 10J); distance between antennal fossa longer than antennal fossa diameter; frons slightly convex, without ridges, outgrowths or longitudinal depression; anterior view of head c. 1.3× wide as high; eye height c. 1.5× as long as distance between eye and apex of clypeus; antennal fossa oval c. 0.7× as long as eye height, not raised, inferior margin placed distinctly above inferior margin of eye; base of clypeus placed slightly below than margin of antennal fossa, basally not delimited with depression; head more or less swollen in lateral view; gula c. 2–3× as long as buccula, convex. Labium. Length slightly surpassing posterior margin of metasternum; LSI twice as long as wide; LSII c. 3× as long as wide, subequal to LSI; LSIII c. 3× as long as wide, subequal to LSII; LSIV c. 6× as long as wide, twice as long as LSIII. Antenna. About 1.8× as long as body; ASI c. 2.3× as long as head width, swollen apically; ASII c. 1.7× as long as ASI, c. 2.5× as long as head and pronotum combined; ASIII 0.8× as long as ASII; ASIV c. 0.5× as long as ASIII; ASII–IV filiform. Thorax. Collar slightly swollen (as in fig. 7A in Namyatova & Cassis, 2013b), faintly delimited posteriorly; calli separated, almost flat; depression delimiting calli posteriorly absent (as in Fig. 10J); humeral angles of pronotum rounded, not dilated; posterior margin of pronotum straight or slightly concave (as in Fig. 10J); scutellum flat, rounded apically; without outgrowth, ridge or medial depression; metepimeron narrow, c. 2.5–3× as high as long, with subrectangular outgrowth (as in Fig. 13A); metasternum rounded posteriorly, without medial projection on to abdominal segment II (as in fig. 17B in Namyatova et al., in press). Hemelytron. Costal margin concave or straight; claval commissure c. 2.3× as long as scutellum, concave (as in fig. 11G in Namyatova et al., in press); R + M distinct, reaching posterior margin of corium; medial fracture subparallel to R + M (as in fig. 11G in Namyatova et al., in press); corium without swelling posteriorly; cuneus c. 5× as long as wide, subequal to pronotum, medial margin distinctly concave (as in fig. 13C in Namyatova et al., in press); membrane cell distinctly surpassing apex of cuneus, c. 1.75× as long as pronotum, acute apically (as in fig. 14C in Namyatova et al., in press); short auxiliary vein present; distance between cell and apex of membrane c. 0.14× as long as cell. Legs. Forecoxae separated (as in fig. 17B in Namyatova et al., in press); femora distinctly swollen apically and medially, apically as wide as eye, curved; foretibia longer than head and pronotum combined; swelling on tibiae absent; segment I of hind tarsus distinctly longer than segment II, segment II and III subequal in length (as in fig. 19B in Namyatova et al., in press); claw broadly rounded (fig. 10C in Namyatova & Cassis, 2013b); basal teeth short and triangular (as in fig. 10B in Namyatova & Cassis, 2013b). Genitalia (Fig. 14I–L). Genital capsule slightly longer than wide, with ventral wall shortened anteriorly (as in Fig. 15Q); left paramere r-shaped, twice as long as right paramere; phallobase sclerite of primary gonopore subtriangular, concave, without outgrowth(s); ductus seminis slightly longer than phallotheca, with coils, forming broad tube, without sclerotization basally or apically, attached to phallobase medially; sclerotized part of phallotheca broad basally and tapering apically; endosoma with pair of symmetrical elongate spicules.

Female: Length c. 6–7 mm. Coloration, surface, vestiture and structure as in male, but body generally larger (Fig. 9). Genitalia (Fig. 18E, F). DLP membranous, with two narrow sclerotized bands, some striations present; lateral oviduct placed slightly anteriorly to midline of DLP, close to lateral margin of DLP; spermathecal gland shifter anteriorly from midpoint; posterior wall of bursa copulatrix with distinct tubercles, without outgrowths or sclerotization; base of second valvula with swelling; ventral wall with sclerites around vulva.

Distribution: Bogor (Indonesia) (Fig. 22).

Host plants: Known from Eugenia sp. (Myrtaceae) (Bergroth, 1923).