Therevinae

Holston, Kevin C., 2009, A new species of Acantothereva Séguy, 1935, from Tunisia (Diptera: Therevidae: Therevinae): taxonomic consequences and phylogenetic implications, Zootaxa 2155, pp. 28-36 : 31

Key to Therevinae Genera of North Africa

1 Costal vein ends at CuA2; hind femur with only filiform macrosetae. Three spermathecae, spermathecal sac absent .......................................................................................................................................................................[ Phycinae ]

- vein extends around anal lobe of wing; hind femur with filiform and scalelike (= lanceolate) macrosetae. Two spermathecae, spermathecal sac present........................................................................................................ [ Therevinae ] 2

2 Antennal scape strongly dilated, proboscis elongate and projecting anteriorly ............................................................. ..................................................................................... Chrysanthemyia ([ Spain], Algeria, Morocco, Tunisia; 3 spp.)

- Antennal scape not dilated, proboscis short and extended ventrally ................................................................................. 3

3 Wing membrane opaque grayish white with three transverse bands; distiphallus abruptly tapered on apical half with complex morphology (incl. lateral and posterior sclerotized projections), subcercal region of ventral epandrial scelerite (= hypoproct) extending posteriorly beyond apex of cerci ................................................................................... ............................................................................................ Hoplosathe ( Morocco; H. distincta Lyneborg & Zaitzev )

- Wing membrane transparent to opaque grayish white and maculated without contiguous transverse wing bands; distiphallus base gradually tapered towards apex, subcercal region of ventral epandrial scelerite (= hypoproct) not extending beyond apex of cerci .................................................................................................................................... 4

4 Male eyes separated by more than 3X width of anterior ocellus; female tergite 9 with long curved filiform setae (small species: 6–7 mm) .............................................................................................................................................. 5

- Male eyes touching or separated at most by 1X width of anterior ocellus; female tergite 9 bare (large species: 7–10 mm) .............................................................................................................................................................................. 6

5 Parafacial setae present; female frons covered with uniform tomentum; distiphallus strongly curved, broad and rounded in lateral view .................................................................. Acantothereva ( Algeria, Morocco, Tunisia; 3 spp.)

- Parafacial setae absent; female frons with pair of dark velvety spots; distiphallus weakly sinuate with apex decurved and narrow in lateral view............................................................... Neotherevella ( Egypt, Israel; N. citrina (Becker))

6 Three or more pairs of dorsocentral macrosetae; scutum strongly convex; abdomen with a lateral longitudinal stripe of darker tomentum ............................................................................................ Thereva mirabilis Lyneborg ( Tunisia)

- At most two pairs of dorsocentral macrosetae; scutum flat to weakly convex; abdomen without a lateral longitudinal stripe of darker tomentum ............................................................................................................................................ 7

7 Male tergites with greyish-white to white medial tomentum and setae; female frons with short reclinate setae .......... .............................................................................................. Irwiniella (Canary Islands and Northeast Africa; 4 spp.)

- Male tergites with darker basomedial areas and yellowish grey to black setae; female frons with long semireclinate to erect setae and tomentum often sparse or absent along lower margin with bare areas raised ................................... ....................................................................................... Thereva ([ Spain] Canary Islands to Middle East; ca.10 spp.)