Panscopus (Dolichonotus) acutisetus Spanton, 2016

Spanton, Timothy G. & Anderson, Robert S., 2016, A Taxonomic Revision of Weevils of the Genus Panscopus Schönherr (Coleoptera: Curculionidae: Entiminae: Tropiphorini), The Coleopterists Bulletin (mo 15) 70, pp. 1-86 : 26-27

Panscopus (Dolichonotus) acutisetus Spanton , new species

( Figs. 9 , 35 , Map 10 )

depression at base of frons very shallow, frons and rostrum almost continuous in lateral view, rostrum with thin, sharp longitudinal medial carina, lateral carinae indistinct; apical nasal plate not clearly delimited from dorsal surface of rostrum, v-shaped carina indistinct. Antennae: Scape extending beyond posterior margin of eye. Pronotum: Approximately as wide as long, lateral margin roundly convex; median longitudinal sulcus distinct, narrow, extending length of pronotum, surface rugosetuberculate. Elytra: Combined width only slightly more than half of length, alternate intervals elevated, with double or partly triple rows of decumbent, coarse setae; even intervals asetose, serial punctures each covered with a scale approximately 1/2 longer and wider than surrounding scales; integument obscured by dense vestiture of overlapping, striate, appressed scales. Legs: Spines on ventro-medial margin of tibiae 1 and 2 slightly developed; tibia 3 broadly emarginate on medial margin in apical half; corbel of tibia 3 narrowly closed with short, acute setae encroaching on corbellar area. Abdomen: Ventrites 1 and 2 concave at middle in male; ventrite 5 approximately 1/3 broader, at widest point, than long; integument largely concealed by dense vestiture of scales and setae. Genitalia: Males ( Fig. 58 ): Aedeagus thin, long, slightly curved ventrally, apex of median lobe produced as long, acute projection viewed laterally or posterodorsally; median lobe long, manubrium of tegmen approximately 3/4 length of median lobe; median struts approximately as long as median lobe not including apical projection; internal sac without sclerites.

Geographical Distribution. Weevils of this species are known from only two localities in northwestern Oregon ( Map 9 ).

Type Material. Holotype female: “ Goose Lake / Modoc Co. / Cal V-24-49; R. M. Bohart / Collector” ( UCDC) . Paratype male: “ Round Mt. / Shasta Co. Cal. / V.23.1949 / R.M. Bohart / Collector” ( UCDC) .

Specific Epithet. The specific epithet, a Latin noun in apposition, refers to the thin and pointed elytral setae.

Diagnosis. The long scape, extending to the hind margin of the eye, is a character shared with P. spantoni , P. squamosus , P. michelbacheri , P. convergens , and P. oregonensis . The equally convex elytral intervals and a row of setae on all intervals serve to separate this species from P. torpidus , P. convergens , and P. oregonensis , all of which have the alternate intervals raised and the even intervals non-setose, or nearly so. The brown vestiture of scales and sparse, decumbent, thin setae serve to distinguish this species from specimens of P. squamosus , which have squamose and appressed elytral setae, and P. michelbacheri , which have a much sparser vestiture and much underlying integument visible, giving them a nearly black color.

