A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China Author Smith, Sarah M. Department of Entomology, Michigan State University, 288 Farm Lane, East Lansing, Michigan 48824, USA https://orcid.org/0000-0002-5173-3736 camptocerus@gmail.com Author Beaver, Roger A. 161 / 2 Mu 5, Soi Wat Pranon, T. Donkaew, A. Maerim, Chiangmai 50180, Thailand Author Cognato, Anthony I. Department of Entomology, Michigan State University, 288 Farm Lane, East Lansing, Michigan 48824, USA text ZooKeys 2020 983 1 442 http://dx.doi.org/10.3897/zookeys.983.52630 journal article http://dx.doi.org/10.3897/zookeys.983.52630 1313-2970-983-1 7DED4CE2934C4539945F758930C927F9 C890C7FD4B2D57A8B1A062305ED42D53 Ambrosiophilus caliginestris sp. nov. Fig. 13C, D, J Type material. Holotype , female, Vietnam: Cao Bang, 22°36.454'N , 105°52.083'E , 1661 m, 15.iv.2014, VN35, Cognato, Smith, Pham, ex phloem (MSUC). Diagnosis. 2.9-3.1 mm long (mean = 3.0 mm; n = 2); 2.42-2.58 x as long as wide. This species is distinguished by all declivital interstriae granulate along the entire length; pronotum from lateral view tall (type 2); declivital striae 1 weakly impressed; declivital interstriae moderately and uniformly granulate, granules spaced by a distance of four diameters of a granule; interstrial setae long, hair-like; and moderate size. Similar species. Ambrosiophilus atratus , A. satoi , A. sulcatus . Description (female). 2.9 mm long (n = 1); 2.42 x as long as wide. Body ferruginous. 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 shagreened, punctate; 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 narrow, triangular, slightly impressed. Antennal scape regularly thick, longer than club. Pedicel as wide as scape, much shorter than funicle. Funicle 4-segmented, segment 1 shorter than pedicel. Club approximately circular and flat, type 3; segment 1 corneous, transverse on anterior face, occupying approximately basal 1/2; segment 2 narrow, corneous; segments 1 and 2 present on posterior face. Pronotum : 0.9 x as long as wide. In dorsal view basic and parallel-sided, type 2, sides parallel in basal 1/2, rounded anteriorly; anterior margin without serrations. In lateral view tall, type 2, disc flat, summit pronounced. Anterior slope with densely spaced small asperities, becoming lower and more strongly transverse towards summit. Disc shagreened with sparse, fine punctures bearing long, fine, erect hair-like setae, some longer hair-like setae at margins. Lateral margins obliquely costate. Base transverse, posterior angles broadly rounded. Elytra : 1.54 x as long as wide, 1.6 x 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 shiny, striae not impressed, punctures moderately coarse, shallow, separated by less than one diameter 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, shiny; strial punctures larger than on disc, striae 1 weakly impressed; interstriae moderately and uniformly granulate, granules spaced by a distance of four diameters of a granule, each granule with a moderately long, erect hair-like seta. Posterolateral margin carinate, granulate to interstriae 7. Legs : procoxae contiguous; prosternal coxal piece tall, pointed. Protibiae slender, obliquely triangular, broadest at apical 1/3; posterior face smooth; apical 1/2 of outer margin with eight large socketed denticles, their length longer than basal width. Meso- and metatibiae flattened; outer margins evenly rounded with eight large socketed denticles. Etymology. L. caligo = fog; - estris = belonging to. In reference to the climate of the type localities. An adjective. Distribution. Vietnam. Host plants. Unknown.