Hyboptera dilutior Oberthuer , 1884

Erwin, Terry L. & Henry, Shasta C., 2017, Hyboptera Chaudoir, 1872 of the Cryptobatida group of subtribe Agrina: A taxonomic revision with notes on their ways of life (Insecta, Coleoptera, Carabidae, Lebiini), ZooKeys 714, pp. 61-127 : 99-105

publication ID	https://dx.doi.org/10.3897/zookeys.714.15113
publication LSID	lsid:zoobank.org:pub:BC4DF927-F547-446C-ACD3-F2B065E0842E
persistent identifier	https://treatment.plazi.org/id/52D698B3-1814-53F4-B674-EBE5D3934F0F
treatment provided by	ZooKeys by Pensoft
scientific name	Hyboptera dilutior Oberthuer , 1884
status

Treatment

Hyboptera dilutior Oberthuer, 1884 Oberthür’s humps-backed beetle Figs 7A View Figure 7 , 10B View Figure 10 , 11 View Figure 11

Hyboptera dilutior Oberthür, 1884: 52.

Holotype.

Sex unknown. Brazil. Amazonas: Tefé (MNHP).

Derivation of specific epithet.

The specific epithet, dilutior , is an adjective referring to the "washed out" appearance of the color of adults of this species in comparison with those of other species.

Proposed English vernacular name.

Oberthür’s humps-backed beetle.

Diagnosis.

With the attributes of the genus and tuberculata species group as described above and adults with only dark non-metallic markings on the head and pronotal disc, pronotum with discal rugae in basal half etched at an angle aimed medio-posteriorly, or somewhat chaotically. Elytra mostly testaceous with darkly marked tubercles; small medio-apical tubercles also infuscated; with sutural margin at apical sixth infuscated markedly contrasting with testaceous background color. Venter of head and thorax substantially infuscated; abdominal sterna mostly pale with subtle infuscation.

Description.

(Figs 7A View Figure 7 , 10B View Figure 10 ). Size: See Appendix 1. Length (SBL) long for genus, ABL = 3.92-5.98 mm, SBL = 3.55-4.67 mm, TW = 1.95-3.21 mm.

Color: See diagnosis, above.

Luster: Without any metallic highlights, shiny.

Microsculpture: Mostly isodiametric and stretched, shallowly impressed, cells somewhat more stretched around elytral tubercles.

Head: Rugae moderately coarse, mostly without patterned arrangement. Eye moderately large, hemispheric, evenly rounded. Antenna short, barely reaching humerus. Labrum rectangulate, shallowly bilobed, anterior margin slightly emarginate. Neck finely transversely rugose.

Prothorax: Pronotum markedly broad, disc centrally markedly depressed with coarse angulate rugae. Lateral margins broadly explanate and evenly rounded to obtuse hind angle, base medially produced and rounded posteriorly.

Pterothorax: Normal for Agrina , fully winged. Elytron intervals 3 and 5 each with 7 promient discal unisetiferous tubercles, other intervals moderately convex, side margin broadly explanate laterally only at middle third. Elytron broad and short, much narrower in width to that of the pronotum at the broadest part, apex truncate, slightly rounded with distal corner broadly and obtusely rounded, disc not significantly convex, basal third slightly depressed. All interneurs well-impressed.

Legs: Femur dorso-ventrally moderately depressed, tibia coequal in length, more depressed; tarsus less than half the length of the tibia, fourth tarsomere markedly bilobed and with tarsal pad of setae.

Abdomen: Sparsely setiferous; normal ambulatory setae on sterna 3-5; female with two pairs of ambulatory setae on sternum 6, medial pair of setae less than the length of lateral pair; males with only the lateral pair of longer setae.

Male genitalia: Phallus (Fig. 10B View Figure 10 ) with ostium of 1/6 its length, catopic, apex very short, narrowly pointed, broadly rounded in dorsal aspect; endophallus with flagellum (obvious in illustration), flagellum not barbed. Parameres asymmetric, right very small, left larger.

