Sennius trinotaticollis (Pic) (Coleoptera: Chrysomelidae: Bruchinae) in Brazil: New Distribution and Host Records

Bruchines (Coleoptera: Chrysomelidae:Bruchinae) are known as seed beetles or bean weevils. Several species of Bruchinae damage seeds of economically important agricultural crops such asGlycine max (L.) (soybean) (Costa et al. 2007), Phaseolus coccineus L. (runner bean), Phaseolus vulgaris L. (common bean), Phaseolus lunatus L. (lima bean) (Hansson et al. 2004; Bonet 2008), Vigna radiata L. (mung bean) (Somta et al. 2008), and Vigna unguiculata (L.) Walp (cowpea) (Aebi et al. 2008). Damage reduces the quantity and quality of the seeds, making them unsuitable for human consumption and agricultural use (Somta et al. 2008). Bruchinae consist of about 1,700 described species distributed in six tribes, nine subtribes, and 67 genera worldwide (Udayagiri and Wadhi 1989; Johnson and Romero 2004; Johnson and Romero 2006). The genus Sennius Bridwell, 1946 encompasses 48 species occurring in the Nearctic and Neotropical regions (Silva et al. 2003). Most of them feed on seeds of Leguminosae subtribe Cassiinae (Johnson 1977, 1984), which includes the genera Senna Mill, Chamaecrista Moench, and Cassia L. (Irwin and Barneby 1981). Although the number of described species of Sennius is relatively high, details about the geographic distribution and hosts of some species occurring in Brazil are scarce. Thus, the aim of this study is to record, for the first time, Sennius trinotaticollis (Pic, 1930) on Senna macranthera (Colladon) Irwin and Barneby and its occurrence in Minas Gerais, Brazil. Seeds of S. macranthera infested by bruchines were collected in Viçosa (20°46′11′′ S, 42°52′31′′ W), Minas Gerais in August 2009 and sent to the Laboratório de Sementes Florestais, Universidade Federal de Viçosa, where they were stored in plastic bags in a dark room at 20° C and 60% RH. Bruchines that emerged from the seeds were collected and stored in 70% alcohol and sent to the Laboratório de Sistemática e Bioecologia de Coleoptera of the Universidade Federal do Paraná for identification by the third author. Two bruchine species were identified as Sennius bondari (Pic, 1929) and S. trinotaticollis. Voucher material is deposited in the Coleção de Entomologia Pe. J. S. Moure, Departamento de Zoologia, Universidade Federal do Paraná, Curitiba, Paraná, Brazil. Sennius species feed mainly on seeds of the genus Senna (Johnson 1984). Sennius bondari is a generalist species and has been found damaging seeds of several Senna species (Ribeiro-Costa 1998; RibeiroCosta and Reynaud 1998), including S. macranthera (Linzmeier et al. 2004). The only known hosts of S. trinotaticollis are Senna hayesiana (Britton and Rose) Irwin andBarneby and Senna oxyphylla (Kunth) Irwin and Barneby in Panama and Guatemala (Johnson 1977, 1984). Sennius trinotaticolliswas just recently found in Brazil (J. H. Viana, unpublished