Maechidius muticus Arrow, 1941

Telnov, Dmitry, 2020, A revision of the Maechidiini Burmeister, 1855 (Coleoptera: Scarabaeidae: Melolonthinae) from the Indo-Australian transition zone, and the first record of the tribe west of Wallace’s Line, European Journal of Taxonomy 721, pp. 1-210 : 81-83

publication ID	https://doi.org/ 10.5852/ejt.2020.721.1127
publication LSID	lsid:zoobank.org:pub:89E62EF8-2E45-4C59-94B7-6A5603E8939B
DOI	https://doi.org/10.5281/zenodo.4344521
persistent identifier	https://treatment.plazi.org/id/1A3787F6-9D4C-9209-FDC2-FC24C9FD2B3F
treatment provided by	Valdenar
scientific name	Maechidius muticus Arrow, 1941
status

Treatment

Maechidius muticus Arrow, 1941 View in CoL

Figs 63 View Figs 62–65 , 147 View Figs 145–156 , 235 View Figs 226–241 , 326 View Figs 317–332 , 399, 495, 555, 673–675

Type material

Syntypes

INDONESIA • 1 ♂; “ Type [p, label circular, red frame] // SYNTYPE [p, label circular, blue frame] // DUTCH NEW GUINEA : Humboldt Bay Dist. Bewani Mts. 400 metres. vii.1937. [p] // W. Stüber. B.M.1938-177. [p] // Maechidius muticus , type Arrow [h]”; BMNH • 2 ♂♂; “ SYNTYPE [p, label circular, blue frame] // DUTCH NEW GUINEA : Humboldt Bay Dist. Bewani Mts. 400 metres. vii.1937. [p] // W.Stüber. B.M.1938-177. [p]”; BMNH • 1 ♂; “ SYNTYPE [p, label circular, blue frame] // ♂ [p] // W.Stüber. B.M.1938-177. [p] // DUTCH NEW GUINEA : Humboldt Bay Dist. Bewani Mts. 400 metres. vii.1937. [p]”; BMNH .

Remarks

There are several male syntypes from the same locality available for this species. A lectotype is therefore not designated since there is no risk of confusion.

Description

With general features of M. interruptocarinulatus Heller, 1914 . Male labroclypeus ( Fig. 147 View Figs 145–156 ) sinuous and shallowly emarginate anteriorly, its anterolateral margins sinuous in both dorsal and lateral views. Anterolateral angles almost right-angled, slightly protruding. Punctures of frons circular to hexagonal, moderately deep and dense. Intervening spaces glossy, generally smaller than punctures. Setae inconspicuous, scale-like, appressed; each seta rises from anterior margin of corresponding puncture, surpassing or not length of corresponding puncture. Male antenna 9-segmented, club 3-lamellate. Pronotum transverse, glossy dorsally and laterally. Anterior margin broadly sinuous with protruding anterolateral angles (stronger) and mesal portion (slightly), basal margin broadly rounded with posterolateral angles somewhat protruding posteriad. Lateral margin of pronotum nearly straight, slightly constricted anteriorly and prebasally, crenulate all along ( Fig. 235 View Figs 226–241 ). Lateral margin of pronotum nearly straight in lateral view. An appressed short seta present between every two crenulae. Lateral and basal margins, antero- and posterolateral angles partly covered with dense microscopical velvety pubescence. Hypomeron emarginate and long setose on anterior margin which is flange-like protruding. Antennal pocket deep. Punctures of pronotal disc generally larger and stronger oblong than those on head, inner margin with thin membrane covered with dense microscopical velvety pubescence. Intervening spaces glossy, in part wrinkled. Setae scale-like, appressed to suberect, generally not surpassing length of corresponding puncture. Longer scale-like clavate suberect setae on posterolateral angles. Scutellar shield narrowly rounded apically. Elytron glossy, with five vague glabrous, variously broadly interrupted longitudinal carinae, including sutural one. Punctures of elytral disc ovoid, generally smaller than on forebody, deep ( Fig. 326 View Figs 317–332 ). Each puncture partly or completely encircled with dense microscopical velvety pubescence. Intervening spaces glossy, glabrous, generally smaller than punctures. Setae inconspicuous, generally not surpassing length of corresponding punctures, becoming somewhat longer and less appressed along tracks of longitudinal carinae. Each elytron with a long lateral subhumeral seta on lateral margin. Male pygidium flattened dorsally ( Fig. 495 View Figs487–503 ). Punctures of pygidium ovoid, dense and very deep, setae suberect, not or hardly surpassing length of corresponding punctures. Male protibia somewhat arched and crenulate on external margin, with single obtuse distal tooth (Fig. 399). Male tarsal claws with pulvilli. Spiculum gastrale as in Fig. 555 View Figs 545–569 . Aedeagus as in Figs 673–675 View Figs 667–681 .