Magdalinops alutaceus (Hatch) Clark, Wayne E. & Burke, Horace R., 2002

Clark, Wayne E. & Burke, Horace R., 2002, Revision Of The Weevil Genera Magdalinops Dietz And Chelonychus Dietz (Coleoptera: Curculionidae, Anthonomini), The Coleopterists Bulletin 56 (1), pp. 107-122 : 19-21

Magdalinops alutaceus (Hatch) , new combination

Figs. 5, 6 , 9 , 13 , 16 , 19 , 23

Epimechus alutaceus Hatch 1971:345 . Holotype. United States. Washington. Grant Co.: [WASH: Dry Falls /14–15 May, 1960/ M. H. Hatch] [Type // Epimechus /alutaceus/1968— M. Hatch] [Type // Anthonomus /(s.str.)/ alutaceus/1965— M. Hatch] (/, USNM).

Description. Body ( Figs. 5–6 ): robust, broad, parallel­sided in dorsal view; length 1.7–3.5 mm; width 0.8–1.6 mm. Integument black, moderately exposed between narrowly to non­imbricated cinereous scales. Head: vertex minutely punctate, finely granulate, with sparse, small, rounded cinereous scales. Rostrum: slender, slightly, evenly curved from base to apex; proximal portion rugose, glabrous; lateral rostral groove broad, punctulate, glabrous; dorsal margin of groove carinate, posteroventral margin delimitated by transverse carina extending from eye to lower margin of rostrum; distal portion rugulose, punctulate, glabrous. Antenna: funicular segments with narrow, setiform scales; basal segment of club ca. 1/3 length of club, glabrous at base, densely setose distally. Prothorax: pronotum densely, coarsely punctate, without middorsal carina; small, apically rounded, cinereous scales predominant laterally and in ill­defined middorsal vitta, intermixed among narrower fuscescent scales dorsolaterally; mesocoxae separated by distance ca. 0.3 3 width of one mexocoxa. Elytra: subparallel­sided in dorsal view, slightly convex on disc and strongly rounded posteriorly in lateral view; striae slightly impressed, each puncture with one minute setiform scale; interstriae flattened, subequal in width, with dense, uniform vestiture of apically rounded, slightly imbricated to non­imbricated, cinereous scales; sutural interstriae not prominent. Scutellum : with dense cretaceous scales. Abdomen: sterna 1–4 with narrow, pallid scales laterally, with sparser, narrower scales medially. Legs: profemur stout, unarmed; metafemur unarmed ( Fig. 13 ); protibia narrow, straight, with slight, broad, inner­marginal prominence in basal 1/3 and with one slight preapical prominence; protibial uncus curved, acute; metatibia with outer margin straight,

THE COLEOPTERISTS BULLETIN 56(1), 2002 115

oblique in lateral view ( Fig. 13 ); tarsal claw with long, slender, acute, basal tooth arising from inner margin, well distad of base ( Fig. 16 ). Male Genitalia ( Fig. 23 ): median lobe of aedeagus slightly constricted subapically, evenly, gradually narrowed to narrowly rounded apex in dorsal view; endophallus unarmed.

Specimens Examined. In addition to the holotype from Washington , 118 specimens of M. alutaceus from the following localities were examined. Canada . British Columbia. Oliver (1, CASC) . United States. California. Modoc Co.: 18 mi. E Cedarville (1, USNM) . San Diego Co.: El Cajon (1, OSUC) .

Colorado. Larimer Co.: Estes Park (1, SEMC). Routt Co.: Hahns Peak Lake (3, CWOB). Idaho. Bannock Co.: (1, CWOB). Blaine Co.: Rock Creek (3, CWOB). Caribou Co.: 1 mi. N Soda Springs (5, BYUC). Cassia Co. : City of Rocks (1, CMNC); 8 mi. W Elba (1, CMNC); Fairchild Creek, Elba­Basin Pass (2, CMNC). Clark Co.: 6 km. S Kilgore (1, CMNC). Franklin Co.: Cub River Canyon (1, TAMU); Franklin Basin (2, TAMU). Fremont Co.: 26 km. NW St. Anthony (1, HAHC). Jefferson Co.: 20 mi. N Terreton (1, CMNC).

