Gymnochiromyia milleri, Ebejer, 2008

Ebejer, M. J., 2008, New species of Gymnochiromyia Hendel, 1933 (Diptera: Schizophora: Chyromyidae) from Southern Africa, African Invertebrates 49 (1), pp. 77-77 : 98

Gymnochiromyia milleri sp. n.

Figs 17, 18

Etymology: Named after R.M. Miller, who collected this species.

Diagnosis:A yellow species with brown stripes running the length of msn near midline; entirely yellow pleura and ep; scut distinctly broader than long.

Description:

Male.

Head: Shrivelled, yellow with only oc triangle black; fr with about 30 fine white setulae; antenna and first two segments of arista yellow, remainder of arista black; mouthparts yellow, palp cylindrical; gena yellow and although somewhat shrivelled, appears to be less than height of eye; usual 3 orb, 1 vti, 1 vte and shorter pvt; oc as long as posterior orb and about 1.8 length of pvt.

Thorax: msn dull yellow with 2 brown stripes along midline reaching to anterior dc, scut yellow, broad at base about 1.4 its length; mtn and all pleura yellow. Chaetotaxy: 1 long and 1 short hu with setula between them, 1 psthu, 2 ntpl, 1 sa, 1 pa, 1 stpl and 1 mspl with a few setulae in front of each, 0+2 dc, acrs relatively long in 4 irregular rows, prescutellar weak, less than 1/3 length of posterior dc; 1 mspl, 1 stpl.

Wing: Hyaline, veins all pale yellow, distance on costal margin between R 2+3 to R 4+5 is 0.6 that between R 4+5 and M 1+2; distance between crossveins about 0.5 length of apical section of Cu. Haltere yellow.

Legs: Yellow and brownish yellow setulose with no special modifications except slight dilatation of femora.

Abdomen: All yellow with moderately long brown setulae.

Postabdomen: ep all yellow and covered with rather denser than usual brown setulae, with strong anteroventral angle at point of fusion with hyp, cerci small and finely setulose, ph apd narrow, ej apd small but distinct with narrow tubule visible to basiph, prg trapezoidal and finely setulose, psg small, surs with apex curved anteriorly, bac scl distinct, distiphallus broad apically and with pointed lobe.

Female.

As in male except for secondary sexual characters. Postabdomen ( Fig. 18 ) similar to maculiventris , but sclerites of st 8 with setae placed more medially and not on minute tubercles and rostral edge of each sclerite distinctly curved towards dorsum of abdomen.

Length: ♂ 1.5 mm, wing 1.6 mm; ♀1.7 mm, wing 2.0 mm.

Variation: Markings on msn barely discernable in two specimens whereas eight specimens have additional short stripes laterally to middle pair and three specimens have setulae of first costal section longer than thickness of costa.

Holotype: ♂ SOUTH AFRICA: Western Cape: 10 km SE Vanrhynsdorp , along river, Malaise trap, 14.x.1977, R.M. Miller ( NMSA, 1186).

Paratypes: 9♀same data and depository; 2♀same data (NMC).

Figures

Figs 17, 18. G. milleri sp. n.: (17) male hypopygium, lateral view, scale bar = 0.25 mm; (18) female: ventral views of subanal plate (a) and st 8 (b), lateral views of subanal plate (c) and st 8 (d), and spermathecae (e), scale bar = 0.1 mm.