Syneches bilobatus Menezes & Ale-Rocha, 2016

Soares, Matheus M. M., Freitas-Silva, Rafael A. P. & Ale-Rocha, Rosaly, 2021, Review of Brazilian species of Syneches Walker (Diptera, Hybotidae, Hybotinae), with description of ten new species, Zootaxa 5049 (1), pp. 1-84 : 22

Syneches bilobatus Menezes & Ale-Rocha

( Figs 12A–E , 50 )

Syneches bilobatus Menezes & Ale-Rocha, 2016: 411–413 , figs 26–32, 106, 118. Type locality: Manaus , Amazonas, Brazil.

Diagnosis. Small size (1.8 mm) ( Fig. 12A ). Antenna dark brown ( Fig. 12C ). Scutum pyramidal-shaped, broader than mesopleuron in lateral view, covered with reddish brown pruinescence ( Fig. 12B ). Fore and mid tibiae brown to dark brown with yellow base and apex; hind tarsomere 1 brown with base and apex yellow. Wing hyaline; pterostigma inconspicuous; R 2+3 slightly angulate apically; cells br, bm and cua subequally long; second section of M 1 slightly shorter than crossvein r-m ( Fig. 12E ). Apical margin of hypandrium slightly convex and epandrial lamellae with short apical projection.

Type material examined. HOLOTYPE ♂ ( INPA) labelled: “ BRASIL, Amazona s, Manaus, R[eserva Florestal Adolpho ] Ducke , 16–17.iii.1993, Varredura-orla da mata, João Vidal ” “ Holótipo, Syneches bilobatus, Menezes & Ale-Rocha ” [red label] . Holotype condition: left hind leg and right mid tarsus broken off; not dissected.

Distribution. Brazil (Amazonas) ( Fig. 50 ). Syneches bilobatus is known to occurr only from the Amazon biome.

Remarks. Syneches bilobatus is similar to S. pyramidatus given the wing hyaline, pterostigma inconspicuous, scutum pyramidal-shaped, broader than mesopleuron and covered with reddish brown pruinescence. However, the species differs from S. pyramidatus by the brown to dark brown fore and mid tibiae with yellow base and apex (yellow in S. pyramidatus ), hind tarsomere 1 brown with base and apex yellow (yellow in S. pyramidatus ) and second section of M 1 slightly shorter than crossvein r-m (second section of M 1 longer than r-m in S. pyramidatus ). The original description states that there is yellowish-gray pruinescence forming dorsocentral and supra-alar stripes ( Menezes & Ale-Rocha 2016), but we could not distinguish the yellowish-gray stripe in the holotype and paratypes, and now consider that the whole scutum is covered with a reddish brown pruinescence.

Figures

FIGURE 12. Syneches bilobatus Menezes &Ale-Rocha, 2016.A–D. Holotype male.A. Habitus, lateral view; B. Thorax, lateral view; C. Head, lateral view; D. Hind leg, anterior view. E. Paratype (female from Amazonas). Wing.

FIGURE 50. Syneches Walker. Geographical records of S. amazonicus Menezes & Ale-Rocha, 2016; S. applanatus Menezes & Ale-Rocha, 2016; S. bilobatus Menezes & Ale-Rocha, 2016; S. exilis Menezes & Ale-Rocha, 2016; S. jauensis Ale-Rocha & Vieira, 2008 and S. sinclairi sp. nov. in Brazil.