Euwallacea neptis, Smith & Beaver & Cognato, 2020

Smith, Sarah M., Beaver, Roger A. & Cognato, Anthony I., 2020, A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China, ZooKeys 983, pp. 1-442 : 1

Euwallacea neptis sp. nov. Fig. 57A, B, I

Type material.

Holotype, female, India: Darjeeling, Rangirum, 6000 ft, J.C.M. Gardner, 5.ix.1929, ex misc. timber (NMNH).

Diagnosis.

4.2 mm long (n = 1); 2.8 × as long as wide. This species is distinguished by the pronotum basic (type 2) when viewed dorsally, anterior margin appearing rounded; and elytral bases rounded, never granulate; declivity gradual, declivital face flat, opalescent; declivital striae impressed, strial punctures large; posterolateral declivital margin elevated, acutely carinate, giving the apical 1/3 of declivity a transversely impressed appearance; and large size.

Similar species.

Euwallacea fornicatus species complex ( E. fornicatior , E. fornicatus , E. kuroshio , E. perbrevis ), E. andamanensis , E. geminus , E. malloti , E. semirudis , E. testudinatus , E. velatus .

Description

(female). 4.2 mm long (n = 1); 2.8 × as long as wide. Body dark red-brown. Legs and antennae light brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes; surface strongly shiny, sparsely, finely punctate, setose; punctures bearing a long, erect hair-like seta. Eyes deeply emarginate just above antennal insertion, upper part smaller than lower part. Submentum narrow, triangular, slightly impressed. Antennal scape long and slender, longer than club. Pedicel as wide as scape, shorter than funicle. Funicle 4-segmented, segment 1 longer than pedicel. Club longer than wide, flat, type 3; segment 1 corneous, transverse on anterior face, occupying approximately basal 1/4; segment 2 narrow, corneous; segments 1-3 present on posterior face. Pronotum: 0.92 × as long as wide. In dorsal view basic and parallel-sided, sides parallel in basal 1/2, rounded anteriorly; anterior margin without serrations. In lateral view tall, type 2, disc flat, summit at basal 2/5. Anterior slope with densely spaced, broad asperities, becoming lower and more strongly transverse towards summit. Disc strongly shiny with sparse, minute punctures, some longer hair-like setae at margins. Lateral margins obliquely costate. Base transverse, posterior angles acutely rounded, almost quadrate. Elytra: 1.7 × as long as wide, 1.83 × as long as pronotum. Scutellum moderately sized, linguiform, flush with elytra, flat, shiny. Elytral base transverse, edge oblique and unarmed by granules, humeral angles rounded, parallel-sided in basal 3/4, then broadly rounded to apex. Disc convex, shiny, striae not impressed, with large, shallow punctures separated by less than one diameter of a puncture, glabrous; interstriae flat, very sparsely finely punctate, punctures 1/3 size of strial punctures, each with a long, erect seta. Declivity occupying approximately 2/5 of elytra, gradual, face flat, opalescent, apical 1/3 appearing transversely impressed; striae impressed, strial punctures much larger and deeper than those of disc; interstriae 2-4 with three widely spaced tubercles on basal 1/2, apical 1/2 unarmed. Posterolateral margin elevated, acutely carinate and granulate to interstriae 7. Legs: procoxae contiguous; prosternal coxal piece tall, pointed. Protibiae broad, semi-circular, with rounded outer margin; posterior face smooth; apical 1/3 of outer margin with eight small, widely spaced socketed denticles, their length shorter longer than basal width. Meso- and metatibiae flattened; outer margin evenly rounded with 12 small socketed denticles.

Etymology.

L. neptis = granddaughter. In reference to its similarity to several Euwallacea species. Noun in apposition.

Distribution.

India (West Bengal).

Host plants.

Unknown.

Figures

Figure 57. Dorsal, lateral and declivital view of Euwallacea neptis holotype, 4.2 mm (A, B, I), E. perbrevis, 2.3 - 2.5 mm (C, D, J), E. piceus, 2.2 - 2.6 mm (E, F, K), and E. semiermis lectotype, 2.5 - 2.75 mm (G, H, L).