Syneches

Menezes, Isis Sá & Ale-Rocha, Rosaly, 2016, Revision of the Amazonian species of Syneches Walker (Diptera, Hybotidae, Hybotinae), Zootaxa 4103 (5), pp. 401-442 : 438-440

Syneches sp. 2

( Figs 101–102, 117 , 123 )

Diagnosis. Antenna brown except apex and base of postpedicel light brown; palpus light brown. Scutum high, rounded, dark brown except light brown postalar callus, with rough and dense reddish brown pruinescence; pleura brown except lower portion of anepimeron light brown. Legs brown except fore and mid femora paler apically; fore tibia, apical 2/3 of mid tibia and tarsomeres 1–4 light brown; fore tibia, hind femur and tarsomere 1 enlarged. Wing hyaline, with tenuous and elongate pterostigma filling up the apex of cell r1.

Description. ♀. Body: 3.5 mm. Wing: 3.0 mm. Head. Eyes with lower facets larger around buccal opening. Ocellar triangle protuberant, with coarse golden pruinescence. Face brown with dense and gray pruinescence. Antenna with golden short setulae; scape and pedicel brown; pedicel with brown marginal setae, reaching halflength of postpedicel; postpedicel small, longer than length of scape and pedicel combined, ovate, about 1.4 times longer than wide, brown with apex and base lighter, 1 median seta longer than length of postpedicel; stylus about 2.5 times length of antenna, with short setulae and bare on distal 1/3. Postcranium with coarse golden pruinescence. Proboscis light brown, slightly darker basally; palpus light brown, with short golden and dense setulae, small, about 1/3 length of proboscis, with 1 apical, 1 preapical dorsal and 1 medial ventral, long seta. Thorax. Prosternum narrow. Pronotum dark brown, with brown, sparse and elongate marginal setae. Scutum high, rounded, same height as mesopleuron; dark brown except light brown postalar callus, subshiny with dense and rough reddish brown pruinescence; setae brown, short, longer on prescutellar disc; 4 series of acrostichal setae and 1 dorsocentral series. Pleura brown with lower portion of anepimeron light brown, bearing golden pruinescence. Chaetotaxy: 1 dc and 2 acr long and slender on prescutellar disc; 2 long and robust npl; 1 pal; scutellum with long setae, 1 subapical with parallel, long and robust setae, 1 weak apical pair, about 2/3 length of subapical pair, and 5 lateral setae, as long and strong as apical pair. Legs. Fore femur and tibia slightly enlarged at basal half, hind femur and tarsomere 1 enlarged. Brown, except apex of fore and mid femora, fore tibia, apical 2/3 of mid tibia and tarsomeres 1–4 light brown. Fore tibia with long D and PV setae. Tarsomere 1 with PV row of long setae. Mid femur with AV and PV rows of longer and stronger setae at basal half. Mid tibia with 1 AD and 1 AV before middle; AD surface with one seta after middle and one shorter preapical seta; 1 apical PV; 1 apical V longer than tarsomere 1; 1 A and 1 apical AV, all yellow. Mid tarsomere 1 with stronger V and PV setae. Hind femur with 11 robust setae distributed on AV and V surfaces, most apical setae shorter, almost spine-like and inserted on small tubercles. Hind tibia with 1 PD, 1 AD preapical and 1 apical AV seta. Hind tarsomere 1 with 3 A setae. Wing ( Fig. 117 ). Hyaline, with tenuous, almost inconspicuous elongate pterostigma, filling up apex of cell r1. Abdomen. About 2.5 times length of thorax. Brown, subshiny, with reddish brown pruinescence; brown setae, longer on sides. Terminalia ( Figs 101, 102): elongate; sternite 8 long, narrowed on basal 1/2, with small medial concavity on apex, with short setae, central portion unsclerotized at basal 1/ 2; tergite 8 two times longer than wide; cercus long and slender, 3/4 length of tergite 10. Male. Unknown.

Examined material. BRASIL. Amazonas, Manaus, PDBFF, WWF, Proj[eto] Bert Klein, iv.1985, Malaise, Reserva 1210, 4♀; idem, x.1984, Reserva 1112, 3 ♀; idem, vii.1985, Reserva 1112, 1 ♀; idem, 15.i.1986, Reserva 1301, 1 ♀; idem, iv.1985, Reserva 1301, 3 ♀; idem, i.1985, Reserva 1112, 1 ♀; idem, 18.ix.1985, Reserva 1301, 1 ♀; idem, v.1986, Reserva 1301, 1 ♀; idem, iv.1985, Reserva 1208, 1 ♀; idem, iv.1986, Reserva 1301, 2 ♀ (all deposited in INPA).

Geographical distribution. Brazil (Amazonas) ( Fig. 123 ).

Observation. The description of the scutellar setae was completed by looking at the paratypes.

Comments. This new species is similar to S. luteus ( Wiedemann, 1830) in having scutum high and rounded, brown, robust setae on hind femur and hyaline wing lacking colored pterostigma. It can be differentiated from S. luteus by more slender hind femur; legs brown with apex of fore and mid femora, fore tibia, apical 2/3 of mid tibia and tarsomeres 1–4 light brown; hind femur bearing about 11 robust setae distributed on AV and V surfaces. In S. luteus the fore and hind femora are enlarged, the legs are brown and the hind femur with reduced number of setae (2 AV and 3 V). The type of Syneches luteus , from SNG, was studied during the development of this work but so far this species was not registered in the Amazon.

Figures

FIGURE 123. Geographical distribution of S. tenebricus, S. vidali, S. walkeri, S. sp. 1 and S. sp. 2 in Amazon.

FIGURES 103 – 117. Wings of Amazonian species of Syneches: 103, S. amazonicus sp. nov.; 104, S. angulatus sp. nov.; 105, S. applanatus sp. nov.; 106, S. bilobatus sp. nov.; 107, S. curvipes; 108, S. equatoriensis sp. nov.; 109, S. exilis sp. nov.; 110, S. maculosum sp. nov.; 111, S. manaos; 112, S. moraballi; 113, S. striatus sp. nov.; 114, S. tenebricus sp. nov.; 115, S. walkeri; 116, S. sp. 1; 117, S. sp. 2. Scale = 0.5 mm.