Asydates tongva 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 : 16-18

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

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scientific name

Asydates tongva Mayor and Gimmel

new species

5. Asydates tongva Mayor and Gimmel, new species ( Figs. 3A–B View Fig , 8A–B View Fig , 11C–D, 15C–D, 20C, 25E–F, 28E, 31B, 34A, 37A, 39)

Type Material. Holotype ♂ deposited in CAS (holotype #19842), labeled “CA: San Bernardino Co., San \ Bernardino Natl. Forest \ Lytle Creek Rd.; elev. 1528 m.\ N34 °17’41.6”, W117 °34’04.8” \ 26 July 2016; A. J. Mayor [white printed label] //Collected beating \flowers of \ Stephanomeria pauciflora [white printed label] // HOLOTYPE \ Asydates \ tongva \Mayor & Gimmel 2019 [red printed label]” GoogleMaps . Paratypes: 106 specimens listed in the Material Examined section include the additional label “ PARATYPE \ Asydates \ tongva \Mayor & Gimmel 2019 [yellow printed label]” .

Diagnosis. The pronotal fringe with dense setae, median lobe of the aedeagus broad apically, apex not flared, with a shallow arcuate excavation in dorsal view, and medially denuded female terminal ventrite without pale, whitish setae distinguish A. tongva from other species of Asydates .

Description. Body broad, moderately robust, suboval ( Figs. 3A View Fig , 8A View Fig ), slightly flattened in female ( Figs. 3B View Fig , 8B View Fig ), shiny; microsculpture sparse, inconspicuous on head, pronotum, and elytra. Length 2.8 mm (2.3–3.1 mm, n = 20); width 1.0 mm (0.9–1.1 mm, n = 20). Head, pronotum, and elytra black; elytral apices, legs, female ventrites and male terminal ventrite orange; antennomeres darker, reddish brown. Pubescence dense, reclining, pale, whitish, rarely slightly golden; pronotal and elytral fringe short, dense. Punctation with punctures fine, indistinct on head, pronotum, and elytra. Head: Large, short, typically narrower than pronotum in both sexes, eyes bulging (Fig. 11C–D); male head 1.46 (1.37–1.56, n = 10), female head 1.60 (1.44–1.73, n = 10) 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 0.81 (0.77–0.85, 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. 15C–D View Fig ). Elytra elongate, bars = 1.0 mm.

broadly oval, elytron 3.96 (3.44–4.43, n = 20) times as long as wide, at humeri slightly wider than pronotum; elytral margins broadly explanate, epipleuron broad to near apex, most pronounced in female; apical margin not broadly rounded, flattened apically, serrate in both sexes, sutural angle produced posteriorly. All tibiae with fine, white setae along external margin; pro- and mesotibiae with short, stout spines sparsely arranged along external margin, inconspicuous in both sexes. Abdomen: Male ventrite 1 with indistinct median patch of white setae. Male pygidium unmodified, with shallow median emargination in female. Female ventrite 5 covered with short, sparse, pale setae, denuded medially ( Fig. 20C View Fig ). Median lobe of aedeagus a bowed tube with region beyond dorsal orifice elongate and distinctly, evenly curved dorsally in lateral view ( Fig. 25E View Fig ); in dorsoventral view, with a wide, flat, non-flared apex slightly narrowed apically, apex shallowly, indistinctly emarginate ( Fig. 25F View Fig , ventral view); tegmen relatively elongate, with distinct constriction at base of ring ( Fig. 28E View Fig ).

Etymology. The species name honors the Native American Tongva people who historically inhabited the Los Angeles Basin and Channel Islands and summered in the higher elevations of the San Gabriel Mountains. The name is treated as a noun in apposition.

Host Plant Associations. Adults of A. tongva were collected from the flowers of plants in the family Asteraceae [ Lepidospartum squamatum (1) and Stephanomeria pauciflora (106) ( Fig. 34B View Fig )].

Seasonal Distribution. 13 July to 7 August ( Fig. 39 View Fig ).

Geographic Distribution. Known only from the Lytle Creek drainage ( Fig. 31B View Fig ) of the San Gabriel Mountains, San Bernardino County, California ( Fig. 37A View Fig ).

Material Examined. Records reported here are based on the examination of 107 specimens. USA: CALIFORNIA: San Bernardino County: San Bernardino Natl. Forest, Lytle Creek Rd. , 1,487 m, N34°17’44.1”, W117°34’07.2”, 13 July 2016, A. J. Mayor, collected on flowers of Stephanomeria pauciflora (paratypes, 2♂♂, 1♀, UCRC) GoogleMaps ; same except Lytle Creek Rd. , 1,528 m, N34°17’41.6”, W117°34’04.8”, 26 July 2016, A. J. Mayor, collected beating flowers of Stephanomeria pauciflora (holotype ♂, CAS, and paratypes, 36♂♂, 26♀♀, UCRC, 3♂♂, 3♀♀, SBMNH) GoogleMaps ; same except N34°17’44.9”, W117°34’11.4”, 1,523 m, 7 August 2016, A. J. Mayor, collected beating flowers of Lepidospartum squamatum (paratype, 1♂, UCRC) GoogleMaps ; Middle Fork Lytle Creek on Middle Fork Rd. , elev. 1,130 m, N34°15’15.8”, W117°32’10.8”, 25 July 2017, A. J. Mayor, collected beating flowers of Stephanomeria pauciflora (paratypes, 15♂♂, 13♀♀, UCRC, 3♂♂, 3♀♀, SBMNH) GoogleMaps .

Remarks. Asydates tongva is remarkable for its distribution, which appears to be restricted to the Lytle Creek drainage of the eastern San Gabriel Mountains.

Asydates tongva is most closely related to A. rufiventris and A. chumash. See Remarks under A. chumash for a discussion of the characters differentiating these three species.


California Academy of Sciences


University of California, Riverside


Santa Barbara Museum of Natural History