Phyllocladus bilobatus Young

Young, Daniel K., 2013, Two new species of Phyllocladus (Coleoptera: Pyrochroidae: Pyrochroinae) from China, with a key to males of the Chinese species, Zootaxa 3669 (1) : -

Phyllocladus bilobatus Young , new species

(Figs. 1–6)

Description of male. Length (L) from anterior of labrum to apex of elytra 14.8–17.2 mm (average = 16.3 mm; n = 3). Color of cranium, antennae, mandibles, legs, and venter rufopiceous to black; labial palpi testaceous; apex of labrum stramineous, portions of maxillary palpi and tarsi testaceous to rufotestaceous; pronotum and hypomera brick-red to rufopiceous suffused with black; scutellum brick-red to rufopiceous; elytra orange to ferrugineousorange.

PLATE 1. Figures 1–3. Phyllocladus bilobatus sp. nov., adult male: 1, habitus, dorsal view (scale bar = 10mm); 2, head, dorsal view (scale bar = 1mm); 3, head, left anterolateral view (scale bar = 1mm).

Head: Cranium (Figs. 2–3) with surface shallowly, moderately densely punctate, slightly more coarsely punctate on surface of labrum; surface of frons rough, rugulose; cranial apparatus with anterior excavations deep, well defined, extending beneath antennal insertions, posterior excavations broad, deep, rugulose. Labrum with anterior margin very shallowly emarginate; frontoclypeal suture well impressed, complete. Antennal scape and pedicel (Figs. 1, 4–5) shallowly, moderately densely punctate, with apparent isodiametric microsculpturing or microrugulae, clothed with very short setae; scape with anterior face obtusely curved apically, posterior face nearly straight; dorsal face feebly concave (Figs. 2,5), its length 2.2X its maximal width; pedicel expanded in distal half, its length 1.5X its maximal width. Antennomere three broadly triangular by virtue of flattened, broadly expanded ramus; antennomeres 4–10 with each ramus as long as or longer than that of preceding antennomere, sublamellate, antennomeres 3–11 bearing a dense vestiture of short, erect, golden to coppery setae. Posterior excavations of cranial apparatus (Figs. 2–3) separated anteromesally by broad, relatively flat frontal ridge, partially concealed in dorsal view by strongly elevated, hood-like vertex, the margin of which is sinuate and deeply, acutely emarginate mesally, hence bilobate; posterior inner rim of excavation beset with numerous long, anteriorly or anteromesally directed, fine, yellowish to coppery-golden setae; anterior excavations of cranial apparatus delimited laterally by antennal insertions.

Thorax: Pronotum (Fig. 1) shining, shallowly, sparsely punctulate, vestiture consisting of a moderately dense covering of fine, semierect to decumbent coppery-orange setae; sides subparallel, rounded anteriorly, pronotum slightly wider in apical quarter; disk slightly depressed mesally; pronotal base with well developed bead, very slightly emarginate mesally. Scutellum a little wider basally, distal margin broadly rounded, surface punctulate, covered with short fine, retrorsely decumbent, yellowish setae and a longer, decumbent apical setal fringe. Elytra elongate, fairly flat, covering abdomen, slightly explanate distally, each separately, broadly rounded apically; densely clothed in vestiture consisting of fine, coppery-orange setae; elytral surface inconspicuously costate or ribbed; humeral width (HW) 3.0–4.2 mm (average 3.7 mm); maximal width (W) 4.4–6.2 mm (average 5.5 mm) (Fig. 1).

Abdomen: Fifth and sixth ventrites with apical margins concavely emarginate (Fig. 6); that of fifth ventrite broadly, shallowly emarginate; apical margin of ventrites five and six densely clothed in short to elongate, retrorsely and mesally directed, stramineous setae.

Female: Unknown.

Larva: Unknown.

Type material. HOLOTYPE (3): CHINA (W - Hubei) Daba Shan // pass E Mt. Da Shennongjia, // 12 km NW Muyuping // 31° 30′ N / 110° 21′ E, 1950 m // (dry creek vall. / mix. decid. for.) // 16.–22./VII.2001 Wrase [13]; [Second label, pink card stock]: Auto-Montaged // digital image(s) // per D. K. Young; [Third label; pink card stock]: HOLOTYPE: // Phyllocladus // bilobatus // Young // Daniel K. Young (NMEG). PARATOPOTYPE (1 3): [first and second labels bear same data as holotype]; [Third label; pink card stock]: PARATOPOTYPE: // Phyllocladus // bilobatus // Young // Daniel K. Young (NMEG). PARATYPE (1 3): CHINA: N. Sichuan // Minshan Mountains // 15 km S. Nanping: 2000 m // 20 June 2005 // V. Patrikeev leg. // Exchange with Ilya Osipov; [Second label, pink card stock]: Auto-Montaged // digital image(s) // per D. K. Young; [Third label; pink card stock]: PARATYPE: // Phyllocladus // bilobatus // Young // Daniel K. Young (DYCC).

Distribution. As noted above, P. bilobatus is presently known from mountainous regions of northern Sichuan and far western Hubei provinces in central China. All specimens were collected in mid-June at elevations of 1950– 2000 meters (= 6398–6562 feet).

Etymology. The specific epithet, bilobatus , is derived from the Latin root, “ bi -” meaning “two” and the “New Latin” root, “ lobat- ” (= “lobed”). The epithet refers to the deeply, acutely emarginate vertex extending over the cranial excavations that appears bilobed (Figs. 1–3).

Diagnosis. Since it is presently known from males only, and because females of Phyllocladus are as yet difficult to characterize, the diagnosis is limited to a comparison with males of the other species in the genus. Like P. kasantsevi and P. cinnabarus , P. bilobatus has the vertex elevated, forming a “hood-like” extension partially concealing the posterior region of the cranial apparatus. The cranial apparatus is entirely exposed in P. grandipennis (Fig. 12) as well as Phyllocladus magnificus (Blair) and P. costatus . [ Phyllocladus brevior is known only from the female.] Phyllocladus kasantsevi has a broadly emarginate vertex (Figs. 13–15), but it is not distinctly bilobed as is that of P. bilobatus (Figs. 1–2). Moreover, the elytra of P. kasantsevi (Fig. 13) are distinctly ribbed, with the elytral apices acutely rounded; the elytra are not more than inconspicuously costate in P. b i l o b a t u s and the elytral apices are broadly rounded (Fig. 1).