Panscopus (Phymatinus) michelbacheri Ting, 1938

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 : 36-38

Panscopus (Phymatinus) michelbacheri Ting, 1938

( Figs. 13 , 39 , 62 , Map 14 )

Panscopus michelbacheri Ting 1938: 121 . O’ Brien and Wibmer 1982: 63.

Panscopus (Nocheles) michelbacheri ; Blackwelder 1939: 66.

Type Material. Holotype male (CAS No. 4594): “ Nevada City / VI-27-37 Cal./ M. Cazier ” . Allotype female (CAS No. 4595): “ Nevada City / VI-27-37 Cal./ M. Cazier ” from a type series of 64 specimens “collected under wood and other\ debris”, by Dr. A. E. Michelbacher and M. A. Cazier ( Ting 1938) . Paratype material has been examined as follows: California: Nevada Co.: Nevada City, 27.VI.1937, Michelbacher (9, AMNH; 3, CASC; 1, LACM; 4, UCDC; 1, USNM); Nevada City , 27.VI.1937, M. Cazier (5, AMNH; 3, UCDC; 3, USNM); Placer Co., Emmlgrant Gap, 13.VI. 1937, M. Cazier (1, AMNH; 1, CWOB; 1, LACM; 1, UCDC) .

Specific Epithet. A patronym, based on the surname of A. E. Michelbacher, who, along with M. A. Cazier, collected the type series ( Ting 1938).

Diagnosis. Specimens of this species are recognized by the long scape extending to the hind margin of the eye and females with four ventrites, in combination with the following characters: elytral intervals even or at most slightly elevated near base; elytral declivity, in lateral view, describing a continuous curve to apex; elytral setae more decumbent than appressed, setae thin but flattened; black or nearly so.

Redescription. Females: Length 8.8–9.6 mm (n = 10); width across elytra 3.3–4.5 mm (n = 10). Males: Length 7.8–9.7 mm (n = 10); width across elytra 2.9–3.5 mm (n = 10). Color: Dark grey-brown to black; integument, where visible through vestiture of antennae, legs, and venter, rufescent. Head: Transverse depression at base of frons a small concavity medially; frons and rostrum continuous in lateral view; with thin, shiny, median longitudinal carina; without lateral rostral carinae; nasal plate not differentiated from dorsal surface of rostrum; with v-shaped carina; vestiture of rostrum and frons of scattered appressed, elongate scales and scattered decumbent, flattened setae, loose group of 10–14 decumbent, flattened, blunt setae supraorbitally. Antennae: Scape extendingd to or beyond hind margin of eye when resting next to head; scape vestiture of thin, appressed, distally directed setae, integument visible among setae; funiculus (antennomeres 2–8) with long primary setae on distal portion of each article, as well as short, fine secondary setae scattered over surface, more densely on distal articles; integument visible among setae. Pronotum: Approximately 1/5 wider than long in females, narrower in males, roundly convex laterally; widest at middle; surface coarsely punctate; median longitudinal sulcus reduced, or present as faint depression in anterior third and posterior third in many individuals; vestiture of scattered scales and flattened, blunt, appressed setae, integument visible through the vestiture. Elytra: Combined width approximately 3/4 length in females, slightly narrower in males, declivity rounded in lateral view, posterior margin nearly vertical in males, reflexed in females; intervals subequally convex, alternates not raised over level of even intervals except for sutural interval, each interval with irregular row of decumbent setae, serial pits each with slightly elongate scale; elsewhere, vestiture of appressed, striate scales. Legs: Tibiae 1 and 2 without obvious stiffened spines on ventral margins in most specimens; tibia 3 without obvious spines on ventral margin; corbellar area of tibia 3 indistinctly closed. Abdomen: With 4 ventrites in females, 5 ventrites in males; ventrite 1 convex at middle in females, concave at middle in males. Genitalia: Females ( Figs. 13 , 39 ): Sternum VIII (spiculum ventrale) as in other species of Phymatinus ; vagina long, membranous, with pair of crescent-shaped sclerites anteriorly near confluence of common oviduct; spermatheca sickleshaped, tapered in apical third to thin apex. Males ( Fig. 62 ): Aedeagus decurved, with a broad spatulate projection apically, as in P. spantoni and P. squamosus ; manubrium of tegmen approximately as long as median lobe, not including apical projection; median struts as long as median lobe including apical projection; internal sac with pair of

sclerites apically, joined together in form of inverted V-shaped structure located anteriorly in inverted sac; sac with field of small denticles distad belt of tegmen.

Life History. Adult specimens have been collected in March, May, and June.

Geographical Distribution. This species is known from Alameda, Nevada, and Placer Counties, California ( Map 14 ).

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

Material Examined. In addition to the holotype and paratype material listed above, the following eight specimens were examined. USA: California: Nevada Co., 12.V.1962, L. Magarian (1, CWOB; 2, USNM); 12.V.1962, Erwin #251 & #255 (2, CWOB) ; 12.V.1962, R.L. Penrose (2, CMNC) . Plumas Co., Quincy , VII.1922, Van Dyke Collection (1, CASC) .

Figures

Map 14. Geographical distribution of Panscopus michelbacheri.

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. 37–40. Panscopus species, coxites and vagina, dorsal (a), ventral (b), and left lateral (c) views. 37) P. spantoni;

Figs. 62–64. Panscopus species, aedeagus, dorsal (a), ventral (b), and left lateral (c) views. 62) P. michelbacheri; 63) P. johnsoni; 64) P. bakeri. b = belt of tegmen; is = internal sac; mb = manubrium of tegmen; ml = median lobe; ms = median strut; t = tegmen. Scale bar = 1 mm.