Syneches fuscescens Bezzi

Menezes, Isis Sá & Ale-Rocha, Rosaly, 2016, Revision of the Amazonian species of Syneches Walker (Diptera, Hybotidae, Hybotinae), Zootaxa 4103 (5), pp. 401-442 : 419-420

Syneches fuscescens Bezzi

( Figs 54–58 , 119 )

Syneches fuscescens Bezzi, 1909: 319 . Collin, 1933: 28 (citation); Smith, 1967: 10 (catalog); Rafael & Ale-Rocha, 1995: 535 (revision); Yang et al., 2007: 309 (catalog).

Diagnosis. Large size (about 7.0 mm) with antenna, buccal pieces, thorax, abdomen and legs brown to dark brown. Postpedicel ovate, small, equal to length of scape and pedicel combined. Palpus distinctly bristly. Prosternum narrow. Scutum reasonably high, smaller than the height of mesopleuron; postpronotal lobe and postalar callus yellow; scutellum with yellow margins and five pairs of strong setae intercalated with small setae. Abdomen with long and abundant, yellow lateral setae. Fore femur swollen; mid tibia with AD, PD and P rows of robust setae on apical 2/3; hind femur with some few small but distinct AV setae. Wing sub-hyaline, brownish, with light infuscation from costal region to apex; pterostigma long and slender, brown, not filling up the apex of cell r1; apex of cell r1 narrow.

Description of male. Similar to female, except as follow: scutum with reddish brown pruinescence anteriorly, yellowish-gray pruinescence forming narrow dorsocentral stripe and covering prescutellar disc and scutellum. Pleura completely brown with pale golden pruinescence. Abdomen about 2.5 times length of thorax. Tergite 8 small, 2.2 times wider than long, posterior margin of sclerotized portion shallowly concave medially forming two small lobes, setae long and strong on sides ( Fig. 57 ); sternite 8 trapezoidal with apical long setae ( Fig. 58 ). Terminalia: elongate; hypandrium elongate, narrowed towards apex, with two sclerotized lobes apically, two rows of moderately long setae on central portion of distal half ( Fig. 55 ); epandrial lamella wide, with long strong setae ( Figs 54–56 ); phallus slender, slightly sharpened apically, with small sclerotized lateral protuberance; postgonite broadened basally with slender apical half, shorter than phallus ( Fig. 55 ).

Examined material. BOLIVIA. La Paz; Nor Yungas, btw., Alcoche & Teoponte, 38 km, SW of Guanay, GPS 15°33′33.9″ S 67°44′ 04.5″W, 12.iv.2001, *Restrictions Apply, *USNM—Bolivia CBF, *Agreement 38 ( USMN). ECUADOR. Past. Puyo (25 kmN), 10.vii.1976, Sweeping, J. Cohen (1 ♀, USMN). PERU. Iquitos, iii.27.23, F 606v, H. Basster, Ac. 33591, Syneches fuscescens, Det. Ale-Rocha, 1999 (1 ♂, INPA).

Geographical distribution. Bolivia, Ecuador * and Peru * ( Fig. 119 ).

Comments. This species is similar to S. amazonicus sp. nov. in having the scutum reasonably high, elongate legs, femora slightly dilated and pterostigma elongate, but can be differentiated from it by legs brown to dark brown. The male terminalia of Syneches fuscescens resemble that of S. dichrous , but differs from it by small apical split forming two sclerotized lobes on posterior margin of hypandrium and slender phallus with sharpened apex. The association was made by comparing with female specimens compared with the type.

Figures

FIGURE 119. Geographical distribution of S. curvipes, S. dichrous, S. equatoriensis, S. exilis, S. fuscescens and S. jauensis in Amazon.

FIGURES 54 – 58. Syneches fuscescens Bezzi, 1909. Male terminalia: 54, epandrium, cerci and hypoproct (dorsal view); 55, hypandrium, postgonite and phallus (ventral view); 56, left epandrial lamella (lateral view); 57, tergite 8; 58, sternite 8. Scale = 0.2 mm.