Ischiolobos notios, Londt, 2005

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 : 236-237

Ischiolobos notios sp. n.

Figs 74–76 , 80

Etymology: Gr. notios (southern). Refers to the southern African distribution of this species.

Description: Based on holotype.

Head: Antenna: Dark red-brown, fine gold-silver pruinose, pale yellow-white setose; segmental formula 1.0:1.3:4.4:0.3:1.3. Face dark red-brown, entirely silver pruinose, mystax yellow-white, strong long setae along epistomal margin, small in upper region. Face width:head width ratio 1.0:4.8. Frons and vertex dark red-brown, entirely redgold pruinose, fine pale yellow-white setose. Occiput dark red-brown, silver-gold pruinose, pale yellow-white setose. Proboscis and palpi dark red-brown, white setose.

Thorax: Mesonotum dark red-brown, postpronotal lobes orange-brown, silver-gold and red-gold pruinose except for apruinose postpronotal lobes and three spots on each side of mesonotum (one anterior of transverse suture, two postsuture). Setation: ac – tiny pale yellow-white; dc – tiny yellow-white; npl – 3 short pale yellow-white; sa – 1 long pale yellow-white; pa – 1 long pale yellow-white. Scutellum dark red-brown, entirely silver-gold apruinose, disc with few fine small yellow-white setae, margin with 4 thin weak yellow-white setae. Pleura with dark red-brown and red-brown areas, entirely gold-silver pruinose, sparsely pale yellow setose. Wing 4.9 x 2.2 mm, dark brown, microtrichia dark red-brown, covering entire membrane, basal angle of r 4 20°. Halter pale yellow-white. Legs: cx dark red-brown, silver pruinose, white setose; trochanters orange-brown; fem orange-brown with dark red-brown spot at distal tip, pale yellowwhite setose; tib orange-brown, red-brown distally, pale yellow-white setose; tar orangebrown (slightly darker distally), setae predominantly brown.

Abdomen: Terga orange, T6–9 red-brown, fine silver-gold pruinose, T2–5 very weak to apruinose, yellow setose. Sterna brown-orange, distal segments orangebrown, gold-silver pruinose except for almost entirely apruinose S2–3, yellow setose. Genitalia of holotype not macerated but conform well with the illustrated Addo ơ paratype ( Figs 74–76 ): Hypopygium weakly sclerotised (stained for illustration) rotated through about 180°; epand (in dorsal view) incised to form narrowly-rounded lobes that project well beyond level attained by either goncx or hypd; goncx externally distally unilobed and projecting (in lateral view) beyond level attained by hypd; hypd (in lateral view) short, rapidly tapering to upwardly directed pointed medial process.

Variation: Sexes similar. Individual variation minimal.

Type specimens: SOUTH AFRICA: 1^ paratype, ‘ Papendorp [3142S 1813E] / S.A.M. Nov 56’ ( SAMC) ; 3ơ 2^ paratypes, ‘ Merweville [3240S 2131E] / Laingsburg Distr. ’ ~ ‘ H. Zinn / 1: 59’ ( SAMC) ; ơ holotype, ‘ Sth Africa: [Eastern] Cape Prov / Urquhart Park Caravan / Park in Graaff Reinet / 32°14'S: 24°32'E 800 m / J&H Londt 7.xii.1989 / Acacia savanna nr dam’; 2^ paratypes, ‘ Sth Africa: Cape Prov / Graaff-Reinet / Urquhart Park Caravan / Park 4–6.xii.1988 / 32°15'S: 24°33'E / JGH Londt Riverine / veget. Sandy ground’; 4ơ 6^ paratypes, ‘ Papiesfontein [3358S 2459E] / Gamtoos Mth. ’ ~ ‘S.A.M. / 1: 60’ ( SAMC) ; 1ơ paratype, ‘ S. Africa Cape Prov. / Addo district 3325 Da / Sundays River Valley / JGH Londt ex Malaise / 1–8.i.1978 ’; 1^ paratype, ‘ Resolution [3310S 2637E] / Albany Distr / 30/I 1929 / A. Walton’ .

Distribution (Table 1), phenology (Table 2) and biology: Fairly widely distributed in the southern parts of South Africa from the west coast through to the Eastern Cape ( Fig. 80 ), an area largely in the Succulent Karoo and Nama-Karoo biomes. The species flies from November to January.

Similar species: I. niveoscutum (see discussion).

Figures

Figs 65–76. Ischiolobos species, male genitalia: (65–67) I. holcocephaloides (Lindner, 1955), Mulanje Mnt.: (65) lateral, (66) dorsal, (67) ventral; (68–70) I. mesotopos sp. n., paratype, Queen Elizabeth Park: (68) lateral, (69) dorsal, (70) ventral; (71–73) I. niveoscutum (Hull, 1967), 10 km E Rhodes: (71) lateral, (72) dorsal, (73) ventral; (74–76) I. notios sp. n., paratype, Sundays River Valley: (74) lateral, (75) dorsal, (76) ventral. Scale lines = 0.5 mm.

Fig. 80. Southern African distribution of Ischiolobos gen. n. species: holcocephaloides – closed circle, mesotopos – open circle, niveoscutum – closed square, notios – open square.