Melixanthus menglaensis Duan, Wang & Zhou, 2021

Duan, Wen-Yuan, Wang, Feng-Yan & Zhou, Hong-Zhang, 2021, Two new species of the genus Melixanthus Suffrian (Coleoptera, Chrysomelidae, Cryptocephalinae) from China, ZooKeys 1060, pp. 111-123 : 111

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Melixanthus menglaensis Duan, Wang & Zhou

sp. nov.

Melixanthus menglaensis Duan, Wang & Zhou sp. nov.

Figures 1 View Figure 1 , 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4 , 5 View Figure 5

Type locality.

China: Yunnan Province: Mengla.

Type material examined.

Holotype: male, China: Yunnan Province: Mengla, Menglun, II-IV.1979, coll. unknown (IZ-CAS). Paratypes: China: Yunnan Province: 4 males, 2 females, same data as holotype (IZ-CAS); 1 female, Xishuangbanna, Gannanba, 14.III.1957, coll. Shuyong Wang (IZ-CAS); 1 female, Xishuangbanna, Gannanba, 21.III.1957, coll. Shuyong Wang (IZ-CAS); 1 female, Cheli, 9. IV.1955, coll. Fengyu Xue (IZ-CAS). Vietnam: Tonkin: 4 males, 3 females, III.1937, coll. unknown (IZ-CAS).


BL = 3.25-3.60 mm, BW = 2.02-2.24 mm, HL = 0.91 mm, HW = 0.91 mm, PL = 1.08 mm, PW = 2.02 mm, EL = 2.00 mm, AL = 0.87 mm, AW = 0.27 mm, SL = 0.41 mm.


Body (Fig. 3A-D View Figure 3 ) elongate, almost cylindrical, rounded anteriorly. Head (Fig. 3E View Figure 3 ) yellow, vertex with a darkish brown M-shaped marking; antennae (Fig. 3F View Figure 3 ) with basal 5 segments yellowish brown, terminal 6 segments reddish brown; clypeus yellow; labrum yellowish brown; mandibles darkish brown. Pronotum yellow, with two pitchy brown subtriangular markings along anterior margin. Scutellum yellow and margins black. Elytra pitchy brown, with a yellowish-brown band in middle region, covering about 1/2 of whole region; margins pitchy brown. Sometimes entirely yellow, only margins pitchy brown. Ventral surface yellow, metasternum with a rectangular black marking. Legs and pygidium all yellow.

Head (Fig. 3E View Figure 3 ) densely and coarsely punctate, flattened on midline, longitudinally impressed on frons and vertex. Eyes kidney-shaped, deeply emarginated; antennal insertions a little more widely separated than superior eye-lobes. Clypeus sparsely punctate, strongly arcuate on anterior margin. Antennae (Fig. 3F View Figure 3 ) with sparsely long hair, short and slightly broad, reaching humeral tubercle; 1st segment clubbed; 2nd oblong, about half as long as 1st; 3rd-5th thin, about equal in length, longer than 2nd; 6 apical segments moderately thickened, about 2.0-2.2 times as long as wide, last segment pointed apically.

Pronotum (Fig. 3A-D View Figure 3 ) 1.8 times as wide as long, moderately narrowed and rounded anteriorly; surface strongly convex, impunctate and shining. Scutellum triangular, nearly as long as wide, surface smooth, shining.

Elytron (Fig. 3A-D View Figure 3 ) parallel-sides, apical margin slightly straight, 2.0 times as long as wide, humeri prominent and glabrous. Disc with regular rows of fine punctures, partly confused near apical slope; interspaces without punctures; epipleurae slightly obliquely placed and seen in lateral view.

Ventral side (Fig. 3G View Figure 3 ) partly clothed with pubescence. Prosternum (Fig. 1A, B View Figure 1 ) square, anterior margin slightly concave; basal margin nearly straight, and drawn out into a pair of small denticles. Mesosternum trapeziform, twice as wide as long. Metasternum wrinkled at sutural region and with dense pubescence. Pygidium flat, punctate and pubescent. Claws (Fig. 2A, B View Figure 2 ) not toothed, thickened basally.

Aedeagus (Figs 4A-C View Figure 4 , 5A-C View Figure 5 ) elongate, about 3.2 times as long as wide, clubbed. Apex of median lobe narrower than middle, acute at apex, slightly curved in lateral view; with several pubescence on each side of apex and upper lateral margins, punctate on ventral side of upper middle part. Median orifice with middle sclerite bending inwards above surface. Upper part of median lobe with a pair of sclerotized prominence, exceeding the median lobe. Inner sac rather narrow, arrow-shaped. Tegmen Y-shaped, weakly sclerotized, almost translucent.

Female. Body more robust than male; spermatheca (Figs 4D View Figure 4 , 5D View Figure 5 ) hook-shaped, bent in a right-angle halfway, slightly acute at apex; duct weakly sclerotized, irregularly coiling 9-12 times. Rectal sclerites (Fig. 4E View Figure 4 ) weakly sclerotized, slightly connected between two rectangular sclerites on ventral side.


China (Yunnan); Vietnam (Tonkin).


The specific epithet is derived from the name (Pinyin) of the type locality, Mengla.


This species is similar to M. bimaculicollis Baly, 1865, but can be distinguished from that species in having finer punctures on the head, a narrower pronotum, an impunctate scutellum, and fine puncture rows on the elytra, whereas M. bimaculicollis has the elytra with distinct punctures and a surrounded by dark ring; its claws are not toothed (Fig. 2A, B View Figure 2 ) and the basal margin of its prosternum is drawn out into a pair of small, sharp denticles (Fig. 1A, B View Figure 1 ).