Cyclocephala acoma Ratcliffe, 2008

Ratcliffe, Brett C., 1821, More New Species ofCyclocephalaDejean, 1821 from South America (Scarabaeidae: Dynastinae: Cyclocephalini), The Coleopterists Bulletin 62 (2), pp. 221-241 : 221-241

Cyclocephala acoma Ratcliffe , new species

( Figs. 1–4 )

Type Material. Holotype male, labeled ‘‘ BOLIVIA; Santa Cruz, Amboro National Park, Los Volcanes , c. 1,000 m, S18 ° 06 9;W63 ° 36 9, 20/xi-12/xii-2004 // MV light sheet, on stream beach, Barclay, M. V.L. & Mendel, H., BMNH (E) 2004- 280,’’ and my red holotype label . Allotype female with same data and my red allotype label. Four males and two females with same data and my yellow paratype labels. Two males and three females labeled ‘‘ BOLIVIA: Dep. Santa Cruz, Bermejo , Refugio Los Volcanes , Stream next to Research Station , 18 ° 06 9 41 (sic) S63 ° 36 9 05 0 W, 22.xi.2003, @ blue light trap, coll. D.J.Mann & A.C.Hamel // OUMNH-2004-005, D.J.Mann & A.C.Hamel coll., Pres. Mann & Hamel, 2004,’’ and with my yellow paratype labels. Three males and three females with same data except date of 22-xi-2003. One male and one female labeled ‘‘ BOLIVIA: Dep. Santa Cruz, Bermejo, Refugio Los Volcanes, Humid Forest , 1,080 alt, 18 ° 06 9 S 63 ° 36 9 0 (sic) W, 24.xi.2003, @ blue light along forest path, coll. D.J.Mann & A.C.Hamel //OUMNH-2004-005, D.J.Mann & C.Hamel coll., Pres. Mann & Hamel, 2004,’’ and with my yellow paratype labels. Two additional male paratypes with same data but with date of 22-xi-2003 and 26-xi-2003, respectively .

Holotype, allotype, and two paratypes deposited at the Natural History Museum ( BMNH), London, United Kingdom . Two paratypes at the University of Nebraska State Museum, Lincoln, NE ; seven paratypes at the Museo de Historia Natural (Colección Boliviana de Fauna), La Paz, Bolivia ; four paratypes at the Oxford University Museum of Natural History , Oxford, United Kingdom ; two paratypes at the U.S. National Museum , Washington, D. C.; and four paratypes in the B. C. Ratcliffe Collection, Lincoln, NE.

Holotype. Male. Length 13.8 mm; width across humeri 6.9 mm. Color of dorsum pale testaceous except for small, round, black spot near lateral margin of pronotum, scutellar and sutural margins narrowly brown, and pygidium and venter reddish brown; tarsi and apices of femora black. Head: Surface glabrous. Occiput sparsely punctate, punctures small. Frons densely punctate, becoming rugulopunctate towards frontoclypeal suture, punctures small and minute mixed. Frontoclypeal suture distinct, arcuate. Clypeus with surface entirely rugulopunctate; apex evenly rounded into a semicircle, reflexed slightly higher than sides. Interocular width equals 3.0 transverse eye diameters. Antenna with 10 segments, club 3-segmented and subequal in length to segments 2–7. Pronotum: Surface glabrous, moderately densely punctate, punctures small. Base with complete marginal bead. Posterior angles broadly rounded. Elytra: Surface glabrous, finely shagreened, densely punctate; punctures moderately large, shallow, some in rows (striae). Pygidium: Surface (except apex) opaque, coarsely roughened, setigerous; setae dense, moderately long, reddish brown. Apex shining, densely rugulopunctate, punctures small, setae absent. In lateral view, surface weakly convex in basal half, strongly convex in apical half. Legs: Protibia bidentate and with swelling where third, basal tooth would have been. Protarsus ( Fig. 4 ) strongly enlarged; tarsomeres 2–4 each slightly larger than preceding; 5th longer than tarsomeres 1–4, arcuate, carinate on medioventral edge, venter with row of stout, black bristles. Median claw enlarged (about 3 times thickness of smaller claw), strongly curved, apex entire. Metatarsus slightly longer than twice length of metafemur. Meso- and metatarsal claws long, slender, more than half length of tarsomere 5. Venter: Prosternal process very short, subtriangular. Metasternum glabrous. Parameres: Figs. 2–3 .

Allotype. Female. Length 14.6 mm; width across humeri 7.7 mm. As holotype except in the following respects: Elytra: Epipleuron (ventral view) broad for its entire length, abruptly terminating in a right angle at level of sternite 5. In dorsal view, lateral margin slightly swollen laterad of apical umbone, swelling black. Pygidium: Surface densely, finely rugulopunctate, glabrous. In lateral view, surface weakly convex. Legs: Protibia tridentate, teeth subequally spaced. Protarsus normal, not enlarged. Metatarsus only slightly longer than metatibia.

Variation. Males (12 paratypes). Length 13.2–15.5 mm; width across humeri 6.8–7.4 mm. The paratypes do not differ significantly from the holotype, except that the sutural line varies from brown to piceous to black.

224 Females (9 paratypes). Length 13.8–14.3 mm; width across humeri 6.9– 7.5 mm. The paratypes do not differ significantly from the allotype, except that the color of the subapical swelling of the elytra and the sutural line varies from brown to piceous to black

Etymology. This species is remarkably glabrous, or without setae. Accordingly, I have named it acoma from the Greek akomos, meaning bald or without hair.

Distribution. Cyclocephala acoma is known only from the type locality at the Los Volcanes Research Station in Parque Nacional Amboro in the province of Santa Cruz on the eastern slopes of the Andes.

Diagnosis. Cyclocephala acoma will key only to couplet 173 in the male key in Endrödi (1985), where the key no longer fits any of the characters. The asymmetrical male parameres are unique among Cyclocephala species. Only the parameres of C. cartwrighti Endrödi , also from Bolivia, approach those of C. acoma , but C. cartwrighti is setose on the head and pronotum and has more black markings on both the head and pronotum. The male parameres of both species are also different.

Figures

Figs. 1–4. Cyclocephala acoma: 1) dorsal view of paratype; 2–3) parameres (caudal and lateral views); 4) right protarsus, median view.