Heterachthes hildebranti Galileo & Santos-Silva, 2016

Heffern, Daniel, Botero, Juan Pablo & Santos-Silva, Antonio, 2020, Synonymies, new records, and new species in Cerambycinae (Coleoptera Cerambycidae), Zootaxa 4747 (1), pp. 177-190 : 185

Heterachthes hildebranti Galileo & Santos-Silva, 2016

( Figs. 23–30 )

Heterachthes hildebranti Galileo & Santos-Silva, 2016: 395 ; Monné, 2019: 531; Bezark, 2019b: 130 (checklist).

Male ( Figs. 23–26 ). The second known male differs from the holotype by the first yellowish macula of the elytra slightly slender and not narrowed from anterior to posterior area, second yellowish macula of the elytra more narrowed toward suture, and not ending near it, prothorax slightly rounded laterally, and pronotum with punctures sparser.As no other reliable differences are found, we think that these differences are only variations in the species.

Female. Description. ( Figs. 27–30 ). Yellowish band on anterior third of elytra subtriangular; circum-scutellar region, basal half of the elytra along suture and sides brown; ventral surface of thorax and legs slightly dark reddish brown. Antennae 1.7 times elytral length, reaching elytral apex at basal third of antennomere X; antennomeres III–V slenderer than in male.Antennal formula (ratio) based on length of antennomere III: scape = 0.57; pedicel = 0.12; IV = 0.56; V = 0.72; VI = 0.76; VII = 0.75; VIII = 0.72; IX = 0.67; X = 0.59; XI = 0.67. Apex of abdominal ventrite V rounded.

Dimensions, male/female. Total length, 17.20/19.30; prothorax: length, 3.25/3.65; anterior width, 2.15/2.50; posterior width, 2.30/2.70; maximum prothoracic width, 2.35/3.05; humeral width, 3.50/4.00; elytral length, 10.65/12.10.

Material examined. MEXICO, Jalisco (New state record): La Yerbabuena (1950 m), 5.VIII.1994, G. Nogueira col. ( MZSP) . Colima: vic. Manzanillo ( El Naranjo TDF), 14.VII.2017, Rifkind & Martinez col. ( LGBC) .

Remarks. According to Martins (1970) (translated): “It will include heterogeneous species that have as common characteristics the absence of carina in the antennae and generally in the tibiae, procoxal cavities closed behind and, almost always, antennomeres III–VI thickened in the antenna of the males.” However, the procoxal cavities are somewhat variable in Compsibidion Thomson, 1864 and Heterachthes Newman, 1840 : often they are slightly opened in species of both genera, and may be slightly variable also in the same species. This makes problematic the inclusion of some species even in the subtribes, because the main feature separating Compsina (Heterachthes) from Neoibidionina (Compsibidion) is the shape of the procoxal cavities: closed in the former, open in the latter. Furthermore, although the basal antennomeres in Heterachthes are often not dorsally carinate, there are species with the carina present (at least slightly marked). In the same way, the shape of the basal antennomeres of the males are very variable in the species currently allocated in these two genera. Accordingly, it is not possible separating Heterachthes from Compsibidion safely.

Figures

FIGURES 23–30. Heterachthes hildebranti. 23–26), Male: 23) Dorsal habitus; 24) Ventral habitus; 25) Lateral habitus; 26) Head, frontal view. 27–30) Female: 27) Dorsal habitus; 28) Ventral habitus; 29) Lateral habitus; 30) Head, frontal view.