Premnobius brownei Atkinson & Flechtmann, 2023

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 : 74-76

Premnobius brownei Atkinson & Flechtmann , new species

Fig. 3 A–D urn:lsid:zoobank.org:act:5C796C45-7F67-4165-83BD-7EFAE7572484

Diagnosis: Among the American species P. brownei is unique in that the large process on the declivital crest is elongate and digitate, rather than quadrate..

Female. Total length: 1.13 mm, maximum width: 0.35, length of elytra: 0.65 mm, total length / width: 3.23, elytra length / width: 1.86, pronotal length / width: 1.37 (n=1). Color dark reddish brown, darker on posterior half and declivity.

Frons smooth, shining, surface shallowly punctured, punctures separated by 3 their diameters, a weak longitudinal carina evident from above the upper level of the eyes to the epistoma. First segment of the anterior face of the antennal club corneous, strongly procurved, extending to middle of club; remainder of anterior face pubescent with two procurved sutures visible. Corneous first segment of club displaced distally on posterior face, extending above middle; distal pubescent area with two sutures visible distally and laterally.

Pronotum bluntly rounded anteriorly, with ten slightly raised, uniform asperities along margin. Summit anterior to middle, asperities slightly wider than thick, decreasing in size posteriorly. Disc smooth, shining with sparse, short setae, separated by greater than their length.

Elytral disc shining, smooth. Striae not impressed on elytral disc, punctures uniseriate with short, recumbent setae. Interstriae 3 as wide as striae, with slightly confused, erect setae, similar in size to those on pronotal disc, shorter than width of interstriae. Declivity gradual, concave, occupying 35% of elytral length in lateral view. Posterolateral margin raised from apex, nearly to base, widest in middle, narrowed behind. Interstria 1 above base with a row of small uniseriate denticles; most other interstriae with some granules near base of declivity. Interstria 2 with small acute denticles at base of declivity. A larger, digitate tubercle is located on the elevated margin about 1/3 of the distance to the apex. The largest digitate projection on the lateral margin is near the apex and twice as long as the middle projection. Confused strial punctures and setae are visible on the declivital face.

Male. Unknown.

Type Material. Holotype, female, Brazil: Bahia: Vitória da Conquista , UESB campus, 1452′48″ S, 4047′37″ W, 891 m, 7–VI–2019, ethanol-baited, L.C. Oliveira, disturbed seasonal montane forest fragment ( MEFEIS).

Distribution. Known only from the type locality in eastern Brazil ( Fig. 12D ).

Etymology. This species is named in honor of F.G. Browne for his work on the Premnobiina.

Figures

FIGURE 3. Premnobius brownei Atkinson & Flechtmann, female holotype. A. dorsal habitus; B. lateral habitus; C. frons and antenna; D. declivity. All 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.