Premnobius assiduus (Schedl)

Atkinson, Thomas H., Flechtmann, Carlos A. H. & Petrov, Alexander V., 2023, Synopsis of the Neotropical Premnobiina (Coleoptera: Curculonidae: Scolytinae Ipini) with descriptions of new species, new synonymy and keys to species, Zootaxa 5249 (1), pp. 69-91 : 74

Premnobius assiduus (Schedl)

Fig. 4 G–H

Xyleborus assiduus Schedl, 1961: 228 .

Coptoborus assiduus (Schedl) : Wood & Bright 1992: 662.

Gnathotrupes assiduus (Schedl) : Wood 2007: 671.

Premnobius assiduus (Schedl) : Atkinson et al. 2018: 2 .

Similar species. This species most closely resembles P. perezdelacrucei in that both are very elongate with particularly long pronota.

Diagnosis. Length 1.80–2.25 mm, 3.6–4.4 × as long as wide ( Atkinson et al. 2018: 2). Frons with small, sparse punctures, vestiture more abundant laterally and on epistoma. Pronotum elongate, almost 2 × as long as wide; summit well before middle, anterior slope steep, disc about 75% of pronotal length, shining, punctures fine, vestiture sparse. Strial punctures on elytral disc not impressed, interstriae about 2 × as wide as striae. Interstrial setae fine, uniseriate, length slightly longer than interstrial width, becoming longer towards declivity. Declivity occupying 33% length of elytra, shallowly concave, with an elevated crest from interstria 4 to apex, transition gradual anteriorly. Armature consisting of digitate projection on crest at interstria 4, its length 3 × its width at base; a larger quadrate, blunt projection, laterally compressed, slightly displaced mesad from crest on lower fourth; small, irregular granules also present. Punctures confused on declivital face, deeper than those on disc, some short, slender setae, these shorter than those near declivital crest.

Distribution. Northern South America and Amazon Basin ( Fig. 12D ).

New Records. Brazil: Amazonas, Manaus, Universidade Federal do Amazonas, Campus Senador Arthur Virgilio Filho , 35.57′ S, 5957.674′W, 24-VI-2021, ethanol-baited FIT, E.A.C. Corrêa, dense ombrophilus forest ( MEFEIS, 1) ; Venezuela, Mérida, 20 km SW El Vigía , 50 m, 10-XII-1989, tree seedling, collection 180, S.L. Wood ( USNM, 1, in unidentified material in Wood collection) .

Figures

FIGURE 4. Dorsal and posterolateral views of declivities of Neotropical species of Premnobius, part 1. A,B. P. neoadjunctus (Schedl); C,D. P. perezdelacrucei Petrov & Atkinson; E,F. P. flechtmanni (Wood); G,H. P. assiduus (Schedl). Photographs by T.H. Atkinson.

FIGURE 12. Known localities for Neotropical species of Premnobiina. A. Premnobius cavipennis; B. Premnobius ambitiosus; C. Premnobius perezdelacrucei; D. Premnobius species.; E,F. Premnophilus species. Species are grouped only to avoid overlap of collection localities on maps. No ecological or systematic relationships are implied.