Heteroborips indicus, 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

Heteroborips indicus sp. nov. Fig. 63C, D, J

Type material.

Holotype, female, India: [West] Bengal, Darjeeling, Debrepani, 6000 ft, 20.xi.1929, J.C.M. Gardner, ex Michelia excelsa (NMNH). Paratypes, female, as holotype (NMNH, 5).

Diagnosis.

2.2-2.4 mm long (mean = 2.3 mm; n = 4); 2.75-3.0 × as long as wide. This species is distinguished by the distinctive elytral mycangium which appears as a distinctly impressed area immediately adjacent to the scutellum on each elytron; and declivity broadly sloping, occupying 1/2 of elytra.

Similar species.

Heteroborips fastigatus , H. seriatus , Tricosa cattienensis , T. indochinensis .

Description

(female). 2.2-2.4 mm long (mean = 2.3 mm; n = 4); 2.75-3.0 × as long as wide. Body, antennae and legs uniformly light brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons flattened to upper level of eyes; surface shiny, punctate, setose; punctures dense, becoming shallower and sparser on reticulate upper part of frons. Eyes feebly emarginate just above antennal insertion, upper part smaller than lower part. Submentum flat, flush with genae, triangular. Antennal scape regularly thick, as long as club. Pedicel as wide as scape, as long as funicle. Funicle 4-segmented, segment 1 shorter than pedicel. Club longer than broad, obliquely truncate, type 2; segment 1 corneous, transverse on anterior face, occupying basal 2/5, nearly covering posterior face; segment 2 narrow, corneous; segment 1 present on posterior face. Pronotum: 1.0 × as long as wide. In dorsal view conical, type 0, sides convex, conical anteriorly; anterior margin without serrations. In lateral view tall, type 2, summit pronounced, just behind middle. Anterior slope with densely spaced small asperities, becoming lower and more strongly transverse towards summit. Disc alutaceous, subshiny, with sparse coarse punctures bearing short, recumbent setae, some longer hair-like setae at margins. Lateral margins obliquely costate. Base transverse, posterior angles broadly rounded. Elytra: 1.88 × as long as wide, 1.88 × as long as pronotum. Scutellum moderately sized, linguiform, slightly raised above elytra, flat, shiny. Elytral mycangium comprised of two oblong pit mycangia immediately adjacent to scutellum, one on each elytron. Elytral base transverse, edge oblique, humeral angles rounded, parallel-sided in basal 3/4, then acuminate to apex. Disc ascending apically, shiny, striae not impressed, with moderately sized deep punctures separated by 2-4 diameters of a puncture, punctures setose, setae semi-erect, slightly longer than puncture diameter; interstriae flat, impunctate, glabrous. Declivity occupying 1/2 of elytral length, shiny, gradually rounded; strial punctures larger than on disc, striae weakly impressed, punctures setose, setae semi-erect, as long as interstriae 1 width; interstriae laterally broadened from declivital summit to apical 1/3 then narrowed to apex, basal 1/2 of interstriae 1-3 uniseriate punctate, punctures subequal to those of striae, apical 1/2 impunctate, punctures replaced by 4-7 granules, granules widely spaced, interstriae 4-8 impunctate and unarmed, setose, as described for striae. Posterolateral margin rounded. Legs: procoxae contiguous. Protibiae distinctly triangular, posterior face smooth; apical 1/3 of outer margin with four or five large socketed denticles, their length longer than basal width. Meso- and metatibiae flattened; outer margin evenly rounded with eight or nine and seven or eight large socketed denticles, respectively.

Etymology.

L. indicus = of India. An adjective.

Distribution.

India (West Bengal).

Host plants.

This species has only been reported from Michelia ( Magnoliaceae ).

Remarks.

The entire type series is card mounted and ventral characters could not be examined.

Figures

Figure 63. Dorsal, lateral and declivital view of Heteroborips fastigatus holotype, 3.4 - 3.5 mm (A, B, I), H. indicus holotype, 2.2 - 2.4 mm (C, D, J), H. seriatus, 2.5 - 2.9 mm (E, F, K), and H. tristis, 3.9 - 4.0 mm (G, H, L).