Lymantes repens Casey, 1892

Anderson, Robert S., 2016, A Taxonomic Revision of the GenusLymantesSchönherr, 1838 (Coleoptera: Curculionidae: Molytinae: Lymantini) in the United States Ofamerica, The Coleopterists Bulletin 70 (1), pp. 111-124 : 111-124

Lymantes repens Casey, 1892 , new combination ( Figs. 6–7 , 15 , 20 )

Metopotoma repens Casey 1892: 690 . Hatch 1971:

309; O’ Brien and Wibmer 1982: 85. Anculopus foveatus Van Dyke 1927: 13 . Diotrophorus repens: Kuschel 1987: 14 ; Anderson

2002: 792.

Diagnosis. Eyes distinct, composed of 20–30 individually distinct facets ( Fig. 15 ). Antenna with last article of funicle extended apically and cover- ing base of club. Punctures of body generally large, deep, closely spaced, those of pronotal disc deep, large, very closely spaced, the distance between punctures less than diameter of a puncture ( Fig. 7 ). Punctures of striae of elytral disc large, deep, and linearly arranged, interstriae distinct, much narrower than diameter of a strial puncture; interstriae with scattered, low longitudinal tubercles, each tubercle indicated by a patch of fine micropilosity ( Figs. 6–7 ). Dorsal vestiture short and fine, each seta shorter than diameter of an elytral strial puncture ( Fig. 7 ). Legs rather robust, hind femora about 4X as long as wide, apex reaching slightly beyond suture between ventrites 2 and 3. Body size larger, 5.9 mm. Aedeagus as in Fig. 20 .

Description. Male, length 4.1 mm, width 1.6 mm. Color black throughout. Head globose, minutely finely reticulate. Eyes large, flat, composed of 20–30 individually distinct facets. Rostrum with antennae inserted slightly beyond apical 2/5 of length, slightly wider in dorsal view beyond antennal insertions, scrobes narrowly visible at point of antennal insertions in dorsal view. Rostrum about 0.6X pronotal length, slightly arcuate in lateral view, dorsally deeply, densely punctate, punctures separated by less than their own diameter. Ventrally moderately densely punctate, punctures distinct, separate, with median posterior extension represented by broad ridge, extended to base of rostrum between scrobes. Antennae with scape not reaching base of rostrum, funicle with articles 1 and 2 short, robust, subequal in length, articles 3–6 shorter, subquadrate, article 7 extended apically, covered base of club. Pronotal width about 0.6–0.7X length, lateral margins arcuate, widest about midlength, subapical constriction evident dorsally, impressed laterally as series of punctures, disc with punctures deep, large, very closely spaced, distance between punctures generally less than diameter of a puncture, each puncture with small, fine, suberect seta; midline raised and glabrous. Elytra about 1.6X as long as wide, lateral margins subparallel to slightly rounded from behind humeri to apical 1/4, humeri not pronounced, discal striae with large, deep, linearly arranged punctures numbering 10–18 per complete discal stria, interstriae with scattered, low, longitudinal tubercles, each tubercle indicated by a patch of fine micropilosity. Striae 1–6 complete to base, 7 and 8 fused opposite metacoxae, not continuous to base, striae 9 and 10 complete but 10 shallowly indicated to apex. Venter deeply, moderately densely, regularly punctate, punctures wellspaced, punctures lacking on ventrites 3 and 4. Abdominal ventrites 1 and 2 very long, 1 slightly shorter than ventrites 3–5 combined, 2 slightly shorter than ventrites 3 and 4 combined, ventrites 3 and 4 very short, subequal in length, ventrite 5 about as long as 3 and 4 combined. Legs moderately robust, sparsely shallowly punctate, punctures wellspaced, femora extended slightly beyond suture between ventrites 2 and 3, about 4X as long as wide, tibiae straight, moderately robust, about as long as femora. Tarsi slender, ventrally with few setae, tarsal claws small, fine. Aedeagus with pedon short, very slightly longer than wide; truncate apically; internal sac with extensive internal sclerotization in form of a pair of distal arciform sclerites, basally with medial sclerite complex flanked by elongate recurved bars; struts long, about 2X length of pedon.

Female differs from male as follows: length 5.1–5.9 mm, width 2.0– 2.3 mm. Rostrum with antennae inserted slightly proximad of apical 2/5 of length.

Taxonomic Notes. Metopotoma repens was placed in the genus Dioptrophorus by Kuschel (1987) when he placed the genus Metopotoma as a junior subjective synonym of Dioptrophorus . No reasons for the synonymy with Dioptrophorus were presented. I have examined types and numerous specimens of many Dioptrophorus species from throughout northern Central America and Mexico (but not including the type species Dioptrophorus ocularis Fahraeus, 1843 ) and consider these as non-congeneric with M. repens . Other than larger eye size and presence of some low, longitudinally oriented elytral tubercles, M. repens fits the diagnostic features of a species of Lymantes very closely. Dissection of male genitalia reveals an aedeagus very similar in shape and internal sac structure to the other USA species of Lymantes , not to Dioptrophorus . Thus, I here place Metopotoma repens Casey as Lymantes repens (Casey) , new combination.

Natural History. Specimens of L. repens have been sifted from various kinds of leaf litter in California and Oregon. One specimen was collected under spruce bark.

Distribution. This species is known from the western USA in the states of CA, OR, and WA. The WA record is from O’ Brien and Wibmer (1982), but I do not know the basis for this record.

Material Examined. California: Humboldt County, Blue Lake , 21.iv.1977, berlese from redwood duff (f, CDFA) . Prairie Creek State Park , 4.v.1963, W. Steffan, redwood duff (1 female, CWOB) . 9 mi. E. Carlotta , 1.x.1959, V.D. Roth (1 female, CWOB) . Arcata Community Forest , 9.i.1963, J. Pinto, berlese (1 female, CWOB) . Same data except 1.iv.1962 (1 female, CWOB) . Oregon: Coos County, Charleston , 23.vi.1957, K.M. Fender (1 female, CMNC) . Curry County, Humbug , 11.v.1955, V. Roth, myrtle duff (1 male, CASC) . 4.5 m. S. Goldbeach, 29.i.1967, virgin spruce and fern forest, under spruce bark in litter, V. Lee (1 female, CWOB) . Douglas County, Elliot State Forest , 1 mi. S., 2 mi. W. Ash, 11.xii.1971, 1100’, E.M. Benedict, big leaf maple duff and soil (1 male, 1 female, CMNC) . 12 mi. E., 9 mi. N. Tiller Entrance to South Umpqua Guard Station , 1600’, 11.xi.1972, E.M. Benedict, duff, EB-1052 (1 female, CMNC) . Polk County, Helmick State Park , 4.v.1972, J. Russell (1 male, OSUC) . Yamhill County, Sourgrass Creek , 4.vii.1956, K,M, Fender (1 male, CASC) .

Figures

Figs. 4–13. Lymantes species, lateral and dorsal habitus. 4–5) L. scrobicollis; 6–7) L. repens; 8–9) L. nadineae;

Figs. 14–18. Lymantes species, head, lateral view. 14) L. scrobicollis; 15) L. repens; 16) L. nadineae; 17) L. fowleri; 18) L. obrieni.

Figs. 19–23. Lymantes species, male aedeagus, dorsal view. 19) L. scrobicollis; 20) L. repens; 21) L. nadineae;