Female genitalia: Not investigated, likely similar to that of H. lucida (Fig. 8 View Figure 8 ).

Dispersal potential.

These beetles are macropterous and capable of flight. They are moderately swift and agile runners. Adults of this species are attracted to C.D.C. light traps and captured in SLAM Malaise traps.

Way of life.

Adults are common in the lowlands (7 to 356 m a.s.l.) and appear to be generalists in a variety of rainforest biotopes including terra firme and várzea. In these forests, they are commonly found in big trees with vines and epiphytes, in suspended dry leaves, in dry Sheelea sp. and Astrocaryum chambira Burret palm frond skirts. Individuals can be found from January to December, in both the rainy and dry seasons. Member of this species have been recorded from the canopy of the following tree species using insecticidal fogging techniques: Chrysophyllum argenteum cf.; Sterculia colombiana cf.; Parkia multijuga cf.; Naucleopsis herrerensis cf.; Matisia malacocalyx cf.; Pseudolmedia laevigata ; Cecropia herthae ; Pentagonia spathicalyx cf.; Eschweilera coriacea cf.; Batocarpus orinocensis cf.; Zanthoxylum riedelianum ssp. kellermanii cf.; Cecropia ficifolia ; Inga capitata ; Leonia glycicarpa ; Coussapoa herthae ; Pourouma mollis ssp. triloba cf.; Pausandra trianae ; Coussapoa orthoneura cf.; Alchornea triplinervia cf.; Protium sagotianum cf.; Guatteria sp.; Meiocarpus , long petiole; Oenocarpus bataua ; Neea dive-tuberculate; Semaphyllanthe megistocaula cf.; Lauraceae redvein; Siparuna decipiens ; Trichilia solitudinis .

Other specimens examined.

