Agroecus griseus Dallas, 1851

Barros, Lurdiana D., Paim, Marcelo R., Krein, Verônica, Carabajal, Victor, Brandão, Marcela N., Bernardes, Paula De O. & Lindner, Mariana F., 2021, Illustrated guide to Pentatominae (Hemiptera: Pentatomidae) species associated with the four main grain crops in Rio Grande do Sul state, Brazil, Zootaxa 4958 (1), pp. 430-478 : 438-439

Agroecus griseus Dallas, 1851

( Figs 16–19 )

Agroecus griseus Dallas, 1851: 199 ; Walker, 1867: 243; Stål, 1872b: 23; Distant, 1880: 329; Lethierry & Severin, 1893: 126; Kirkaldy, 1909: 63; Jensen-Haarup, 1937: 171; Buckup, 1957: 8; Buckup, 1961: 9; Rider & Rolston, 1987: 437–438.

Agroecus tenebricosus Buckup, 1957: 8 .

Material studied. Barra do Ribeiro: 1♂, Boa Vista farm, 30°27’25.4”S 51°16’23.8”W, 16.XII.2003, Probio Team leg. ( MCNZ) . Itaúba : 1♀, 06.IV.1978, H. Bischoff leg. ( MCNZ) ; 1♂, 1♀, 18.IV.1978, M. H. Galileo leg. ( MCNZ) ; 1♂, 1♀, 06.IV.1978, E. H. Buckup leg. ( MCNZ) ; 2♀, 06.IX.1978, E. H. Buckup leg. ( MCNZ) . Palmares do Sul : 1♀, 1♂, Capivari Lake isthmus, 30°15’08.2”S 50°32’01.1”W, 20.V.2004, Probio Team leg. ( MCNZ) . Porto Alegre: 1♂, Agronomia , 24.X.1985, Fernandes leg. ( UFRG) ; 1♂, Vila Assunção, 21.IV.1985, A. Mohr leg. ( UFRG) ; 1♂, 26.XI.1991, J. A. M. Fernandes leg. ( UFRG) ; 1♀, 24.IX.1952 ( MCNZ) ; 1♀, 23.IX.1952 ( MCNZ) ; 1♀, 09.V.1951 ( MCNZ) ; 1♀, 23.XII.1952 ( MCNZ) ; 1♀, 08.IX.1948 ( MCNZ) ; 1♀, 18.II.1953 ( MCNZ) ; 1♂, 13.V.1953 ( MCNZ) ; 1♂, 03.X.1951 ( MCNZ) , 1♂, 18.VIII.1954 ( MCNZ) ; 1♂, 24.X.1956 ( MCNZ) ; 1♂, 27.VI.1953 ( MCNZ) ; 1♂, 20.IX.1954 ( MCNZ) ; 1♂, 05.X.1949 ( MCNZ) . São Leopoldo: 1♀, ( MCNZ) . Triunfo : 1♂, Parque Braskem , main trail, 16.IX.2009, A. Barcellos & D. Casagrande leg. ( MCNZ) ; 1♂, Parque Copesul, Mirante do Umbu trail, 29.IV.2003, ( MCNZ) ; 1♂, Parque Copesul , portico trail, 29.IV.2003, ( MCNZ) ; 1♂, Parque Copesul , 19.XI.2002, ( MCNZ) . Tupandi : 1♀, V.2009, R. V. Dalbem leg. ( UFRG) .

Diagnostic features. Body grayish. Head wider than long; mandibular plates and clypeus subequal in length. Anterolateral margins of pronotum straight or sub rectilinear and crenulated ( Rider & Rolston 1987); humeral angles weakly produced and obtuse; trans-humeral band with callosities but without punctures ( Fig. 16 ). Scutellum with a prominent Y-shaped tubercle ( Fig. 16 ). Corium bands without punctures ( Fig. 17 , red arrow) and minute teeth on lateral margins ( Fig. 17 ). All femora with two rows of small tubercles bearing setae ( Fig. 18 ). Body length: 7.00– 8.50 mm.

Recorded host plants. Maize ( Gassen 1996; Fávaro et al. 2012).

Distribution in Rio Grande do Sul. Barra do Ribeiro, Itaúba, Palmares do Sul, Porto Alegre, Santa Maria, São Leopoldo, Triunfo and Tupandi ( Fig. 19 ).

New records. Barra do Ribeiro, Itaúba, Palmares do Sul, Porto Alegre, São Leopoldo, Triunfo and Tupandi.

Comments. This species feeds at the base of plants, affecting tissue formation during growth ( Gassen 1996).

Figures

FIGURES 16–19. Agroecus griseus. 16: Dorsal view, scale bar = 1.0 mm. 17: Corium, with unpunctured bands. 18: Fore and mid femora bearing small tubercles. 19: Distribution within Rio Grande do Sul.