Allocrus, Santos-Silva & Monné, 2023

Santos-Silva, Antonio & Monné, Miguel A., 2023, Description of three new species and one new genus in American Acanthocinini (Coleoptera, Cerambycidae), Zootaxa 5263 (2), pp. 273-284 : 279-281

Allocrus gen. nov.

( Figs 12–20 )

Type species: Pseudolepturges caesius Monné & Monné, 2007 , here designated.

Etymology. Prefix “allo-,” from Greek “ἄλλος,” meaning “different” or “other”, and “crus”, Latin (meaning leg); allusive to the shape of the meso- and metatibiae. Neuter gender.

Description. Small-sized; body moderately convex and slender ( Figs 12, 14 ). Head elongated behind eyes ( Fig. 16 ), not retractile ( Fig. 14 ). Frons ( Fig. 15 ) transverse. Upper eye lobes narrow; distance between them about four times width of one upper lobe ( Fig. 16 ). Lower eye lobes ( Fig. 15 ) distinctly longer than gena. Antennae ( Fig. 12 ) 11-segmented, distinctly longer than body in both sexes; scape subcylindrical, not reaching posterior margin of prothorax, without apical cicatrix; antennomeres III–XI cylindrical. Prothorax ( Fig. 16 ) about as long as wide; anterior constriction narrow, well marked; sides rounded close to anterior constriction, subparallel sided toward lateral tubercles, distinctly narrowed between lateral tubercles and posterolateral angles; lateral tubercles ( Fig. 16 ) almost located on posterior quarter, moderately small, with acute apex directed backward. Pronotum ( Fig. 16 ) not tuberculate, slightly convex, in lateral view inclined toward posterior margin from anterior third; sides of posterior third depressed; abundantly, coarsely punctate, punctures forming an arched row posteriorly, not following toward sides of prothorax. Prosternal process ( Fig. 13 ) distinctly narrow centrally. Mesoventral process ( Fig. 13 ) slightly narrowed centrally; apex emarginate; narrowest area about nine times narrower than mesocoxa. Elytra without erect setae; humeri not projected, rounded; sides slightly divergent on anterior third, slightly rounded from this point to apex; apex transversely concave; outer angle triangularly projected and sutural angle somewhat rounded projected; without centrobasal crest, distinct humeral carina and dorsal carinae; somewhat coarsely and abundantly punctate, punctures sparser form middle. Profemora fusiform; meso- and metafemora pedunculate-clavate; metafemoral club not remarkably swollen; apex of metafemora not reaching elytral apex. Apical region of meso- and metatibiae ( Figs 17–20 ) concave dorsally, more distinctly in lateral view; with dense fringe of long, erect, thick setae dorsally. Protarsomeres II–III distinctly widened ( Fig. 12 ); metatarsomere I ( Fig. 14 ) slightly longer than II–III together. Ventrite 5 ( Fig. 13 ) in female V-shaped emarginate apically; ventrite 5 in male truncate (Monné & Monné 2007).

Included species. Allocrus caesium (Monné & Monné, 2007) .

Material examined. BRAZIL, Pará: Jacundá, Rio Tocantins, 1 female, 14. V .1984, W. Overal leg. ( MZSP 52547 ) .

Remarks. Allocrus gen. nov. differs from Pseudolepturges Gilmour, 1957 as follows (considering only P. rufulus (Bates, 1885) , the type species): Lower eye lobes distinctly longer than genae ( Fig. 15 ); pronotum ( Fig. 16 ) coarsely and abundantly punctate throughout; punctures on posterior region of the prothorax not following toward sides of the prothorax; apical region of meso- and metatibiae ( Figs 17–20 ) concave dorsally, with dense fringe of long, erect, thick setae dorsally; protarsomeres II–III ( Fig. 12 ) distinctly widened; and metatarsomere I ( Fig. 14 ) slightly longer than II–III together. In Pseudolepturges (see photographs on Bezark 2023 and Nascimento & Perger 2018): lower eye lobes distinctly shorter than genae, pronotum with only a row of coarse punctures posteriorly, following to the sides of the prothorax; meso- and metatibiae not strongly narrowed apically, especially metatibiae, and does not have fringe of long, thick, and light setae dorsally, especially on metatibiae; protarsomeres II–III slightly widened; and metatarsomere I almost twice as long as II–III together.

As the lateral tubercles of the prothorax is located approximately in the middle of the region between the posterolateral angle and the middle of the prothorax, Allocrus gen. nov. can be included in two alternatives of couplets in the key from Monné et al. (2020).

Considering the lateral angles closer to posterolateral angles than to middle of the prothorax, the new genus can be included in the alternative of couplet “51:”

51(49). Mesoventral process very narrow, usually narrower than 1/4 of the width of mesocoxal cavity.................... 51’

- Mesoventral process at least as wide as 1/3 the width of mesocoxal cavity..................................... 52

51’(51). Apical region of the meso- and metatibiae concave dorsally, and with dense fringe of long, thick, and erect setae............................................................................................ Allocrus gen. nov.

- Apical region of meso- and metatibiae with different shape and setae........... Lepturges (Lepturges) Bates, 1863 (part)

Considering the lateral angles closer to middle of the prothorax than to posterolateral angles, the new genus can be included in the alternative of couplet “56:”

56(55). General color orangish................................................ Luteolepturges Monné & Monné, 2012

- General color dark................................................................................ 56’

56’(56). Metatibiae cylindrical throughout, without dense fringe of long and thick setae dorsally... Lophopoenopsis Melzer, 1931

- Apical region of the meso- and metatibiae concave dorsally, and with dense fringe of long, thick, and erect setae............................................................................................ Allocrus gen. nov.

Figures

FIGURES 12–20. Allocrus caesium (Monné & Monné, 2007), comb. nov., female: 12) Dorsal habitus; 13) Ventral habitus; 14) Lateral habitus; 15) Head, frontal view; 16) Pronotum; 17) Mesotibia, oblique view; 18) Mesotibia, lateral view; 19) Metatibia, oblique view; 20) Metatibia, lateral view.