Dichelops ( Prodichelops ) divisus ( Walker, 1867 )

Dichelops ( Prodichelops) divisus ( Walker, 1867)

( Figs. 2 View FIGURES 1 – 2 , 16–21 View FIGURES 16 – 21 )

Diceraeus divisus Walker, 1867: 250 .

Dichelops divisus ; Lethierry & Severin, 1893: 129; Kirkaldy, 1909: 68. Dichelops ( Prodichelops) divisus ; Grazia, 1978: 90–91.

Type: BMNH, HEM. 1056, female, Bates col., deposited at Natural History Museum, London, United Kingdom. Examined .

Type locality. “Amazon Region”; according to label information, the specimen was collected in “St. Paulo” [São Paulo de Olivença, Rio Solimões, Amazonas, Brazil].

Head. Male proportion of antennal segments: I<II=III<IV>V; female proportion of antennal segments: I<II<III<IV<V.

Male genitalia. Pygophore quadrangular ( Fig. 21 View FIGURES 16 – 21 ); genital cup widely open dorsoposteriorly ( Figs. 16–19 View FIGURES 16 – 21 ). Dorsal rim in an open ‘U’, sinuate at base, slightly projected over segment X ( Figs.18–19 View FIGURES 16 – 21 ). Superior processes of dorsal rim spine-like placed before middle of lateral margins of dorsal rim, clearly distant from paramere apices. Posterolateral angles almost truncate not projected posteriorly, with dense and convergent bristle tufts ( Figs. 16–19 View FIGURES 16 – 21 ). Ventral rim bisinuated, at middle in a shallow ‘U’ ( Figs. 16–17, 20–21 View FIGURES 16 – 21 ); inferior layer of ventral rim projecting ventrad in a beaklike structure, well-observed in profile and/or in posterior view of pygophore ( Figs. 16–17 View FIGURES 16 – 21 ). Bristles along ventral rim, especially over folded area inside genital cup, forming 1+1 tuft adjacent to posterolateral angles, 1+1 tuft laterad to ‘U’ concavity, and one tuft at middle of ‘U’ ( Figs. 17, 21 View FIGURES 16 – 21 ). Parameres long and slender, scyte like, laterad directed. Segment X almost pyriform, with 1+1 minute tubercles at middle ( Fig. 19 View FIGURES 16 – 21 ).

Measurements (n=1). Body length 8.96; abdominal width 5.44; head length 1.92, width 2.0; interocular distance 0.96; length of antennal segments: I—0.72, II—0.8, III—0.8, IV—1.12, V—1.6; pronotum length 2.16, width 5.6, width including spines 6.4; scutellum length 3.28, width 3.2.

Female measurements (n=2). Body length 9.32±0.06 (9.28–9.36); abdominal width 5.68±0.11 (5.6–5.76); head length 1.8±0.06 (1.76–1.84), width 2.2±0.06 (2.16–2.24); interocular distance 1.12±0.23 (0.96–1.28); length of antennal segments: I—0.52±0.06 (0.48–0.56), II—0.76±0.06 (0.72–0.8), III—0.92±0.06 (0.88–0.96), IV—1.2, V11.6; pronotum length 1.96±0.06 (1.92–2.0), width 6.2±0.06 (6.16–6.24), width including spines 7.56±0.51 (7.2–7.92); scutellum length 3.8±0.06 (3.76–3.84), width 3.76±0.34 (3.52–4.0).

Material examined. BRAZIL, Amazonas, Estirão da Preta, Rio Liberdade , 11–15.V.2011, D. Takyia col., sweep net ( INPA), 13, 1♀ . COLOMBIA, Amazonas, Prefectura de Tabatinga [ Leticia ], 12.IV.1992, A. Saenz col. ( UFRG), 1♀ .

Comments. The male genitalia of Dichelops ( Prodichelops) divisus are similar to the species of Dichelops ( Dichelops) by the superior process of the dorsal rim as a spine-like structure, and by the parameres’ shape, wide at the base, tapering toward the apex. Dichelops ( Prodichelops) divisus can be distinguished from the other subgenera by the dorsal rim of the pygophore being medially bisinuated, and by the ventral rim of the pygophore being ventrally projected, forming a beaklike structure.

Distribution. Western Amazonia, in Brazil and Colombia, corresponding to Emeri, Varzea and Madeira biogeographic provinces ( sensu Morrone, 2006).