Allorrhina cincta ( Gory and Percheron, 1833 )

Ratcliffe, Brett C., 2015, A Revision of the Neotropical Genus Allorrhina Burmeister, 1842 (Coleoptera: Scarabaeidae: Cetoniinae: Gymnetini), The Coleopterists Bulletin 69 (1), pp. 91-113 : 91-113

Allorrhina cincta ( Gory and Percheron, 1833)

( Figs. 6–8 )

Gymnetis cincta Gory and Percheron 1833: 70 , 339 (original combination).

Holotype male at MNHN, labeled “Ex Musaeo Van Lansberge// type [hand written)//type [printed on red paper]// Museum Paris 1952, Coll. R. Oberthur ”, examined. Type locality: “l’ intérieur du Brésil.”

Gymnetis cincta versicolor Moser 1908: 87 (synonym; described as a variety).

Description. Length 11.3–15.3 mm; width across humeri 6.4–9.0 mm. Head and pygidium (except on cretaceous areas) piceous to black, weakly shiny; pronotum and elytra (except on cretaceous areas) opaque, piceous, dark reddish brown, dark green, or as above but with a longitudinal, diffuse, broad, light reddish brown stripe on center of pronotum and each elytron ( Fig. 6 ). Cretaceous marks as follows: head of males with clypeus chalky either side of occipital horn, frons with round spot mesad of base of each eye, marks of frons and clypeus occasionally merged; females with spot mesad of each eye only; pronotum with slender to usually broad band on each lateral margin, band curving around posterior angle; mesepimeron chalky on posterior half; elytra with slender band on each lateral margin and curving to behind apical umbone; pygidium on each lateral third with broad band. All cretaceous marks may be variably reduced or absent. Venter and legs shiny, black, with cretaceous marks as follows: mesepimeron on posterior half; metepisternum and metepimeron completely chalky; metasternum on anterior and posterior margins (rarely entirely); metacoxa on lateral edge; meso- and metafemora each with slender band on posterior edge on apical half; abdominal ventrite 1 with small spot at center base and on each lateral margin; ventrites 2–5 each with broad, transverse band on posterior margin on lateral thirds, band not reaching midline. All ventral cretaceous marks may be variably reduced or absent, especially in females. Setae of venter and legs tawny. Head: Frons and clypeus of males with large punctures moderately dense to dense either side of occipital keel; clypeus with a small, shallow, round, setigerous depression before apex and end of occipital keel, setae moderately long, tawny; elevated lateral margins strigulose, subparallel, not curving towards base of clypeal horn; clypeal apex with short, subquadrate horn projecting forward and obliquely upwards, apex slightly emarginate or not; occipital horn reduced to a longitudinal keel, apex not free, with short, sparse, tawny setae either side of keel in pristine specimens. Frons and clypeus of females densely punctate, punctures large; clypeal apex broadly subtruncate, weakly reflexed at center; frons weakly, longitudinally tumid at center. Interocular width equals 4.0–4.2 transverse eye diameters. Antenna with 10 antennomeres, club distinctly longer than antennomeres 2–7 in males, only slightly longer in females. Pronotum: Surface opaque, with small, sparse punctures, punctures becoming slightly larger, denser, and crescentshaped on sides and in anterior angles. Lateral margins strongly emarginate between middle and basal angle, with weak marginal bead on basal half. Elytra: Surface opaque, most specimens lacking elevated, parallel costae on disc. Disc and sides with indistinct rows of small punctures, punctures usually obscured. Apices at suture distinctly, angularly produced. Pygidium: Surface of males weakly shiny, with sparse to moderately dense, transverse rugae with minute, tawny setae in pristine specimens; surface on lateral cretaceous areas with rugae smaller, sparser, most specimens with weak, longitudinal keel at center on apical 2/3. Females with small, sparse, glabrous punctures on shiny area, longitudinal keel absent. In lateral view, surface weakly convex in males, nearly flat in females. Venter: Metasternum with moderate size to large, sparse, round to crescent-shaped punctures on lateral thirds, center third nearly impunctate. Mesometasternal process, in lateral view, short, parallel to ventral axis of body; in ventral view, sides parallel, apex broadly rounded. Abdominal ventrites 1–5 of both sexes with small, sparse, oval to crescent-shaped punctures, punctures slightly denser on sternite 6 and slightly denser and larger near lateral margins of all sternites. Legs: Protibia of males slender, bidentate near apex, occasionally with slight swelling suggestive of 3rd tooth below middle. Females with protibia tridentate, broader. Parameres: In caudal view, form short, subrectangular, apices broadly rounded, each with small tooth projecting upwards ( Figs. 7–8 ). Basal piece twice as long as parameres.

Distribution. Allorrhina cincta occurs in southern Brazil, with one uncertain record from northern Argentina.

Locality Records. 84 specimens from AMIC, BCRC, BMNH, CASC, CMNC, CMNH, DEIC, FMNH, INPA, IRSNB, MNHN, MCZC, MZSP, RMNH, QBUM, USNM, ZMHU, and ZSMC. ARGENTINA (1). MISIONES (1): No data. BRAZIL (71). DISTRITO FEDERAL (1): Brasília. GOIÁS (42): Bananeiras, Jatahy (Jataí), Mineiros, Rio Verde, Trinidade , Vianópolis , No data. MATO GROSSO (20): Chapada dos Guimarães, Cuiabá, Rosário Oeste. MATO GROSSO DO SUL (1): Corumbá. MINAS GERAIS (5): Diamantina, Uberaba, Varginha, No data. PARANÁ (2): Barro Prêto, Curitiba. NO DATA (12).

Temporal Distribution. The majority of specimens studied were old and had no date of collection. January (2), May (1), September (1), October (6), November (4), December (1).

Diagnosis. Allorrhina cincta is characterized by its smaller size (less than 15.5 mm), distinctive coloring and presence of cretaceous marks ( Fig. 6 ), pronotum with only small, sparse punctures, and elytra lacking distinctly raised costae on the disc.

Nomenclature. Gymnetis cincta versicolor was described by Moser (1908) for those specimens with a suffusion of red on the center of the pronotum and each elytron. This color variant is commonly seen.

Natural History. There is no information about the natural history of this species. The region in which it occurs is largely tropical savanna.

Figures

Figs. 6–8. Allorrhina cincta. 6) Habitus; 7–8) Parameres.