Asydates washoe Mayor and Gimmel

Mayor, Adriean J. & Gimmel, Matthew L., 2019, Revision of the Soft-Winged Flower Beetles of the Genus Asydates Casey, 1895 (Coleoptera: Melyridae: Dasytinae: Listrini), The Coleopterists Bulletin (mo 17) 73, pp. 1-71 : 40-42

publication ID 10.1649/0010-065X-73.mo17.1

persistent identifier

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scientific name

Asydates washoe Mayor and Gimmel

new species

10. Asydates washoe Mayor and Gimmel, new species ( Figs. 5C–D View Fig , 9C–D View Fig , 13A–B View Fig , 17A–B View Fig , 18C View Fig , 26E View Fig , 29D View Fig , 32B View Fig , 37B View Fig , 40 View Fig )

Type Material. Holotype ♂ deposited in CAS (holotype #19844), labeled “ USA: NV: Lyon Co., 4.5 mi. \S. of Sweetwater Summit \on Hwy. 338, elev. 1898 m.\ N38°27’39.3”, W119°10’10.9” \ 7 Sept 2018, A. J. Mayor [white printed label] //Collected beating \flowers of \ Eriogonum microthecum [white printed label] // HOLOTYPE \ Asydates \ washoe \Mayor & Gimmel 2019 [red printed label]” GoogleMaps . Paratypes: 209 specimens listed in the Material Examined section include the additional label “ PARATYPE \ Asydates \ washoe \Mayor & Gimmel 2019 [yellow printed label]” .

Diagnosis. The unique shape of the aedeagus ( Fig. 26E View Fig ) and the fact that the species is known only from the western Great Basin Desert of Nevada and adjacent California ( Fig. 37B View Fig ) distinguish A. washoe from all other species of Asydates .

Description. Body elongate, moderately graciliform, shiny ( Figs. 5C–D View Fig , 9C–D View Fig ); microsculpture sparse, inconspicuous on head, pronotum and elytra. Length 2.6 mm (2.1–2.9 mm, n = 20); width 1.0 mm (0.8–1.1 mm, n = 20). Head, pronotum, elytra, and venter black, female abdominal ventrites 3–5 orange, sometimes 1–5 orange, male terminal ventrite often suffused with orange; elytra with apex orange to orange brown; male legs black suffused with reddish orange, female legs orange; antennomeres darker, reddish brown. Pubescence dense, reclining, pale, whitish to golden; pronotal and elytral fringe short. Punctation with punctures fine, indistinct on pronotum, slightly larger, more distinct on head and elytra. Head: Large, male temporal region short, narrower than pronotum in both sexes, eyes bulging in both sexes ( Fig. 13A–B View Fig ); 1.50 (1.33–1.58, n = 20) times wider than interocular distance. Antennomeres 5–10 weakly serrate; male antennae short, reaching to near middle of pronotum posteriorly, female antennae shorter. Thorax: Pronotum slightly wider than long, 0.83 (0.77–0.89, n = 20) times as long as wide; widest at middle; lateral edges converging to anterior margin, slightly constricted before anterior margin; anterior and posterior angles obsolete, broadly rounded ( Fig. 17A–B View Fig ). Elytra elongate, broadly oval, elytron 3.89 (3.50–4.25, n = 20) times as long as wide, at humeri slightly wider than pronotum; elytral epipleuron distinct at base, becoming obsolete near apex of abdominal ventrite 4 in both sexes; apical margin broadly rounded to sutural angle, inconspicuously serrulate in both sexes. All tibiae with fine, white setae along external margin; pro- and mesotibiae with numerous short, stout spines sparsely arranged along external margin in both sexes ( Fig. 18C View Fig ). Abdomen: Male ventrite 1 with indistinct median patch of white setae. Pygidium unmodified in male, with a shallow median emargination in female. Median lobe of aedeagus a bowed tube with apex straight ( Fig. 26E View Fig ); tegmen relatively short and wide, with slight constriction at base of ring ( Fig. 29D View Fig ).

Etymology. The species name honors the Native American Washoe people who historically inhabited the area around Reno, Nevada and adjacent California. The name is treated as a noun in apposition.

Host Plant Associations. Adults of A. washoe have been collected from the flowers of plants in the

families Asteraceae [ Ericameria nauseosa (4), Ericameria nauseosa consimilis (3), and Grindelia squarrosa (24)] and Polygonaceae [ Eriogonum microthecum (68) ( Fig. 32B View Fig ) and Eriogonum wrightii (99)].

Seasonal Distribution. 1 June to 7 September ( Fig. 40 View Fig ).

Geographic Distribution. Known only from Washoe County, Nevada south to Inyo County, California ( Fig. 37B View Fig ).

Material Examined. Records reported here are based on the examination of 210 specimens. USA: CALIFORNIA: Inyo County: Carroll Canyon , 1 June 1937, J. W. Johnson (paratype, 1♂, EMEC) ; Westgard Pass , 24 August 1960, C. A. Toschi (paratypes, 2♂♂, 1♀, EMEC) ; Mono County: Antelope Valley , ∼ 1 mi. N of Coleville, elev. 1,568 m, N38°34’50.1”, W119°30’41.7”, 19 August 2018, A. J. Mayor, collected beating flowers of Ericameria nauseosa (paratypes, 2♂♂, 2♀♀, UCRC) GoogleMaps ; same except collected beating flowers of Eriogonum wrightii (paratypes, 8♂♂, 16♀♀, UCRC, 2♂♂, 2♀♀, SBMNH) ; same except collected beating flowers of Grindelia squarrosa (paratypes, 6♂♂, 16♀♀, UCRC, 1♂, 1♀, SBMNH). NEVADA: Douglas County : N. end of Topaz Lake on Topaz Park Rd. , elev. 1,520 m, N38°41’53.8”, W119°31’57.0”, 20 August 2018, A. J. Mayor, collected beating flowers of Eriogonum wrightii (paratypes, 4♂♂, 8♀♀, UCRC) GoogleMaps ; same except 7 Sept. 2018, A. J. Mayor, collected beating flowers of Eriogonum wrightii (paratypes, 33♂♂, 20♀♀, UCRC, 3♂♂, 3♀♀, SBMNH). Lyon County: 4.5 mi. S of Sweetwater Summit on Hwy. 338, elev. 1,898 m, N38°27’39.3”, W119°10’10.9”, 7 Sept. 2018, A. J. Mayor, collected beating flowers of Eriogonum microthecum (holotype ♂, CAS, paratypes, 37♂♂, 24♀♀, UCRC, 3♂♂, 3♀♀, SBMNH) GoogleMaps ; Washoe County: 2 mi. N Reno , ix-6-57, Chrysothamnus nauseosus ssp. consimilis, B. J. Adelson Collector (paratypes, 2♂♂, 1♀, EMEC) .

Remarks. Asydates washoe is a nondescript species that can only be reliably differentiated from other species of Asydates by the unique shape of the median lobe of the aedeagus ( Fig. 26E View Fig ). Also, the species is known only from the Great Basin Desert of western Nevada and adjacent California, where no other Asydates species are known to occur.


California Academy of Sciences


Essig Museum of Entomology


University of California, Riverside


Santa Barbara Museum of Natural History