Panscopus (Dolichonotus) convergens Buchanan, 1936

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 : 24-25

Panscopus (Dolichonotus) convergens Buchanan, 1936

( Figs. 8 , 34 , 57 , Map 8 )

Panscopus (Dolichonotus) convergens Buchanan 1936: 10 . Blackwelder 1939: 66.

Panscopus convergens ; Hatch 1971: 289; O’ Brien and Wibmer 1982: 63.

Type Material. Holotype male: “Corvallis / ORE; 20-V. 1925 / E. R. Buckell; 17 Bu; TYPE/ USNM/ 50647; Panscopus / ( Dolichonotus ) / convergens / male TYPE Buchanan” ( USNM) . Paratype female: “Corvallis/ OR; 20-VI. 1925 / E. R. Buckell; 16 Bu; Panscopus / ( Dolichonotus )/ convergens / female paratype Buch.” ( USNM) .

Specific Epithet. The word “ convergens ” is a Latin adjective, based on “cum”, together, and “ vergo”, bend, incline, or tend toward. This proba- bly refers to the convergent angle of the lateral margins of the elytra through the mid-portion of their length, which are more nearly parallel in other species of this genus.

Diagnosis. Specimens with the above subgeneric characters, as well as abdominal ventrite 5 one-half to two-thirds as long as broad, alternate elytral intervals raised and costate, even intervals completely or nearly non-setose, and the setae of alternate intervals blunt-ended and slightly broadened and flattened, belong to this species.

Redescription. Females: Length 6.4–7.5 mm (n = 12); width across elytra 2.5–3.2 mm (n = 12). Males: Length 5.6–6.9 mm (n = 12); width across elytra 2.1–2.5 mm (n = 12). Head: Transverse impression at base of frons almost continuous with rostrum in lateral view; frons with short, narrow, shallow longitudinal sulcus, in some individuals short, narrow glabrous interruption of vestiture between eyes; rostrum apparently non-carinate in most individuals, but with 2 thin, small longitudinal carinae evenly concealed by vestiture in most individuals, some specimens with thin median longitudinal carina partly visible among scales of vestiture; angular nasal plate indistinct, not clearly delineated from rest of rostrum, v-shaped carina indistinct; vestiture of frons and rostrum of dense overlapping, appressed, striate scales and scattered, decumbent, broad, blunt setae, group of 10–12 such setae inserted supraorbitally. Antennae: Scape extendig to middle of eye, vestiture of appressed, elongate scales and scattered, decumbent setae, integument nearly obscured entire length; antennomeres 2–8 with few small, sparsely distributed, long, thin, decumbent setae directed apically and scattered, thin, fine, appressed secondary setae also directed apically; shiny integument visible length of funicle (antennomeres 2–8); secondary setae more numerous on antennomere 8; antennomere 8 nearly as broad as long. Pronotum: Approximately as wide as long; lateral margins less convex than in most Panscopus species , surface coarsely rugose-tuberculate; integument obscured by vestiture of overlapping, appressed, striate scales and scattered, decumbent, flattened, blunt setae; median longitudinal sulcus shallow, extending length of pronotum. Elytra: Widest at anterior sixth, thence narrowed slightly to apical quarter; lateral margins nearly straight for 2/3 of length in dorsal view. with shallow concavity between intervals 7 and 9 and opposite coxa 3 in lateral view; apical declivity rounded, posterior margin of elytra nearly vertical in lateral view in males, slightly reflexed in females; alternate intervals elevated, with partly double rows of decumbent, flattened setae, serial pits each filled with round to oval, striate scales, 1/2 larger in length and width than surrounding scales, integument obscured throughout with dense vestiture of overlapping, appressed, striate scales. Legs: Tibiae without obvious spines on ventro-lateral margin, corbel of tibia 3 indistinctly closed, with short, coarse, acute setae inserted near corbellar area; vestiture of femora and tibia as on prothorax and elytra. Abdomen: With 5 ventrites in females and males, vestiture of dense scales and setae, integument nearly obscured, ventrite 1, and to a lesser extent ventrite 2, concave at middle in males, slightly convex in females. Genitalia: Females ( Figs. 8 , 34 ): Sternum VIII triangular in apical expansion, with fine setae apically; coxites 1 and 2 angular in dorsal view, rounded apically in lateral view; vagina with pair of slightly crescent-shaped setae near anterior end; spermatheca more narrowly elbowed, not as broadly sickle-shaped as in most Panscopus species. Males ( Fig. 57 ): Aedeagus thin, slightly 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 approximately as long as median lobe; median struts as long as median lobe; internal sac with finely granular texture in posterior half (inverted sac) without sclerites internally.

