Paratrichius tergorufus Ricchiardi, 2019

Ricchiardi, Enrico, Bai, Ming & Li, Sha, 2019, Description of three new species of Paratrichius Janson, 1881 from China and revision of the distribution range of Paratrichius rubrodecoratus (Tesař, 1952) (Coleoptera: Scarabaeidae: Cetoniinae: Trichiini), Zootaxa 4700 (3), pp. 345-355 : 348-349

Paratrichius tergorufus Ricchiardi , new species

( Figs. 2 A–M)

Type material. Holotype: ♂ ( IZAS), Guangxi, Jinxiu, Mt. Dayaoshan , 1100 m, May 2018, local collectors. Allo- type: ♀ ( ERC), Guangxi, same data as holotype but May 2016 . Paratypes (altogether 63 specimens). Guangxi : 1♂ ( NHM) , 1♂ ( IZAS), Jinxiu, Huawangshanzhuang , 600 m, 20 May 1990, Yuan Decheng legit ; 14♂♂, 5♀♀ ( ERC) , 1♀ ( IZAS), Jinxiu, Mt. Dayaoshan , 1100 m, May 2017, local collectors ; 1♀ ( ERC), Pingban, Jinxiu, Mt. Daya- oshan, 1200 m, 15/ 25-May 2014, Zhao Jin-Sheng legit ; 1♂ ( ERC), Pingban, Jinxiu, Mt. Dayaoshan , 1200 m, 13/ 15 May 2013, Huang-Shun Xi legit ; 1♂ ( ERC), Jinxiu, Mt. Dayaoshan , 1100 m, May 2016, local collectors ; 2♂♂, 1♀ ( ERC), Pingban, Jinxiu, Mt. Dayaoshan , 1200 m, 25 April / 7 May 2014, Jin-Sheng Zhao legit ; 2♂♂, 1♀ ( ERC), Pingban, Jinxiu, Mt. Dayaoshan , 1200 m, 25 April / 7 May 2014, Jin-Sheng Zhao legit ; 2♂♂ ( QCCC), Mount Dam- ingshan, Wuming County, 720 m, 25 May 2013, Yan-Quan Lu legit ; 1♂ ( QCCC), Mount Damingshan , Wuming County, 650 m, 20 May 2013, Yan-Quan Lu legit ; 1♂ ( QCCC), Yinshan Park , Jinxiu County, 17 July 2015, Lu Qiu legit ; 4♂♂, 2♀♀ ( QCCC), Mount Dayaoshan , Jinxiu County, 7 May 2015, Jin-Teng Zhao legit ; 1♀ ( QCCC), Mount Dayaoshan , Jinxiu County, 1300 m, 2 June 2014, Jin-Teng Zhao legit ; 2♂♂, 2♀♀ ( QCCC), Mount Dayaoshan , Jinxiu County, 1110 m, 21 May 2014, Jin-Teng Zhao legit ; 1♂ ( QCCC), Mount Dayaoshan , Jinxiu County, Apr 2014, Jin-Teng Zhao legit ; 1♀ ( QCCC), Mount Dayaoshan , Jinxiu County, June 2011 ; 2♂, 2♀ ( QCCC), 18.V.2017, Daojiang, Changdong, Jinxiu County, Guangxi, 910 m, Wen-Yong FENG leg. Guizhou : 3♂♂, 2♀♀ ( QCCC), Mao- lan Natural Reserve , Libo County, 11/ 17 June 2018, Jian-Yue QIU & Hao Xu legit ; 1♀ ( QCCC), Maolan Natural Reserve , Libo County, 23 July 2013, Jian-Yue QIU & Hao Xu legit ; 3♂♂, 1♀ ( GFGY), Maolan Natural Reserve, Dongduo , Libo County, 650 m, 27 May 1988. Fujian : 1♂ ( QCCC), Mount Mangdangshan, Nanping , 5 June 2014, Peng-Yu Liu legit .

Description of holotype (♂). Length: 10.2 mm, elytral width: 5.8 mm.

General appearance. Elongate, with slender legs and as in Figs. 2 A–C.

Head ( Fig. 2D ). Black, clypeus fulvous, without chalky material. Antennae dark brown, with clubs fulvous. Clypeus glabrous, wider than long, widest at one third of apex, anterior corners rounded, anterior margin emarginate, not reflexed at centre, sparsely punctate anteriorly. Frons and vertex sparsely punctuate, glabrous. Antennal clubs long, about 1.7 times the clypeus length.

