Cymatodera locusticauda Rifkind, 2020

Cymatodera locusticauda Rifkind , new species

zoobank.org/ urn:lsid:zoobank.org:act:

( Figs. 9 View Figs , 45 View Figs )

Specimens Examined. Holotype male: Mexico, Jalisco, 20 km W of Ciudad Guzman on Rd. to Nevado , 8-V-2006, beating roadside vegetation, Skillman & Hildebrandt ( CSCA) . Paratypes: 1 M ( JNRC), same data as holotype ; 1 M ( JNRC), 1 M ( CNIN), Mexico, Oaxaca, 2.7 km N Santiago Lachiguiri, El Porvenir , oak / TDF / pine, 1283 m, VI-11-2018, J. Rifkind, E. Martinez, colls.

Description ( Holotype). Length: 11 mm. Color: Body reddish testaceous; head, reddish brown; abdomen pale testaceous, ventrites 2–4 with brown blotches; elytra pale testaceous, with indistinct short, light brown, longitudinal streaks at base, an angulate, incomplete transverse, brown, postmedian fascia and a broader, V-shaped ante-apical fascia ( Fig. 9 View Figs ). Head: Surface rather densely, coarsely punctate and rugulose, clothed with fine, suberect and erect pale setae of various lengths; antenna elongate, slender; antennomeres 2–5 subconical, 6–10 subserrate; antennomere 2 about 1/3 the length of antennomere 3; antennomere 11 longer than antennomere 10, narrowed distally, apex subacute. Pronotum: Elongate, but less than 2× as long as wide; surface shining, transversely rugulose, vestiture as on head. Elytra: Elongate (together almost 3× as long as broad), disc flattened above; sides subparallel, gradually, arcuately convergent from posterior 1/5 to separately rounded, dehiscent apices; surface shining, moderately densely impressed with micropunctures, strial punctures coarse, deep, and regularly, closely spaced on anterior 2/5 of disc, thereafter irregularly distributed, and abruptly obsolete at posterior 1/5; vestiture moderately dense but inconspicuous, composed mostly of fine, suberect testaceous setae, intermixed with fewer longer, more robust suberect setae. Metaventrite: Broadly flattened at middle; surface finely, densely but shallowly rugulose/punctate, inconspicuously setose; spicules, carinae, and tubercles absent. Abdomen: Integument shining, moderately densely but inconspicuously setose laterally; ventrites 1–5 densely but shallowly granulate/rugulose; ventrite 5 ( Fig. 45 View Figs ) short and broad, sides slightly oblique, tumid, posterior angles subacute, posterior margin very broadly, arcuately emarginate; ventrite 6 ( Fig. 45 View Figs ) quadrate, sides arcuately expanded laterally, posterolateral angles produced, broadly flattened ventrally, not upturned posteriorly, their apices broadly subtruncate; posterior margin with deep and rather broad Ushaped emargination at middle; surface densely but shallowly granulate, inconspicuously but densely clothed anteriorly with short, stiff, erect testaceous setae; tergite 6 oblong, sides feebly subsinuate posteriorly; underside biconcave; posterolateral angles quadrate (each giving rise to an elongate setal dagger); posterior margin broadly subtruncate, thickened along edge, not inflected at middle. Aedeagus: Apex of phallus subsagittate.

Variation. Length ranges from 8–12.5 mm. The female is unknown.

Etymology. The specific epithet, Latin for “lobster tail,” refers to the shape, in ventral aspect, of the male pygidium of the new species. The name is treated as a noun in apposition.

Distribution. Known from Jalisco and Oaxaca states, Mexico.

Biology. The Oaxacan specimens were beaten from vegetation in a mixed transitional forest composed of tropical deciduous flora, oak, and pine.

Diagnosis. Males of C. locusticauda are distinguished from those of C. lucubrans by having the metaventrite rugulose rather than spicular, and the sixth abdominal tergite with the posterior margin subtruncate rather than inflected at middle. The shape of the sixth abdominal tergite will also serve to separate males of C. locusticauda from those of C. burkei .