Panscopus (Nocheles) tricarinatus 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 : 50-51

Panscopus (Nocheles) tricarinatus Buchanan, 1927

( Figs. 19 , 45 , 68 , Map 20 )

Panscopus (Nomidus) tricarinatus Buchanan 1927: 32 . Schenkling and Marshall 1931: 41; Buchanan 1936: 15; Blackwelder 1939: 66; Bousquet et al. 2013: 345.

Panscopus tricarinatus ; Hatch 1971: 291; O’ Brien and Wibmer 1982: 63; Bright and Bouchard 2008: 267.

Type Material. Holotype male ( USNM No. 28912): “ Hood River Rapids, Parkdale , Oregon, July 30, 1921, M. C. Lane, Coll.”

Specific Epithet. A Latin compound adjective composed of “tri ” meaning three and “carina ” meaning keel or ridge. This is in reference to the three parallel longitudinal ridges evident on the dorsal surface of the rostrum.

Diagnosis. Specimens of this species are distinguished by their tricarinate rostrum, tibia 3 nearly straight, all elytral intervals setose, and the prothorax widest at about the middle. Furthermore, the lower edge of tibia 3 is without stout spines in most individuals, but in some specimens a few spines are visible.

Redescription. Females: Length 5.5–6.5 mm (n = 10); width across elytra 2.4–2.8 mm (n = 10). Males: Length 5.3–6.3 mm (n = 10); width across elytra 2.1–2.4 mm (n = 10). Color: Brown. Head: Transverse impression at base of frons shallowly impressed, head and rostrum apparently nearly continuous in lateral view; 3 coarse, longitudinal carinae on dorsum of rostrum, carinae mostly obscured by vestiture of decumbent to semi-erect scales in some specimens; loose group of 6–8 semierect, flattened setae supraorbitally; nasal plate distinct, without vestiture on rest of rostrum; nasal carina indistinct, u-shaped. Antennae: Scape relatively short, extending to anterior margin of eye; integument obscured by vestiture of dense scales and scattered, decumbent setae over most of its length; proximal articles of funicle (antennomeres 2–8) with few thin, short setae and many decumbent, stout, long primary setae; distal annuli with fewer primary setae, more fine, short, appressed, secondary setae; antennomere 8 approximately as wide as long. Pronotum: One-sixth wider than long in females; slightly less wide in males; median longitudinal sulcus deeper at anterior third; surface rugulose; vestiture of dense, overlapping, striate scales and scattered, decumbent setae. Elytra: Broadly oval, combined width, on average, 72% length and nearly 1/2 wider than pronotum in females; slightly narrower in males, combined width 65% length, on average; alternate intervals raised more than even intervals, more pronounced in males; alternate intervals with double to partly triple rows of setae; even intervals with single row of decumbent, flat punctures, each with nearly round scale significantly larger than surrounding scales; elsewhere vestiture of dense layer of overlapping striate scales. Legs: Tibiae 1 and 2 with several amber-colored stout spines on ventral margin in apical half; tibia 3 without such spines in most specimens; corbel of tibia 3 narrowly and indistinctly closed, with very small, appressed scales inserted near corbellar area. Abdomen: With 5 ventrites in both sexes; median concavity in ventrite 1 and anterior portion of 2 in males; females with slight convexity in ventrites 1 and 2; medial concavity in form of shallow longitudinal sulcus in apical portion of ventrite 5 in males; ventrite 5 without such concavity in females. Genitalia: Females ( Figs. 19 , 45 ): Sternum VIII with apical expansion 1/3 length; pair of linear sclerites in vagina near confluence with common oviduct, not crescentshaped as in other species of this subgenus; spermatheca sickle-shaped, medium in width throughout. Males ( Fig. 68 ): Median lobe of aedeagus slightly decurved; apex broadly rounded with suggestion of apical acuity medially in posterodorsal view; manubrium of tegmen as long as median lobe; median struts slightly longer than median lobe; internal sac membranous, with finely granular texture posteriad belt of tegmen; with single small, v-shaped sclerite internally near apex of sac (anterior end of inverted sac).