Pronotum ( Fig. 2A ). Octagonal, slightly wider than long, moderately convex, not longitudinally hollow at cent- er of disk, sides abruptly converging anteriorly before middle, almost parallel from middle to base, widely rounded posteriorly, anterior angles obtuse, rounded at apex, posterior angles rounded and not projecting posteriorly, posterior margin broadly emarginated medially; lateral and posterior margins with narrow band of chalky material interrupted at center of posterior margin. Margins with scattered, pale yellow setae, becoming thicker near the corners; surface with thick, rounded, small punctuation, covered with black pruinosity.

Scutellum . Black, triangular, wider than long, sides arcuate, apex rounded, surface black and sparsely punctate.

Elytron ( Fig. 2A ). Black, with reddish, narrow, longitudinal maculae on anteapical umbones. Longer than wide, widest before the middle, with seven striae, six dorsally, one on lateral declivity; with following chalky material: four rounded patches on disk, two on lateral declivity and short band in juxtascutellar part of sutura.

Pygidium ( Fig. 2E ). Black, wider than long, shiny with apex rounded; with comma-shaped chalky patches at sides, separated dorsally from each other by narrow gap. Covered with erect, whitish setae and scattered, shallow punctuation.

Ventral side ( Fig. 2C ). Greater part of ventral surface covered with chalky material. Anal sternites hollow at center, but still covered with chalky material.

Legs. Completely black apart from brown protarsi. Protibia bidentate, lacking terminal spur. Metatibial posterior margin with obsolete, small tooth at center. First metatarsomere slightly longer than second. Metatarsomeres with some whitish-yellow bristles tufts at apex ( Figs. 2 A–C).

Male genitalia. As in Figs. 2 F–H.

Allotype (♀) differs from male by the following characters ( Figs. 2 I–M). Length: 10.6 mm, elytral width: 5.6 mm. Slightly more robust than male and completely black, without red maculae or black pruinosity. Protibia wider than in male. Antennal club about 1.2 times the clypeus length. Pygidium with longitudinal, central, notable hollow from mid to apex ( Figs. 2 J–K and 2M), with pale yellow chalky material not covering small central transversal, carina-like area and band along posterior margin as well as apex ( Fig. 2M ). Anal sternites not hollow medially and without pale yellow chalky material.

Type series variability. This species exhibits constant characters, but is somewhat variable in its dimensions, with body length in the range of 9.8–11.7 mm in males and 9.8–10.6 mm in females.

Distribution. Guangxi, Guizhou and Fujian provinces, China.

Etymology. From the Latin “tergorufus”, as the anteapical umbones of the male are reddish

Differential diagnosis. The only other Chinese species of Paratrichius with black colouration and red or orange-red maculae on elytra but no chalky material on disc of pronotum is Paratrichius rufescens Ma, 1990 , known from Hainan and Fujian. The male of the latter species can be separated from that of P. tergorufus new species mainly by its pygidium, which is completely covered with chalky material and effaced at apex. It also has a broad red orange band on its elytra and the antennal clubs are fulvous instead of black. The shape of its parameres is very peculiar too.

The female of P. tergorufus new species is completely black and only rarely exhibits a reddish macula around the anteapical umbones. It can easily be separated from similar species by the peculiar shape of its pygidium ( Fig. 2M ). Paratrichius tergorufus new species could also be confused with Paratrichius hajeki Krajcik, 2010 , described from northern Vietnam but inhabiting north-eastern Laos too and potentially occurring in southern Yunnan and/or other areas of south-western China. The male of P. hajeki differs from that of P. tergorufus new species by having a black clypeus and an orange red macula on elytra, instead of red (seldom this macula is stretched forward). It also exhibits a band of chalky material along its anterior and lateral margins, which is continuos rather than interrupted at the center. The female of P. hajeki can be separated from that of P. tergorufus new species by its pygidium, which exhibits a short, narrow, longitudinal hollow at the apex, instead of a prominent longitudinal, central, hollow from mid to apex ( Fig. 2M ).

Figures

FIGURES 2A–M. Holotype (A–H) and allotype (I–M) of Paratrichius tergorufus Ricchiardi, new species. A, habitus, dorsal view; B, habitus, lateral view; C, habitus, ventral view; D, head; E, pygidium; F, parameres, dorsal view; G, spiculum gastrale; H, parameres, lateral view; I, habitus, dorsal view; J, habitus, lateral view; K, habitus, ventral view; L, head; M, pygidium.