Trigonops inusitata Zimmerman. 1942, new species
Creators: name: Zimmerman, Elwood C.
Publisher: name: Zenodo
Year: 1942
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Curculionidae
Trigonops
Trigonops inusitata

description: 2. Trigonops inusitata, new species (pl. 1, <i>F).</i> Derm very dark brown to black; rostrum with brown scales, often with a greenish or bronzy cast at base, those on apical declivitous part usually mostly greenish; head with brown scales with bronze and green scales intermixed; pronotum with pale, almost white scales, with fawn-colored and darker brown scales interspersed, lateral scaling palest, most scales with a bronzy cast; elytra predominantly with dark brown bronzy scaling, usually with a conspicuous, almost white, broadly V-shaped fascia across middle, but this fascia subject to great variation, often absent or indistinct; legs with paler scaling beyond middle of club of femora than proximally, tibiae with similarly colored, rather dark brown bronzy scales as on bases of femora; scaling below similar to that on sides of elytra. <i>Head</i> with round, rather deep punctures on front, punctures usually not separated by more than their diameters, and variable, usually somewhat obscured by the scaling, each puncture bearing a white, recurved seta which does not reach much beyond the margin of its puncture, scales close, not imbricated; eyes evenly convex, not strongly protuberant and only slightly interrupting longitudinal lateral outline of head, about as long as narrowest interocular breadth. <i>Rostrum</i> with basal part between transrostral carina and basal suture almost straight or slightly convex longitudinally, slightly shorter than distance between eyes, with a variable median carina that is usually distinct only near the transrostral carina; declivitous apical part rather shiny, with small obscure punctures, scales becoming smaller and sparser distally; apex, sides, and venter of rostrum, including sides of mandibles, bristling with long erect setae. <i>Anten.nae</i> with scape slightly longer 1than funicle excluding club, densely squamose and with numerous, rather long, white, recumbent or subrecumbent setae, apex only slightly enlarged; funicle with short and long setae and without scales, length of segments as follows: (1, 1.8) (2, 1.8) (3, 1.3) (4, 1.2) (5, 1.1) (6, 1.1) (7, 1.0); club about as long as segments 3 plus 4, its first segment bearing the ratio of 10: 6 to its second, first segment as long as funicular segment 7. <i>Prothorax</i> slightly broader than long (4.5: 4.0), broadest at middle, subequally narrowed from middle to base and middle to apex, disk but slightly convex or somewhat depressed; punctures coarse and deep, somewhat irregular and variable, often making dorsum somewhat irregular, some tending to be longitudinally confluent, interstices variable in breadth, some only as broad as a scale and narrower than punctures, others as broad as punctures, others broader; each puncture bearing a recurved, transversely directed seta about as long as its puncture; puncturation less coarse and deep on pleurae. <i>Elytra</i> from about two thirds to about three fourths as broad as long, broadest in females, broadest at the posterolateral corners of the extensions of humeral angulations; base truncate or slightly concave, almost straightly and angulately expanded on sides to about basal fifth to form conspicuous pseudo-humeri, thence rather broadly rounded to distal third, thence sharply narrowed to apex, or more or less regularly narrowed from just behind basal angulation; disk usually conspicuously irregular, with variform undulations and low, rounded, feeble protuberances of derm, intervals 5 to <i>7</i> usually prominently and irregularly elevated distally; intervals each with a row of decumbent white setae, first intervals usually with a small common fascicle on a line between and slightly before apices of fourth intervals; striae distinct throughout; scales usually free and narrowly separated, appressed, reticulate and iridescent. <i>Legs</i> with femora about as narrow as tibiae at base and about one tenth longer, hind pair reaching to apex of fourth ventrite in female, to middle of fifth in male, strongly clavate, middle of bulbous part about seven tenths length of femora from base and there about three times as broad as base, densely squamose and with scattered inclined white setae; tibiae, excepting a slight distal expansion, subparallel-sided, slightly sinuous, densely squamose and with setae more erect than on femora. <i>Sternum</i> with scaling almost entirely concealing derm above coxae, somewhat sparser between coxae; punctures moderately dense, not very coarse, shortest distance between mid and hind coxae about as long as breadth of a mesocoxa. <i>Venter</i> with first two ventrites tumid in female, broadly impressed down middle in male; punctures shallow, each giving rise to a rather long, suberect seta; scaling dense but not entirely concealing derm; ventrite 5 about twice as long as 3 plus 4, rather coarsely asperate, closely set with fine setae. Length, 5-8 mm.; breadth, 3-4 mm. Holotype male, Barrigada, on <i>Morinda</i>, July 22, 1936, Swezey; allotype female, Ritidian Point, May 22, Bryan; and following paratypes: 20 speci­,mens taken by miscellaneous sweeping, Machanao, June 2, Swezey; two speciTODO mens collected from <i>Piper guahamense,</i> and one each from <i>Calophyllum, Pipturus, Ochrosia,</i> and <i>Macaranga,</i> June 4, Swezey; one, June 5, Usinger; four, June 6, Swezey; two, June 30, Swezey; Upi Trail, one taken by Usinger and two by Bryan, May 5, six, by miscellaneous sweeping, Swezey; one taken from ferns by Swezey; one taken from <i>Premna</i> by Swezey, Sept. 1; one, Orote Peninsula, May 9, Bryan; five, Ritidian Point, April 15, Bryan and four, April 16, four, April 22, five, June 2, Usinger; Barrigada, one from miscellaneous sweeping, June 12, Swezey; one from <i>Hibiscus tiliaceus,</i> one from <i>lntsia bijuga,</i> and three from <i>Marinda,</i> July 22, Swezey; Mt. Alifan, one, May 20, Bryan; Dededo, one, May 11, Swezey; Magua, one taken from <i>Codiaeum,</i> March 31, Bryan; five, without specific locality, July 1923, Hornbostel; three, D. T. Fullaway, labeled only " Island Guam." In the National Museum collection are the following paratypes: 18 specimens bearing labels " Guam 134, R. G. Oakley, ix-15-37, on <i>Piper guahamense</i>, 37-26120" and one labeled " Island Guam " taken by Fullaway. This variable species is one of the most easily recognized of Guam members of the genus because of its coarsely sculptured pronotum and uneven elytra. It is allied to <i>T. vulgaris</i> and <i>T. convexus,</i> but it is quite distinct from either of those species.
description: Published as part of <i>Zimmerman, Elwood C., 1942, Curculionidae of Guam, pp. 73-146 in Insects of Guam I, Honolulu, Hawaii :Bernice P. Bishop Museum</i> on pages 83-84, DOI: 10.5281/zenodo.5159964