Life History. All of the specimens of P. tricarinatus examined were collected during June or July.

Plant Associations. The only host-associated adults seen were a series of three collected near Mt. Hood, Oregon, on plants of the genus Lupinus L. ( Fabaceae ).

Geographical Distribution. All specimens seen of this species were from the vicinity of Mt. Hood, Oregon and Mt. Adams , Washington ( Map 20 ), collected at altitudes between 910 and 1,830 m .

Chorological Affinities. The range of P. tricarinatus is overlapped by the ranges of P. aequalis , P. abruptus , and P. rugicollis .

Material Examined. In addition to the type material listed above, approximately 250 specimens were examined. USA: Oregon: Hood River Co.: Hood River , VII.1931, R.H. Beamer (1, CMNC) ; Parkdale , 5.VI.1972, R.G. Rosensteil (1, CWOB) ; Parkdale. Hood River Rapids, 30.VII.1921, M.C. Lane (2, CASC; 1, USNM); Mt. Hood 910–1830 m, 20.VI.1925 (1, UCDC) ; Mt. Hood 910–1830 m, 21-26.VI.1925, E.C. Van Dyke (8, CASC) ; Mt. Hood, 1520–1830 m, 1.VII.1927, E.C. Van Dyke (70, CASC; 2, CMNC); Mt. Hood, Cloud Cap Inn , 26.VII.1961, D.R. Smith, Lupinus (3, OSAC) ; Mt. Hood Cloud Cap Road, 17-18.VII.1933, J. Wilcox (1, AMNH; 5, CASC; 29, OSAC); Mt. Hood Cloud

Cap Road , 21.VI.1935, J. Wilcox, 21.VI.1935 (44, OSAC) ; Mt. Hood Cloud Cap Road , 17& 18. VII.1933, S.E. Crumb, Jr. (16, OSAC) : Mt. Hood Cloud Cap Road , 22.VI.1935, S.E. Crumb, Jr. (2, OSAC) ; Mt. Hood, Cloud Cap Road 1370 m, 17. VII.1933, J. Wilcox (2, USNM; 1, UNSM) ; Mt. Hood, Homestead Inn , 15.VII.1933, K. E. Gibson (2, UICM) ; Mt. Hood. Homestead Inn , 30.VI.1927, E.C. Van Dyke (1, CASC) ; Mt. Hood. Homestead Inn , 1.VII.1927, E.C. Van Dyke (20, CASC) ; Mt. Hood, Homestead Inn , 3& 5.VII.1927, E.C. Van Dyke (2, CASC) . Washington: Yakima Co., Mt. Adams , 1220 m, 21.VI.1935, S.E. Crumb (4, UCDC) .

Figures

Map 20. Geographical distribution of Panscopus tricarinatus.

Figs. 17–26. Panscopus species, sternum 8 (spiculum ventrale), ventral (a) and left lateral (b) views. 17) P. torpidus; 18) P. ovalis; 19) P. tricarinatus; 20) P. bufo; 21) P. schwarzi; 22) P. coloradensis; 23) P. aequalis; 24) P. squamifrons; 25) P. abruptus; 26) P. rugicollis. Scale bar = 1 mm.

Figs. 41–46. Panscopus species, coxites and vagina, dorsal (a), ventral (b), and left lateral (c) views. 41) P. bakeri;

Figs. 68–70. Panscopus species, aedeagus, dorsal (a), ventral (b), and left lateral (c) views. 68) P. tricarinatus; 69) P. bufo; 70) P. schwarzi. b = belt of tegmen; is = internal sac; mb = manubrium of tegmen; ml = median lobe; ms = median strut; t = tegmen. Scale bar = 1 mm.