Description. Females: Length 8.05 mm; length of pronotum 1.95 mm; width of pronotum 2.07 mm; length of elytra 4.30 mm; width across elytra at widest point 3.16 mm; width across head at anterior margin of pronotum 1.36 mm; width of frons between eyes 0.78 mm; length of rostrum from apex to anterior margin of eye 1.33 mm; length of scape 1.36 mm. Males: length 7.20 mm; length of pronotum 1.85 mm; width of pronotum 1.80 mm; length of elytra 3.85 mm; width across elytra at widest point 2.45 mm; width across head at anterior margin of pronotum 1.35 mm; width of frons between eyes 0.65 mm; length of rostrum from apex to anterior margin of eye 1.20 mm; length of scape 1.30 mm. Color: Brown, with areas of lighter colored scales laterally on prothorax and elytra; integument variable from piceous on pronotum to rufescent on venter. Head: Eye oval, frons continuous with rostrum in lateral view, frons wider than rostrum at base, rostrum narrowest at middle, widest near apex in dorsal view, median longitudinal carina on rostrum extending from between eyes to apex, apically in contact with V-shaped carina at posterior margin of nasal plate; scrobes deep and distinct near insertion of antennae, indistinct elsewhere. Antennae: Attached dorsolaterally near apex of rostrum; scape long, extending to posterior margin of eye when retracted next to head; vestiture of dense, appressed, striate scales and sparsely distributed, thin but flattened, decumbent setae directed distally. Pronotum: Median longitudinal sulcus short, narrow groove at middle with small depression at anterior third; dorsal surface covered with rugae and punctures, lateral margins roundly convex; widest anterior to middle; postocular lobes distinctly developed, with very short vibrissae on anterior margin; vestiture of appressed, striate scales with integument visible among scales dorsally, scales more densely overlapping laterally; with scattered, decumbent, narrow, flattened setae. Elytra: Together oval in form, wider than prothorax, firmly fused along midline (no longer so in dissected holotype), posterior declivity of elytra reflexed, sloped ventro-anteriorly in lateral view in female; rounded, not reflexed, sloped ventro-posteriorly in male; intervals slightly convex, each serial puncture of striae with nearly round scale; surface covered with dense, overlapping, appressed, striate, nearly round scales, even intervals with single row of narrow, flattened, decumbent setae, alternate intervals with irregular, mostly double row of such setae. Legs: Tibiae 1 and 2 each with 3 or 4 stout spines in distal half on ventral margin; tibia 3 without such spines, long, thin setae only on ventral margin; corbellar area closed on tibia 3, covered by appressed setae. Abdomen: Ventrites densely squamose; ventrite 1 slightly convex at middle in female, concave in male, approximately 0.6X as long (measured along midline of abdomen) as wide. Genitalia: Females ( Figs. 9 , 35 ): Tergum VIII broadly rounded dorsally, roughly conical in shape, rounded and setose apically, sternum VIII (spiculum ventrale) broadly shovel-shaped in distal quarter, setose apically; coxites conical, narrowing apically in dorsal view; styli with 2 setae at apex; pair of crescent-shaped sclerites present in vagina. Males: Aedeagus thin, moderately curved in lateral view, convex dorsally, concave ventrally (un-extended condition); apex of median lobe angular in dorsal view, with acute apical projection viewed posterodorsally; manubrium of tegmen shorter than length median lobe; median struts as long as median lobe; internal sac with finely granular texture throughout length, without sclerites internally.

Life History. Nothing is known of the life history of this species.

Geographical Distribution. This species is known only from two California specimens, one from the Goose Lake area, Modoc County and the other from Round Mountain , Shasta County ( Map 10 ) .

Chorological Affinities. See this topic for P. oregonensis above.

Material Examined. Only the female holotype and male paratype listed above were examined.

Figures

Map 9. Geographical distribution of Panscopus oregonensis.

Map 10. Geographical distribution of Panscopus acutisetus.

Figs. 9–16. Panscopus species, sternum 8 (spiculum ventrale), ventral (a) and left lateral (b) views. 9) P. acutisetus; 10) P. gemmatus; 11) P. spantoni; 12) P. squamosus; 13) P. michelbacheri; 14) P. johnsoni; 15) P. bakeri; 16) P. longus. Scale bar = 1 mm.

Figs. 33–36. Panscopus species, coxites and vagina, dorsal (a), ventral (b), and left lateral (c) views. 33) P. capizzii;

Figs. 56–58. Panscopus species, aedeagus. Dorsal (a), ventral (b), and left lateral (c) views of 56) P. capizzii and 57) P. convergens; dorsal (a), left lateral (b), and postero-dorsal (c) views of apex of 58) P. oregonensis. b = belt of tegmen; is = internal sac; mb = manubrium of tegmen; ml = median lobe; ms = median strut; t = tegmen. Scale bar = 1 mm.