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

10. Asydates washoe Mayor and Gimmel , new species

Zoobank.org/ urn:lsid:zoobank.org:act:9F8BCCD6-67EE-4792-8A0B-28A2858AF8DF ( Figs. 5C–D , 9C–D , 13A–B , 17A–B , 18C , 26E , 29D , 32B , 37B , 40 )

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]” . 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 ) and the fact that the species is known only from the western Great Basin Desert of Nevada and adjacent California ( Fig. 37B ) distinguish A. washoe from all other species of Asydates .

Description. Body elongate, moderately graciliform, shiny ( Figs. 5C–D , 9C–D ); 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 ); 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 ). 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 ). 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 ); tegmen relatively short and wide, with slight constriction at base of ring ( Fig. 29D ).

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 ) and Eriogonum wrightii (99)].

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

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

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) ; 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) ; 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) ; 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 ). 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.

Figures

Fig. 5. Asydates species, dorsal habitus. A. vandykei: A) Male, B) Female. A. washoe: C) Male, D) Female. Scale bars = 1.0 mm.

Fig. 9. Asydates species, lateral habitus. A. vandykei: A) Male, B) Female. A. washoe: C) Male, D) Female. A. phantasma: E) Male, F) Female. A. inexpectatus: G) Male. Scale bars = 1.0 mm.

Fig. 13. Asydates species, frontal view. A. washoe: A) Male, B) Female. A. phantasma: C) Male, D) Female. A.

Fig. 17. Asydates species, pronota. A. washoe: A) Male, B) Female. A. phantasma: C) Male, D) Female. A. inexpectatus: E) Male.

Fig. 18. Asydates species, dorsal view of male protibia. A) A. irwini, B) A. shoshone, C) A. washoe.

Fig. 26. Asydates species, median lobe of aedeagus, right lateral view. A. ruficauda: A) CA: Riverside Co.: Lake Elsinore, B) CA: Riverside Co.: Sycamore Canyon Park, C) CA: Inyo Co.: Westgard Pass Road, D) UT: Washington Co.: Lytle Preserve. E) A. washoe, NV: Lyon Co.: 7.2 km south of Sweetwater Summit on Highway 338, F) A. inexpectatus, CA: San Bernardino Co.: 1.6 km north of Hodge. Scale bars = 0.5 mm.

Fig. 29. Asydates species, tegmen of aedeagus (apex directed upward). A) A. shoshone, NV: Elko Co.: 43.5 km south of Wells, B) A. ruficauda, CA: Inyo Co.: Westgard Pass Road, C) A. vandykei, CA: Alameda Co.: Irvington, D) A. washoe, NV: Lyon Co.: 7.2 km south of Sweetwater Summit on Highway 338, E) A. phantasma, UT: Emery Co.: Woodside, F) A. inexpectatus, CA: San Bernardino Co.: 1.6 km north of Hodge. Scale bars = 0.5 mm.

Fig. 32. Habitat for Asydates species. A) Open, flat valley 43.5 km south of Wells, Elko Co., NV, habitat of A. shoshone collected from flowers of Chrysothamnus viscidiflorus and Ericameria nauseosa. Photograph taken 7 July 2018 by Adriean J. Mayor. B) Roadside talus 7.2 km south of Sweetwater Summit along Highway 338, Lyon Co., NV, habitat of A. washoe collected from flowers of Eriogonum microthecum. Photograph taken 7 September 2018 by Adriean J. Mayor.

Fig. 37. Distribution of Asydates species. A) Localities of examined specimens of A. rufiventris (black dots), A. chumash (green squares), and A. tongva (yellow stars), B) Localities of examined specimens of A. irwini (black dots), A. washoe (yellow stars), A. shoshone (red triangles), and A. phantasma (blue squares).

Fig. 40. Seasonalities of adult Asydates species, by month, based on collection records in the Material Examined sections.