Perittopus trizonus Ye & Bu, sp. n.

(Figs. 3, 6, 8, 11, 13, 16, 19, 22, 25, 29, 31, 32)

Type material. Holotype: apterous female, THAILAND, Nong Bua Lamphu Province, Na Klang (17°24'N, 102°10'E), 13 August 2018, Zhen Ye leg. (NKUM). Paratypes: 1 male, apterous, 1 female and 1 male, macropterous, same data as holotype (NKUM).

Diagnosis. P. trizonus sp. n. is similar to P. zimmermannae Zettel, both having three infuscated zones on the pronotum (see Fig. 6 in Zettel, 2011 and Figs. 8, 13). However, P. trizonus sp. n. can be distinguished by the distinguishing color pattern (i.e., for macropterous forms, medial part of pronotum with a linear blackish mark, lateral part of humeral corners with pair of blackish marks, Figs. 8, 13); by the mediotergites without any infuscated marks in apterous male (Fig. 11); and by the distinct differences in the structure of the paramere [i.e., relatively broad basal part and slender, narrow, helicoid distal part, apex slightly blunt (Fig. 29)].

Description of apterous female (Figs. 3, 6). Color: ground color reddish, head reddish, labrum brownish, with buccula orange, rostrum yellowish with black apex; antennal segments I–IV shining black; pronotum reddish, medial part with a distinctly elongate blackish mark, lateral part of humeral corners with pair of infuscated marks (Fig. 6), area behind head along anterior margin of pronotum with a row of dark punctures, posterior part of pronotum with scattered slightly dark punctures; legs mainly blackish brown, basal part of femora dull orange, tibiae and tarsi blackish brown; abdominal dorsum dull red without any blackish marks (Fig. 6); abdominal venter orange. Structural characteristics: body length 2.90, medium-sized, rather stout, bearing short, blackish, appressed pubescence and dorsum anteriorly and laterally covered by suberect and thick hairs; head deflected, head length: 0.32, head width: 0.70, about 2.19 times head length, hind margin of head laterally and ventrally with some black peg-like spiculae; antennae relatively short and stout, about 0.43 times as long as body, lengths of antennal segments I–IV: 0.33, 0.27, 0.29, 0.37; pronotum length: 1.12, pronotum width: 1.20, hind margin of pronotum broadly rounded, medially reaching basal third of mediotergite II, lateral part of pronotum medially with distinct constriction (Fig. 6), posterior part distinctly wider than anterior part, mesonotum and metanotum completely hidden beneath pronotal lobe except laterally, prosternum anteromedially with one row of black peg-like spiculae; legs mainly with decumbent, suberect and blackish hairs, tarsi of fore leg short and incrassate, tarsi of middle and hind legs long and slender, lengths of leg segments (femora, tibiae, and tarsi): fore leg: 0.64, 0.65, and 0.30 (0.04 + 0.26), middle leg: 0.84, 0.92, and 0.86 (0.28 + 0.29 + 0.29), hind leg: 0.90, 1.17, and 0.64 (0.10 + 0.23 + 0.31); mediotergites not flat, areas after mediotergite IV slightly depressed, connexiva strongly raised and moderately convergent (Figs. 6, 16); mediotergites I–III with short, sparse hairs; mediotergites IV–VI almost bare, hind margin of mediotergite VII–VIII with relatively short, posterodorsad-directed blackish hairs, connexiva VI–VII with rather dense, relatively long, posterodorsad-directed black hairs, connexiva VIII with dense, blackish hairs in caudal aspect (Figs. 16, 19). Genital segments: gonocoxa I platelike and exposed; proctiger small, directed posteriad, with dense, short hairs.

Description of apterous male (Fig. 11). Similar to apterous female in general structure and coloration with following exceptions: body slightly slender, body length 2.85; head length: 0.28, head width: 0.68, about 2.43 times head length, antennae about 0.46 times as long as body, lengths of antennal segments I–IV: 0.32, 0.29, 0.30, 0.40; pronotum length: 1.08, pronotum width: 1.18, medial part of pronotum with a distinctly elongate blackish mark, lateral part of humeral corners with pair of infuscated marks (Fig. 11); lengths of leg segments (femora, tibiae, and tarsi): fore leg: 0.63, 0.65, and 0.30 (0.04 + 0.26), middle leg: 0.88, 0.96, and 0.87 (0.28 + 0.29 + 0.30), hind leg: 0.95, 1.20, and 0.60 (0.08 + 0.20 + 0.32), grasping comb relatively long, about 0.46 times fore tibiae length; mediotergites almost flat without any infuscated marks (Fig. 11), connexiva narrow, slightly raised, weakly convergent, all mediotergites and laterotergites with sparse and long blackish hairs, connexiva VI–VII without cluster of dense hairs (Fig. 11); abdominal segment VIII (Fig. 22) about 1.50 times as long as wide, with dorsal hind margin concave, pygophore and proctiger simple, proctiger about 3.18 times as long as wide (Fig. 25), paramere with relatively broad basal part and slender, narrow, helicoid distal part, apex blunt (Fig. 29).

Description of macropterous female (Fig. 8). Similar to apterous female in general structure and coloration with following exceptions: body relatively large, body length 3.22 (including fore wing); head length: 0.30, head width: 0.71, about 2.26 times head length, antennae about 0.42 times as long as body, lengths of antennal segments I–IV: 0.37, 0.28, 0.30, 0.41; pronotum length: 1.40, pronotum width: 1.50, pronotum with a constriction in front of humeral corners, medial part of pronotum with a linear blackish mark, lateral part of humeral corners with pair of blackish marks (Fig. 8); lengths of leg segments (femora, tibiae, and tarsi): fore leg: 0.66, 0.66, and 0.31 (0.04 + 0.27), middle leg: 0.90, 0.97, and 0.91 (0.30 + 0.28 + 0.33), hind leg: 1.00, 1.31, and 0.61 (0.09 + 0.21 + 0.31); forewings mainly blackish brown, slightly surpassing tip of abdomen, laterally adjacent to medial edge of raised connexiva, hemelytron with thick corium with two closed cells, veins adjacent to raised connexiva reddish with short, suberect and black hairs.

Description of macropterous male (Fig. 13). Ground color as in macropterous female; body length 3.08 (including fore wing); structure of head including antennae as in female, head length: 0.25, head width: 0.70, about 2.80 times head length, antennae about 0.43 times as long as body, lengths of antennal segments I–IV: 0.32, 0.29, 0.31, 0.41; pronotum length: 1.36, pronotum width: 1.43, medial part of pronotum with an indistinctly linear blackish mark (Fig. 13); lengths of leg segments (femora, tibiae, and tarsi): fore leg: 0.68, 0.66, and 0.33 (0.04 + 0.29), middle leg: 0.90, 1.00, and 0.95 (0.28 + 0.33 + 0.34), hind leg: 1.07, 1.36, and 0.64 (0.08 + 0.24 + 0.32); grasping comb relatively long, about 0.36 times fore tibiae length; other characters as in macropterous female.

Etymology. The specific name “ trizonus ” refers to the three infuscated zones on the pronotum.

Habitats: Specimens of P. trizonus sp. n. have been collected in an artificial pond near a clear, fast-flowing forest stream (Fig. 31).

Distribution. Thailand (Nong Bua Lam Phu) (Fig. 32).