Brazil, Amazonas, Parana do Xiboreninho, 3.2482°S, 59.9791°W, 7m, 7 August 1979 (TL Erwin, J Adis, et al.)(NMNH: ADP006180, female), 40 km SW Manaus, Paraña Costa da Ilha de Curarí, 3.4165°S, 60.2508°W, 17m, 3 August 1979 (TL Erwin, J Adis)(NMNH: ADP005799, male), north of Manaus, on Amazonas 010 at Km 26, Reserva Ducke, 2.918°S, 59.971°W, 70m, 2 May 1978 (J Arias)(NMNH: ADP135826, female), 11 May 1978 (J Arias)(NMNH: ADP135786, male), 1 August 1978 (J Arias)(NMNH: ADP135804, female), 6 September 1978 (J Arias)(NMNH: ADP135792, male), 13 September 1978 (J Arias)(NMNH: ADP135790, ADP135818, females), 20 September 1978 (J Arias)(NMNH: ADP135778, male); Pará, Belém, 1.555°S, 48.429°W, 25m, 25 January 1969 (L O’Brien, CW O’Brien)(NMNH: ADP006178, female), Parque Estadual do Utinga, Belém, 1.406°S, 48.399°W, 21m, 20 January 1977 (N Guimaraes)(NMNH: ADP006179, female); Rondonia, 7 km E Costa Marques, 1 2.435°S, 64.292°W, 153m, 11-23 April 1987 (T Klein)(NMNH: ADP135883, female). Ecuador, Orellana, Reserva Ethnica Huaorani, 39 km S, Pompeya, Estación Científica Yasuní - Onkone Gare Camp, Erwin Piraña Plot: transect 4, station 7, 0.6570°S, 76.4498°W, 220-250m, 16 January 1994 (TL Erwin, et al.)(NMNH: ADP137700, female), Erwin Piraña Plot: transect 5, station 7, 0.6566°S, 76.4490°W, 220-250m, 26 January 1994 (TL Erwin, et al.)(NMNH: ADP135940, male), Erwin Piraña Plot: transect 10, station 10, 0.6540°S, 76.4453°W, 220-250m, 8 February 1995 (TL Erwin, et al.)(NMNH: ADP006175, male), Erwin Piraña Plot: transect 8, station 5, 0.6551°S, 76.4403°W, 220-250m, 30 June 1995 (TL Erwin, et al.)(NMNH: ADP137756, male), Erwin Piraña Plot: transect 1, station 4, 0.6586°S, 76.4521°W, 220-250m, 4 February 1996 (TL Erwin, et al.)(NMNH: ADP137692, female), Erwin Piraña Plot: transect 5, station 7, 0.6566°S, 76.4490°W, 220-250m, 9 February 1996 (TL Erwin, et al.)(NMNH: ADP135974, male), Erwin Piraña Plot: transect 2, station 7, 0.6581°S, 76.4513°W, 220-250m, 30 September 1996 (TL Erwin, et al.)(NMNH: ADP137698, male), Erwin Piraña Plot: transect 6, station 2, 0.6561°S, 76.4483°W, 220-250m, 2 October 1996 (TL Erwin, et al.)(NMNH: ADP135926, female), Erwin Piraña Plot: transect 8, station 5, 0.6551°S, 76.4403°W, 220-250m, 3 October 1996 (TL Erwin, et al.)(NMNH: ADP135930, male), Erwin Piraña Plot: transect 9, station 8, 0.6545°S, 76.4460°W, 220-250m, 4 October 1996 (TL Erwin, et al.)(NMNH: ADP137387, ADP137690, males), Erwin Piraña Plot: transect 3, station 7, 0.6575°S, 76.4505°W, 220-250m, 21 January 2006 (TL Erwin, et al.)(NMNH: ADP133846, male), Yasuni National Park (edge), 95.43 km E (heading 101.46°) Coca, Tiputini Biodiversity Station, Erwin Harpia Plot: transect 10, station 2, 0.6262°S, 76.1443°W, 214m, 5 Febru ary 1999 (TL Erwin, et al.)(NMNH: ADP135832, female), Orellana, Yasuni National Park (edge), 95.43 km E (heading 101.46°) Coca, Tiputini Biodiversity Station, Erwin Harpia Plot: transect 3, station 9, 0.6332°S, 76.1443°W, 207m, 30 June 1998 (TL Erwin, et al.)(NMNH: ADP135782, female), Erwin Harpia Plot: transect 10, station 8, 0.6262°S, 76.1443°W, 214m, 21 October 1998 (TL Erwin, et al.)(NMNH: ADP135836, male), Erwin Harpia Plot: transect 10, station 3, 0.6262°S, 76.1443°W, 214m, 5 February 1999 (TL Erwin, et al.)(NMNH: ADP135784, female), Erwin Harpia Plot: transect 6, station 5, 0.6295°S, 76.1443°W, 199m, 7 February 1999 (TL Erwin, et al.)(NMNH: ADP135840, male, ADP135806, female), Erwin Harpia Plot: transect 5, station 6, 0.6332°S, 76.1443°W, 207m, 8 February 1999 (TL Erwin, et al.)(NMNH: ADP135794, female), Erwin Harpia Plot: transect 10, station 4, 0.6262°S, 76.1443°W, 214m, 28 September 2000 (TL Erwin, et al.)(NMNH: ADP139140, male), Erwin Harpia Plot: transect 6, station 1, 0.6304°S, 76.1443°W, 199m, 1 October 2000 (TL Erwin, et al.)