Afroholopogon vumba ( Oldroyd, 1974 )

Londt, Jason G. H., 2005, A review of afrotropical Afroholopogon Londt, 1994 with the description of a new genus and new species (Diptera: Asilidae: Stenopogoninae), African Invertebrates 46 (1937), pp. 203-252 : 226-227

Afroholopogon vumba ( Oldroyd, 1974)

Figs 4 , 54–57 , 77

Holopogon vumba Oldroyd, 1974: 47 (in key); 1980: 362 (catalogue). Type locality: Zimbabwe.

Afroholopogon vumba: Londt 1994: 63 , figs 1, 2 head, 3 wing, 4 metathoracic leg, 23–25 ơ genitalia.

Redescription: Based on holotype.

Head:Antenna: Dark red-brown (tip of style and sensillum orange), fine silver pruinose, black setose; segmental formula 1.0:1.1:3.4:0.4:1.8. Face black, entirely silver-gold pruinose, mystax black, extending almost to antennal sockets. Face width:head width ratio 1.0:4.2. Frons and vertex black, extensively shiny apruinose but red-gold pruinose frons, black setose. Occiput black, silver pruinose, white setose. Proboscis red-brown, white setose. Palpi: plp 1 orange with white setae, plp 2 brown with dark red-brown setae.

Thorax: Mesonotum black, postpronotal and postalar lobes orange-brown, extensively shiny apruinose except for silver-gold parts as follows – lateral margin, anterior area adjacent to postpronotal lobe, and posterior area extending from margin anteriorly to just posterior of transverse suture. Setation: ac – fine red-brown; dc – fine red-brown; npl – 2 short black; sa – 1 thin long black; pa – few fine black. Scutellum black, largely shiny apruinose except for silver-gold anterior margin, disc asetose, margin with approx. 7 fine long black setae. Pleura predominantly orange-brown but with red-brown parts, gold-silver pruinose except for apruinose area on katepisternum, sparsely white setose. Wing ( Fig. 4 ) 6.7 x 2.2 mm, transparent with slight yellow staining, microtrichia redbrown, covering entire membrane, basal angle of r 4 17°. Halter brown with pale yellow knob. Legs: cx brown with yellow patches, silver pruinose except for some shiny bare areas, white setose (few black on anterior of cx 1); trochanters brown and orange; fem brown-orange (fem 1) brown-orange dorsally dark red-brown ventrally (fem 2) dark red-brown with orange-brown ends and dorsal strip (fem 3), white setose; tib orangebrown (tib 1–2) red-brown with orange-brown dorsally, macrosetae mostly black (a few white), setae white (a few dark red-brown); tar orange-brown, black setose.

Abdomen: Terga dark red-brown ( T1–6 ) distal segments orange-brown, shiny apruinose except for silver distolateral parts, small black setae (white laterally). Sterna orangebrown, silver pruinose except for tiny shiny apruinose spots, fine white setose. Genitalia: ơ holotype not dissected and macerated, topotypic paratype ơ illustrated ( Figs 54–57 ): Hypopygium unrotated; epand (in dorsal view) deeply incised forming two distally pointed lobes; goncx externally distally unilobed and projecting (in lateral view) beyond levels attained by epand and hypd; hypd (in lateral view), short, rapidly tapering (in ventral view) in two stages to elongate medial process .

Variation: Individual variation minimal, although the paratype lacking an abdomen is somewhat smaller and lacks the extensive orange pleural areas seen in other specimens.

Type specimens (seen): ZIMBABWE: ơ holotype, 3ơ 1^ 1? paratypes, ‘ 6,000 ft / N. Vumba, [1953S 3122E] / S. Rhodesia / 8.4.1965 / D. Cookson.’, ‘ Holopogon / vumba sp.n. / det. H. Oldroyd 1973 / Holotype’ [paratypes have appropriate labels].

Distribution (Table 1), phenology (Table 2) and biology: Known only from the type locality in the eastern highlands of Zimbabwe ( Fig. 77 ), and only collected during April.

Similar species: A. meilloni (see discussion).

Figures

Figs 1–6. (1) Diagrammatic representation of how the basal angle of the fourth radial cell (r 4) was measured; (2) Afroholopogon fugax (Loew, 1858), entire male,Akkerendam Nature Reserve;(3) Afroholopogon uranopia sp. n., male head, paratype, Graaff-Reinet; (4) Afroholopogon vumba (Oldroyd, 1974), wing, holotype; (5) Ischiolobos holcocephaloides (Lindner, 1955), left metacoxa, Mkuzi male, showing anterior peg-like process; (6) Ischiolobos mesotopos sp. n., entire male, holotype.

Figs 45–57. Afroholopogon species, male genitalia: (45–47) A. peregrinus (Engel, 1929), topotype, Willowmore: (45) lateral, (46) dorsal, (47) ventral; (48–50) A. tanystylos sp. n., paratype, 5 km E Augrabies Falls National Park’s main gate: (48) lateral, (49) dorsal, (50) ventral; (51–53) A. uranopia sp. n., paratype, Graaff-Reinet: (51) lateral, (52) dorsal, (53) ventral; (54–57) A. vumba (Oldroyd, 1974), paratype, N Vumba: (54) lateral, (55) dorsal, (56) ventral, (57) hypandrium in flatter view. Scale lines = 0.5 mm.

Fig. 77. Southern African distribution of Afroholopogon Londt, 1994 species: africanus – closed circle, anassa – open circle, chirundu – closed square, fugax – open square, vumba – closed triangle.