Montana. Gallatin Co.: Earthquake Lake (1, CWOB). North Dakota. Billings Co.: Elkhorn Ranch (1, TAMU); Theodore Roosevelt National Memorial Park (1, TAMU). Oregon. Baker Co.: Durkee (1, OSUO). Deschutes Co.: Redmond (1, TAMU). Harney Co.: ‘‘P’’ Ranch (1, OSUO). Lake Co.: Warner Valley (1, OSUO). Utah. Highway 89, 8 km. W Tony Grove Lake (1, CMNC). Cache Co.: Green Canyon (‘‘sage,’’ 1, USNM); Logan (1, USNM); Logan Canyon (1, USNM). Daggett Co.: McKee Draw (‘‘ Artemisia cana , ’’ 29, CWOB). Duchesne Co.: Lime Kiln Spring (3, BYUC); 3 mi. N Mountain Home (2, BYUC), 2 mi. E Tabiona (1, BYUC); Yellowstone Creek (3, BYUC). Summit Co.: Park City (1, CMNC). Uintah Co.: Brush Creek (‘‘ Artemisia tridentata , ’’ 3, CWOB); North Fork, Duchesne River (1, CUIC). Utah Co.: 2 mi. N Pleasant Grove (2, BYUC); Provo (1, USNM; 1, BYUC); 7 mi. E Springville (‘‘ Artemisia tridentata , ’’ 24, BYUC); South Fork of Provo River nears Bunnells Fork (‘‘ Artemisia tridentata , ’’ 7, CMNC). Washington. Okanogan Co.: Brewster (‘‘on Artemisia , ’’ 1, CASC). Yakima Co.: White Swan (1, USNM). Wyoming. Teton Co.: 7 mi. S Jackson (1, CWOB); Yellowstone National Park: Mammoth Hot Springs (1, CWOB).

Plant Associations. Label data indicate that adults of M. alutaceus have been collected on Artemisia cana and A. tridentata .

Remarks. Hatch (1971:341) placed M. alutaceus in Epimechus Dietz which he characterized as having the tarsal claws ‘‘minutely toothed... or simple.’’ However, the species has the diagnostic characters of Magdalinops and is transferred to that genus as M. alutaceus (Hatch) .

Magdalinops alutaceus exhibits variation in body size and form, in the density of the vestiture of the pronotum and elytra, rostral length, the development of the tooth on the tarsal claws, and in the shape of the median lobe of the aedeagus. The range of size of individuals is considerable. The smallest specimens, invariably males, have the rostrum short and stout. There is also a corresponding reduction in the density of the vestiture of the pronotum and elytra and in the size of the individual scales. The tooth of the tarsal claw of the smallest specimens also tends to be shorter in relation to the length of the claw in larger individuals. The gap separating the extremes is filled, however, by individuals of intermediate size. Expression of the other characters is also intermediate. The median lobe of aedeagus of some specimens of M. alutaceus is more slender and more parallel­sided than the example illustrated ( Fig. 23 ).

116 THE COLEOPTERISTS BULLETIN 56(1), 2002

compact and ovoid like that of M. vittipennis , but the middle coxae are not as narrowly separated by the mesosternum. Nevertheless, M. alutaceus closely resembles M. vittipennis in the structure of the rostrum and similarly has the lateral rostral groove delimitated basally by a transverse carina that extends from the eye to the lower margin of the rostrum.

Figures

Figs. 5–8. Magdalinops spp., habitus. 5) Magdalinops alutaceus, habitus, /, holotype; 6) M. alutaceus, /, holotype; 7) M. falli, /, Pasadena, California; 8) M. falli, /, Pasadena, California.

Figs. 9–10. Magdalinops spp., head and thorax, lateral view. 9) M. alutaceus, head and thorax, /, 7 mi. E Springville, Utah; 10) M. falli, /, Claremont, California.

Figs. 11–14. Magdalinops spp., metathoracic leg. 11) M. vittipennis,?; 12) M. knowltoni,?; 13) M. alutaceus,?; 14) M. falli,?.

Figs. 15–17. Magdalinops spp., tarsal claws, right prothoracic leg, /, dorsal view.

Figs. 18–20. Magdalinops spp., tarsal claws, right metathoracic leg, lateral view. 18) M. vittipennis, /; 19) M. alutaceus, /; 20) M. knowltoni,?.

Figs. 21–24. Magdalinops spp., aedeagus, dorsal view. 21) M. vittipennis; 22) M. knowltoni, holotype; 23) M. alutaceus, Brewster, Washington; 24) M. falli, holotype.