(NMNH: ADP139128, ADP139134, ADP139150, males), Erwin Harpia Plot: transect 1, station 3, 0.6342°S, 76.1443°W, 214m, 2 October 2000 (TL Erwin, et al.)(NMNH: ADP139124, male), Erwin Harpia Plot: transect 10, station 5, 0.6262°S, 76.1443°W, 214m, 17 February 2001 (TL Erwin, et al.)(NMNH: ADP139112, male), Erwin Harpia Plot: transect 3, station 1, 0.6332°S, 76.1443°W, 207m, 24 July 2001 (TL Erwin, et al.)(NMNH: ADP139527, female); Sucumbíos, Río Napo, Sacha Lodge, Pilchicocha, 0.472°S, 76.459°W, 228m, 22 February - 4 March 1994 (P Hibbs)(SEMC: ADP006174, male), 14-24 March 1994 (P Hibbs)(SEMC: ADP006173, female), 13-23 April 1994 (P Hibbs)(SEMC: ADP006132, female), 24 March - 3 June 1994 (P Hibbs)(SEMC: ADP007645, female). French Guiana, Cayenne, Foret de Maya, Commune Macouria, 4.9535°S, 52.4566°W, 32m, 19 December 2016 (S Brule, PH Dalens, E Poirier)(NMNH: ADP148976, male, Mitaraka, Commune Maripasoula, 2.2723°S, 54.5152°W, 445m, 4 March 2016 (S Brule, PH Dalens, E Poirier)(NMNH: ADP148975, female), Commune de Roura, Montagne des Chevaux, 4.7127°N, 52.3966°W, 90m, 19 June 2010 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135774, male, ADP135788, female), 2 January 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP130786, female), 28 March 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135814, male), 14 August 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135802, female), 21 August 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135820, female), 11 September 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135776, ADP135824, females), 25 September 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135770, female), 8 October 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135816, female), 23 October 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP140522, male, ADP135772, female), 30 October 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135796, female), 12 November 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135780, female), 11 December 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135830, female), 18 December 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135800, ADP135810, females), 21 December 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135768, ADP135808, females), 24 December 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP 135798, female), 18 February 2012 (S Brule, PH Dalens, E Poirier)(NMNH: ADP128634, female), 3 November 2012 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135828, male), 3 January 2013 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135822, male), 27 January 2013 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135811, male), 31 March 2013 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135812, female), 20 April 2013 (S Brule, PH Dalens, E Poirier)(NMNH: ADP148093, male), 12 April 2014 (S Brule, PH Dalens, E Poirier)(NMNH: ADP140520, male), 19 July 2014 (S Brule, PH Dalens, E Poirier)(NMNH: ADP140531, male), 27 December 2014 (S Brule, PH Dalens, E Poirier)(NMNH: ADP148092, male), 3 January 2015 (S Brule, PH Dalens, E Poirier)(NMNH: ADP148091, male), 17 October 2015 (S Brule, PH Dalens, E Poirier)(NMNH: ADP148094, male), 2 January 2016 (S Brule, PH Dalens, E Poirier)(NMNH: ADP148095, ADP148096, ADP148097, males), 9 January 2016 (S Brule, PH Dalens, E Poirier)(NMNH: ADP148102, male), 30 April 2016 (S Brule, PH Dalens, E Poirier)(NMNH: ADP148871, male), Commune Matoury, Mont Grand, 4.862°N, 52.355°W, 215m, 17 December 2012 (S Brule, PH Dalens, E Poirier)(NMNH: ADP135801, female), Inselberg, Nouragues, Commune de Regina, Saut Parare, 4.0334°N, 52.6786°W, 51m, 13 October 2010 (S Brule, PH Dalens, E Poirier)(NMNH: