Isomyia Walker, 1859: 134

Genus: Isomyia Walker, 1859: 134 View in CoL (as subgenus of Musca ).

TYPE SPECIES: Musca delectans Walker, 1859 , by original designation .

NOTES: Isomyia is well represented in the Afrotropical and Oriental Regions, with some species reaching the southern Palaearctic Region (Zumpt 1958a: 11). The biology, life histories and immature stages are unknown. Cuthbertson (1933: 106) records I. oculosa (Villeneuve, 1917) (as Strongyloneura ) resting on twigs and tree trunks in dense forest in Zimbabwe. Cuthbertson (1937: 28) records I. cinerascens (Villeneuve, 1917) (as Strongyloneura ) in flowers of shrubs in March, and Cuthbertson (1939: 145) records I. dubiosa (Villeneuve, 1917) (as Strongyloneura sheppardi ) at blossoms of wild shrubs, also in Zimbabwe.

Isomyia darwini (Curran, 1938: 3) ( Strongyloneura) .

Fig. 97 View FIGURES 93–98 .

TYPE LOCALITY: Rhodesia [= Zimbabwe] .

DISTRIBUTION: Southern Africa: Botswana, Democratic Republic of Congo, Namibia *, South

Africa (Natal, Transvaal) and Zimbabwe.

MATERIAL: 1♀, Waterberg Plateau Park(3), xii.1991 – 18.i.1992, Pusch ( PT); 1♀, Hereroland­West at(2): 18.i–25.ii.1992, Pusch ( PT); 1♀, Aha Hills at(1): 21–25.xii.1998, Kirk­Spriggs(1), Marais & Mann ( MT); 1♀, Nama, 20–22.xii.1998, Kirk­Spriggs(1), Marais & Mann (LT).

NOTES: Biology, life history and immature stages unknown. Cuthbertson (1939: 144) notes the species (as Strongyloneura ) at flowers in Zimbabwe. In Namibia collected at UV­light and in pitfall and Malaise traps. North­central and north­eastern Namibia; apparently restricted to the ‘arid’ savanna biome ( Fig. 97 View FIGURES 93–98 ). Recorded in February and December in low numbers ( vide Table 2).

Isomyia deserti (Karsch, 1888: 378) ( Somomyia) .

Fig. 98 View FIGURES 93–98 .

TYPE LOCALITY: [ Tanzania] .

DISTRIBUTION: Southern Africa: Botswana, Burundi, Democratic Republic of Congo, Namibia *, South Africa (Natal, Transvaal), Tanzania and Zimbabwe.

MATERIAL: 2♀, Katima Mulilo , 11–14.iv.1997, Marais ( YP) floodplain savanna; 1♂, Kwando River: Susuwe , 26–30.ix.1998, Kirk­Spriggs (1) ( YP) dry woodland; 1♂, 1♀, same except: 28.ix–2.x.1998 ( MT) ; 2♂, 4♀, Okavango River at: 18–19.x.1999, Kirk­Spriggs (1), Pape & Hauwanga ( MT) ; 1♀, Restcamp , 9–13.iv.1993, Green ( MT) .

NOTES: Biology, life history and immature stages unknown. In Namibia hand­collected, in yellow pans and Malaise traps. North­eastern and north­central Namibia; apparently restricted to the ‘arid’ and ‘mesic’ savanna biome ( Fig. 98 View FIGURES 93–98 ). Recorded in April, September and October; most abundantly in October ( vide Table 2).

Isomyia hauwangai sp. nov.

Figs. 33–38 View FIGURES 33–38 , 43–44 View FIGURES 43–44 , 99 View FIGURES 99–104 .

TYPE LOCALITY: Namibia .

DISTRIBUTION: Rundu District, Bushmanland, Hereroland­West; apparently restricted to the ‘arid’ savanna biome ( Fig. 99 View FIGURES 99–104 ).

MATERIAL: vide description, p. 36.

Isomyia natalensis (Villeneuve, 1917: 347) ( Thelychaeta) .

Fig. 100 View FIGURES 99–104 .

TYPE LOCALITY: South Africa .

DISTRIBUTION: Southern Africa: Lesotho, Namibia *, South Africa ( Cape, Natal, Transvaal) and Zimbabwe.

MATERIAL: 1♂, Nhoma River at: 10.i.1991, Marais.

NOTES: Biology, life history and immature stages unknown. In Namibia hand­collected in January. The single Namibia record is from the ‘mesic’ savanna biome in north­eastern Namibia ( Fig. 100 View FIGURES 99–104 ).

Isomyia tristis (Bigot, 1888: 613) ( Curtonevra) .

Fig. 101 View FIGURES 99–104 .

TYPE LOCALITY: South Africa .

DISTRIBUTION: Widespread mainland Afrotropical Region: Democratic Republic of Congo, Ethiopia, Ghana, Kenya, Liberia, Lesotho, Mozambique, Namibia *, Rwanda, South Africa ( Cape, Natal, Transvaal), Tanzania, Uganda and Zimbabwe.

MATERIAL: 1♀, Katima Mulilo, 11–14.iv.1997, Marais ( YP) floodplain savanna; 1♀, Diamond Area 1 at(1): 16–29.ix.1994, Marais ( PT).

NOTES: Biology, life history and immature stages unknown. Cuthbertson (1934: 41, as Strongylo­ neura) records adult females on fresh cattle dung in Zimbabwe. In Namibia collected in yellow pans, pitfall and Malaise traps in April and September ( vide Table 2). The two Namibia records are from the extreme north­east of Namibia in the ‘mesic’ savanna biome and in the extreme south in the succulent karoo biome ( Fig. 101 View FIGURES 99–104 ).