Ambrosiophilus 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

Ambrosiophilus indicus sp. nov. Fig. 14A, B, I

Type material.

Holotype, female, India: Bengal [West Bengal], Kalimpong, Samsingh, 25.x.1933, N.C. Chatterjee, ex "kanda lahara" (NMNH). Paratypes, female, as holotype (NMNH, 2). All specimens are individually point mounted to a single pin. The top specimen is the holotype and the bottom two are paratypes.

Diagnosis.

2.4 mm long (mean = 2.4 mm; n = 3); 2.67 × as long as wide. This species is distinguished by declivital interstriae 1 unarmed, interstriae 2 armed by one tubercle at declivital summit, remainder of interstriae 2 unarmed, interstriae 3 with three minute tubercles equally spaced from base to apex; declivity weakly bisulcate from sutural margin to striae 2, interstriae 3 feebly convex; pronotal surface shagreened, discal punctures minute, very fine, widely spaced by four diameters of a puncture; declivital surface shagreened; and small size.

Similar species.

Ambrosiophilus consimilis , A. cristatulus , A. subnepotulus .

Description

(female). 2.4 mm long (mean = 2.4 mm; n = 3); 2.67 × as long as wide. Body ferruginous, antennae and legs light brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes; surface subshiny, punctate; punctures moderately dense, becoming shallower and sparser on reticulate upper part. Eyes shallowly emarginate just above antennal insertion, upper part smaller than lower part. Submentum narrow, triangular, slightly impressed. Antennal scape regularly thick, longer than club. Pedicel as wide as scape, as long as funicle. Funicle 4-segmented, segment 1 shorter than pedicel. Club approximately circular and flat, type 4; segment 1 transverse on anterior face, occupying approximately basal 1/6; segment 2 narrow, larger than segment 1, corneous; segments 1-3 present on posterior face. Pronotum: 1.1 × as long as wide. In dorsal view basic, type 2, sides parallel in basal 1/2, rounded anteriorly; anterior margin without serrations. In lateral view basic, type 0, disc flat, summit pronounced. Anterior slope with closely spaced, coarse asperities, becoming lower and more strongly transverse towards summit. Disc shagreened with sparse, small, fine punctures bearing short, fine, erect hair-like setae, some longer hair-like setae at margins. Lateral margins obliquely costate. Base transverse, posterior angles broadly rounded. Elytra: 1.3 × as long as wide, 1.58 × as long as pronotum. Scutellum moderately sized, linguiform, flush with elytra, flat, shiny. Elytral base transverse, edge oblique, humeral angles rounded, parallel-sided in basal 3/4, then broadly rounded to apex. Disc subshiny, striae not impressed, with moderately coarse, shallow punctures separated by 1-2 diameters of a puncture, glabrous; interstriae flat, finely punctate, punctures more widely separated than those of striae, with long, fine, erect hair-like setae. Declivity steep, strongly convex, shagreened; strial punctures larger than on disc, weakly bisulcate from sutural margin to striae 2; interstriae 1 unarmed, interstriae 2 armed by one tubercle at declivital summit, remainder of interstriae 2 unarmed, interstriae 3 with three minute equally spaced tubercles from base to apex; interstriae 3 feebly convex. Posterolateral margin carinate to interstriae 7. Legs: procoxae contiguous. Protibiae obliquely triangular, broadest at apical 1/3; posterior face smooth; outer margin of apical 1/2 with six moderate socketed denticles, approximately as long as basal width. Meso- and metatibiae flattened; outer margins evenly rounded with seven large socketed denticles.

Etymology.

L. indicus = of India. An adjective.

Distribution.

India (West Bengal).

Host plants.

Unknown.

Figures

Figure 14. Dorsal, lateral and declivital view of Ambrosiophilus indicus holotype, 2.4 mm (A, B, I), A. lannaensis holotype holotype, 1.95 - 2.05 mm (C, D, J), A. latisulcatus, 3.9 - 4.2 mm (E, F, K), and A. osumiensis, 2.3 - 3.2 mm (G, H, L).