ADP128636, female), Camp Inselberg, Nouragues, Commune de Regina, 4.0839°N, 52.6813°W, 411m, 22 November 2012 (S Brule, PH Dalens, E Poirier)(NMNH: ADP147735, female), Region de Saul, Commune de Saul, Belvedere de Saul (point de vue), 3.6223°N, 53.2159°W, 283-325m, 5 February 2010 (S Brule, PH Dalens, E Poirier)(NMNH: ADP130781, female), 5 February 2010 (S Brule, PH Dalens, E Poirier)(NMNH: ADP130782, female), 20 December 2010 (S Brule, PH Dalens, E Poirier)(NMNH: ADP130784, female), 24 January 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP130783, female), 4 February 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP134146, female), 7 February 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP130785, ADP134155, females), 22 March 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP134142, ADP134150, males, ADP134148, ADP134149, females), 30 March 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP134147, male), 15 June 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP134296, female), 11 August 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP134154, female), 13 December 2011 (S Brule, PH Dalens, E Poirier)(NMNH: ADP134144, female), 3 October 2012 (S Brule, PH Dalens, E Poirier)(NMNH: ADP134298, male), 11 December 2012 (S Brule, PH Dalens, E Poirier)(NMNH: ADP134153, male, ADP134151, ADP134152, females), 16 January 2013 (S Brule, PH Dalens, E Poirier)(NMNH: ADP134145, female), 27 January 2013 (S Brule, PH Dalens, E Poirier)(NMNH: ADP147733, female), Foret de Maya, Commune Macouria, 4.9552°N, 52.4603°W, 30m, 19 December 2016 (S Brule, PH Dalens, E Poirier)(NMNH: ADP151236, male). Perú, Loreto, Pacaya-Samiria National Reserve, Río Samiria, Cocha Shinguito, 5.1775°S, 76.6556°W, 112m, 29 August 1991 (TL Erwin, MG Pogue)(NMNH: ADP051385, ADP051413, males, ADP051412, ADP051415, females), 19 June 1990 (TL Erwin, et al.)(NMNH: ADP094114, ADP094121, males, ADP094067, female), Río Samiria (South Branch), Camp Terry, 5.6951°S, 75.2243°W, 129m, 14 May 1990 (TL Erwin, et al.)(NMNH: ADP007644, female), 16 May 1990 (TL Erwin)(NMNH: ADP094121, ADP094084, females); Madre de Dios, Manu Reserved Zone, Río Manu, BIOLAT Biological Station, Pakitza, 11.9446°S, 71.2831°W, 356m, 14 October 1991 (TL Erwin, MG Pogue)(NMNH: ADP007512, ADP007513, females), 16 October 1991 (TL Erwin, MG Pogue)(NMNH: ADP007530, female), 23 June 1993 (TL Erwin, F. Pfuno)(NMNH: ADP007531, male, ADP007529, ADP007551, females), 28 September 1991 (TL Erwin, MG Pogue)(NMNH: ADP007528, female), 6 October 1991 (TL Erwin, MG Pogue)(NMNH: ADP007511, female), Reserva Nacional Tambopata, 30 km (air) SW Puerto Maldonado, Explorer’s Inn, 12.8364°S, 69.2936°W, 209m, 16 March 1982 (TL Erwin, et al.)(NMNH: ADP007642, male), 3 October - 15 November 1983, NE Stork, et al.)(NMNH: ADP135873, female), 2 March 1984 (TL Erwin, et al.)(NMNH: ADP007643, male), 8 September 1984 (TL Erwin, et al.)(NMNH: ADP007641, female). Venezuela, Amazonas, Cerro de la Neblina, Rio Baria Basecamp, 0.837°N, 66.162°W, 138m, 10-20 February 1985 (PJ Spangler, PM Spangler, et al.)(NMNH: ADP006177, female), 20 February 1985 (PJ Spangler, PM Spangler, et al.)(NMNH: ADP006176, female), 21-28 February 1985 (PJ Spangler, PM Spangler, et al.)(NMNH: ADP005803, male).

Geographic distribution

(Fig. 11 View Figure 11 ). This species is currently known from the type locality at Tefé, Brazil, and from Brazil - Amazonas, Pará, Rondonia; Ecuador, French Guiana, Perú, and Venezuela.

Notes.

Reichardt (1973) reported the following additional specimens that we did not see: Brazil - Amazonas: Itaituba (3 exs. MNHP); Manaus (1 ex. MZSP); Matuxadi, alto Rio Cauaburi (1 ex. MZSP): Tefé (4 exs. MNHP). Pará: Tapajos (2 exs. MNHP). Lorenz (1998, 2005) failed to record this species.