Life History. Most specimens seen were collected in May, June, and July. A few specimens were collected in August, September, and November. At other times of the year, specimens have been collected from litter in March and December.

Plant Associations. No records were seen of specimens of P. convergens taken directly from any species of plant. Clues to their habitat affinity are gleaned from records of specimens taken from litter, including litter of noble fir ( Abies procera Rehder ), Douglas fir ( Pseudotsuga menziesii (Mirb.) Franco ; Pinaceae ), fern and Acer L. ( Sapindaceae ), Alnus Mill. (Betulaceae) and Picea A. Dietr. (Pinaceae) , and big leaf maple ( Acer macrophyllum Pursh. ).

Geographical Distribution. This species occurs in western Oregon at elevations between approximately 180 and 1,220 m ( Map 8 ) .

Chorological Affinities. The ranges of P. convergens and P. oregonensis overlap in western Oregon and are separated from the range of P. acutisetus .

Material Examined. In addition to the type material listed above, approximately 100 specimens were examined. USA: Oregon: Benton Co., Mary’ s Peak 1100 m, 17.V.1983, D.S. Chandler, sifted spruce litter (1, CWOB) ; Mary’ s Peak , 1220 m, 8.V.1958, B.D. Ainscough, Noble fir litter (2, OSAC) ; Philomath , 12.8 km W., 300 m, 12.V.1983, D.S. Chandler, sifted fern & Acer litter (1, CWOB) . Coos Co., Charleston , 17.VI, K. M. Fender (1, OSAC) ; Marshfield , 14.VI.1914, Van Dyke collection (6, CASC) ; Marshfield , 10.VI. 1914, Van Dyke collection (1, CASC) ; Marshfield ,

11.VI.1936, Van Dyke collection (24, CASC; 1, CMNC). Douglas Co., Ash, 1.6 km S. & 3.2 km W. Elliot State Forest, 340 m, 11.XII.1971, E.M. Benedict, big leaf maple litter (2, CMNC). Josephine Co., Silver Creek Falls, 1.VIII.1948, K.M. Fender (1, OSAC); Silver Creek, 2.VIII. 1944 (2, OSAC); Silver Creek Falls, 29.V.1938, K.Gray & J. Schuh (1, CWOB; 1, USNM). Lane Co., Camp Lane, 5.VIII.1958, J. Capizzi, litter (1, OSAC); Glenada, VI-VII.1951, B. Malkin (8, FMNH; 8, OSAC); Glenada, 1-15.VI.1952, B. Malkin (3, FMNH; 2, OSAC); Glenada, 19.V.-8. VI.1957, B. Malkin (2, FMNH). Lincoln Co., Devil’ s Lake, 25.IV, K.M. & D.M. Fender (1, OSAC); Nashville, 1.6 km N. 180 m, 20.XII. 1971, E.M. Benedict (3, CMNC); Waldport, 11.VI. 1962, D.R. Smith (1, UNSM); Waldport, 3.2 km E., 15.V.1933, D.S. Chandler, sifted Alnus & Picea litter (3, CWOB); Schooner Creek Road N.W., N.E. Sect. 25, T7S, R11W, 20m, 30.V.1999, R.L. Westcott (1, CMNC); 10.VI.1911, F.W. Nunenmacher (4, FMNH). Marion Co., 9 mi. S., 6 mi. E. Silverton, 26.III.1972, E.M. Benedict, moss festoons (1, CMNC). Multnomah Co., Portland, 22.V, Hubbard & Schwarz (1, USNM). Polk Co., Black Rock, 16 km S.W. Dallas, 27.VII.1960, D. Allen (1, UNSM). Tillamook Co., Hemlock, 5.IV.1949 (1, OSAC); Kiwanda Viewpoint, Cape Lookout, 600’, 4.XI.1972, E.M. Benedict (4, CMNC); Oceanside, 6.IX.1965, K. Goeden (1, ODAC); Sand Lake, 4 km N, 2.4 km N. 180 m, 4.XI.1972, E.M. Benedict (3, CMNC); 7 mi S.E. Blaine Forest Service Road 533, Suislaw National Forest, 1400’, 15.III.1972, E.M. Benedict, Douglas fir duff (7, CMNC). Yamhill Co., Boyer, 22.V.1937, soil sample #11 (1, OSAC); Boyer, 28.V.1939, 17.VI.1956, K. M. & D.M. Fender (2, OSAC).

Figures

Map 8. Geographical distribution of Panscopus convergens.

Figs. 1–8. Panscopus species, sternum 8 (spiculum ventrale), ventral (a) and left lateral (b) views. 1) P. maculosus; 2) P. ovatipennis; 3) P. alternatus; 4) P. erinaceus; 5) P. impressus; 6) P. costatus; 7) P. capizzii; 8) P. convergens. 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.