Panscopus (Pseudopanscopus) costatus Buchanan, 1927

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 : 21-22

Panscopus (Pseudopanscopus) costatus Buchanan, 1927

( Figs. 6 , 32 , Map 6 )

Panscopus (Pseudopanscopus) costatus Buchanan 1927: 33 ; Schenkling and Marshall 1931: 41; Buchanan 1936: 12; Blackwelder 1939: 66; Bousquet et al. 2013: 346.

Pseudopanscopus costatus ; Hatch 1971: 288.

Panscopus costatus ; O’ Brien and Wibmer 1982: 63; Bright and Bouchard 2008: 256.

Type Material. Holotype female ( USNM No. 28917): “Chilliwack, B. C. ex.: stomach Bufo boreas U. S. Biol. Survey 461. Pseudopanscopus costatus Buchanan, L. L. B. ’26”. The left hind tarsus of this specimen is glued in two parts on a point.

Specific Epithet. “ Costatus ” is a Latin adjective, meaning ribbed. This word probably was intended to refer to the ribbed or costate appearance of the elytra, having the alternate intervals raised to form low ridges.

Diagnosis. The subgeneric characters mentioned above, alternate elytral intervals costate, extending uninterrupted the length of the elytra, are sufficient to identify adult specimens as representatives of this species.

Pseudopanscopus Buchanan 1927: 33 . Gender masculine. Type species: Panscopus costatus Buchanan , by monotypy. Buchanan 1936: 3, 12; Blackwelder 1939: 66; Kissinger 1964: 36; Alonso- Zarazaga and Lyal 1999: 186; Anderson 2002: 782; Bousquet et al. 2013: 346.

Subgeneric Name. A Greek word, “ pseudo” means something which resembles something else, but is not. Thus, Pseudopanscopus is something which resembles, but is not, Panscopus (sensu stricto).

Diagnosis. Adults of this subgenus are recognized by a very broad, deep median longitudinal

Redescription. Females: Length 7.3–7.8 mm (n = 5); width across elytra 3.3–3.6 mm (n = 6). Males: Unknown. Head: Frons separated from rostrum, in lateral view, by broad, transverse depression between eyes; rostrum without carinae, or if present, carinae not evident through vestiture; angular nasal plate with distinct v-shaped carina; rostrum and frons with dense layer of appressed scales, rostrum with scattered, semi-erect, broad, flattened, setae; frons with dense group of 10–12 broad, flattened, semi-erect to erect setae supraorbitally. Antennae: Scape extended to middle of eye when next to head and rostrum; scape covered by dense layer of overlapping, striate, appressed scales concealing integument and scattered, semierect, broad, flattened, striate, scale-like setae; antennomeres 2–8 with dense vestiture of appressed short, fine (secondary) setae in addition to scattered decumbent longer, thin (primary) setae; antennomeres 2 and 3 not as elongate as in P. erinaceus , P. impressus , and others; antennomere 8 slightly wider than long. Pronotum: One-tenth to 1/6 wider than long; median longitudinal sulcus broad and distinct length of pronotum; dorsal surface irregularly rugose-tuberculate; vestiture of dense striate scales and scattered decumbent, flat, broad, striate scale-like setae. Metathorax: Metepisternal suture visible entire length as fine line. Elytra: Combined width approximately 4/5 length, widest at anterior third, thence narrowed apically; declivity curved, posterior margin straight and reflexed forward ventrally near apex in lateral view; anterior margin produced forward, in form of overhanging cliff at junction of elytra and thoracic nota; alternate (odd-numbered) intervals elevated, with double or partly triple row of decumbent to semi-erect, broad, flat, scale-like setae; even intervals flat or only slightly convex, setae few or absent; vestiture of dense overlapping striate, appressed scales light brown to beige in color. Legs: Tibiae 1, 2, and 3 each with row of 4–5 stiff spines, about length of surrounding setae, on ventro-medial margin in apical half, less obvious on tibia 3; femora and tibiae with dense vestiture of appressed, overlapping scales and scattered, decumbent, broad, flattened setae concealing integument; corbellar area of tibia 3 indistinctly closed, with short coarse setae. Abdomen: With 5 ventrites in females; dense vestiture as on legs and elytra. Genitalia: Female ( Figs. 6 , 32 ): Sternum VIII (spiculum ventrale) with apical expansion broad and spadeshaped, convex ventrally, cleft medially, with fine setae apically; coxites 1 and 2 narrowly angulartapered apically, styli with 2 or 3 primary setae apically; vagina copulatrix membranous, no sclerotized structures visible; spermatheca crudely sickleshaped, very stout basally, tapered markedly to thin apex.

Life History. Adult female specimens have been collected in the months of April, May, and June. Males are unknown.

Plant Associations. Two specimens bear labels indicating they were found on strawberry plants.

Geographical Distribution. Weevils of this species are known from a few localities in Oregon, northeastern Washington, and southern Vancouver Island , British Columbia ( Map 6 ) .

Chorological Affinities. The ranges of this species and P. capizzii are adjacent to one another but not overlapping.

Material Examined. In addition to the holotype, six specimens were examined. CANADA: British Columbia: Victoria , 21.VI.1928, W. Downes (1, CNCI) . USA: Oregon: Lane Co., Oakridge , 4.VI.1965, Scott McCleve (1, CMNC) . Washington: Pierce Co, Puyallup , 2.V.1932, J. Wilcox (1, OSUC) ; Puyallup , 22.IV.1933, W.W. Baker, R Hopping collection (1, CASC) ; Puyallup , 6.IV.1934, W.W. Baker, Schwab collection (1, UCDC) . “ Was ” (1, USNM) .

Figures

Map 6. Geographical distribution of Panscopus costatus.

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. 27–32. Panscopus species, coxites and vagina, dorsal (a), ventral (b), and left lateral (c) views. 27) P.maculosus; 28) P. ovatipennis; 29) P. alternatus; 30) P. erinaceus; 31) P. impressus; 32) P. costatus. cx = coxites; st = stylus. Scale bar = 1 mm.