Malcho chilensis ( Cerda, 1968 ) Mondaca & Beéche, 2022

Mondaca, José & Beéche, Marcos, 2022, A new genus for Stromatium chilensis Cerda, 1968 (Coleoptera: Cerambycidae: Cerambycinae: Hesperophanini) from Chile, Insecta Mundi 2022 (930), pp. 1-7 : 3-6

Malcho chilensis ( Cerda, 1968) , new combination

( Fig. 1–9 )

Stromatium chilensis Cerda 1968: 105 ; Peña 1974: 264 (type); Monné 1993: 7 (cat.); Monné and Giesbert 1994: 46 (checklist); Martins and Galileo 1999: 71; Monné 2005: 276 (cat.); Galileo et al. 2008: 15; Monné 2021: 432 (cat.); Jin et al. 2019: 142.

Diagnosis. Body testaceous or castaneus, sparsely setose. Pronotum testaceous or reddish brown, dorsally and laterally densely punctate and protuberant. Elytral surface nearly glabrous and densely punctate, with a few fine setae scattered on posterior half ( Fig. 2–4, 7–9 ).

Type material. Male holotype at FMNH from Chile: a) “ Linares / Cord. Parral / Fundo Malcho / 15.II.958 / M. Rivera Cordillera de Parral, 700– 900 m. alt.” ; b) “FMHN, 1986 / L. E. Pena Coll / Acc. # 17-422” ; c) “Gnaphalodes / chilensis Cerda / M. CERDA -DTE 1965”; d) “ Stromatium / chilensis / nov. sp. / Cerda det. HOLOTYPUS ”; e) “HOLOTIPO”; f) “Qr code / FMNHINS / 3982410 / FIELD MUSEUM / pinned”; g) “PHOTOGRAPHED / S. Ware 2020 / EMu catalog” ; h) “ Malcho / chilensis ( Cerda, 1968) / Det. J. Mondaca & M. Beéche 2022 ”. Male paratype at FMHN from: a) “ Fdo. MALCHO / Cord. Parral / Febr-1958 / Leg; M. Rivera ” ; b) “PARATIPO”; c) “FMNH, 1986 / L. E. Pena Coll. / Acc. # 17-422” ; d) “ Stromatium / chilensis / Cerda / M. CERDA-DTE 1968”; e) “PHOTOGRAPHED / S. Ware 2020 / EMu catalog” ; f) “Qr code / FMNHINS / 3982411 / FIELD MUSEUM / pinned”; g) “ Malcho / chilensis ( Cerda, 1968) / Det. J. Mondaca & M. Beéche 2022 ”.

Other material studied. 21 specimens (18 males, 3 females) from CHILE: Región del Maule: Vilches Alto, XI-1991, col. R. Pérez de Arce (1 female, MNNC). Región de Ñuble : Las Trancas, 12-I-1986, leg. M. Beéche (1 male, MBCC) ; Los Lleuques , 26-I-2017 (2 males, JMEC, 1 male, MBCC), 13-I-2012 (1 female, MBCC), 6-I-2013 (1 male, MBCC), 16-I-2014 (1 male, MBCC), 13-I-2015 (2 males, MBCC), 6-I-2016 (3 males, MBCC), 8-I- 2016 (1 male, MBCC), 18-I-2017 (1 male, MBCC), 27-I-2017 (1 male, MBCC), 28-I-2017 (1 female, MBCC) ,

17-I-2018 (1 male, MBCC), 21-I-2018 (1 male, MBCC), 15-I-2020 (1 male, MBCC), leg. M. Beéche . Región de La Araucanía: Malleco, P.N. Nahuelbuta, Piedra del Águila, 5-XI-2002, col. A. Marín y E. Benavides (1 male, JMEC). Distribution and habitat. Maule (Talca and Linares provinces), Ñuble (Diguillín province) and La Araucanía (Malleco province) regions ( Fig. 10 ). Based on these records, Malcho chilensis is restricted to central-southern Chile, area of Nothofagus forests ( Fig. 11, 12 ), located in the Andes premountain range and in the coastal range. These localities are part of the Subantarctic subregion, Maule province, sensu Morrone (2015).

Natural history. Nothing is known about immature stages, life cycles, and host plants. The adults are nocturnal and emerge in late spring and during summer (November to February). Specimens of both sexes have been collected with light trap at night.

Adult activity period. January (19), February (2) and November (2).

Remarks. The original description of S. chilensis by Cerda (1968) reported that the male holotype measures 16 mm long and 4 mm wide. However, it actually measures 11.8 mm long and 3 mm wide with the elytra slightly open ( Fig. 2 ).

Figures

Figure 1. Right antenna of Malcho chilensis showing the spine on the inner side of antennomeres III–V.

Figures 2–9. Type specimens of Stromatium chilensis Cerda (= Malcho chilensis). 2–4) Holotype male. 2) Dorsal view. 3) Ventral view. 4) Lateral view. 5) Holotype label. 6) Paratype label. 7–9) Paratype male. 7) Dorsal view. 8) Ventral view. 9) Lateral view. Scale bars: 5 mm.

Figure 10. Distribution of Malcho chilensis (Cerda) in central-southern Chile.

Figures 11–12. Habitat of Malcho chilensis in central-southern Chile. 11) Nothofagus forest in Altos de Vilches, Maule Region. 12) Nothofagus forest in Los Lleuques, Ñuble Region.