Key to the species of Congomochtherus This key, modified from that of Londt and Tsacas (1987), includes a few additional characters. Identifications should be checked by comparing male terminalia with the illustrations provided (Figs 5-11), in addition to those supplied by Londt and Tsacas (1987). 1 Katatergal macrosetae predominantly black (accompanied by few, fine white setae) (♂ terminalia as Fig. 8) (Central Africa) ............................. lobatus Oldroyd, 1970 - Katatergal macrosetae yellow-white ...................................................................... 2 2 Antennal setae primarily black, a few white basoventrally on scape; postmetacoxal area membranous (bridge absent); female cerci with short spine-like setae (East & southern Africa) ...................................................................................................... 3 - Antennal setae primarily white, a few black distolaterally; postmetacoxal area bridged by a sclerotised bar; female cerci fine setose only (South Africa) ......................... 6 3 All femora with short brown-orange region proximally (East Africa) ................... 4 - Femora uniform black (tiny patches of orange colour may be seen but never on all femora) (southern Africa) ....................................................................................... 5 4 Anatergal setae black; T1 with at least a few black macrosetae laterally; hypandrium with subapical tuft of black setae (♂ terminalia as Fig. 10) ...................................... ...................................................................................... penicillatus (Speiser, 1910) - Anatergal setae white; T1 with white macrosetae only; hypandrium with apical tuft of white setae (♂ terminalia as Fig. 9) .................. oldroydi Londt & Tsacas, 1987 5 Mystax occupying more than half the distance between antennal bases and lower facial margin; male terminalia mainly black, hypandrium with a pair of black, narrowly separated setose tufts distomedially (♂ terminalia as Fig. 6) (widespread southern Africa & East Africa) ............................................ elferinki Londt & Tsacas, 1987 - Mystax occupying a little less than half the distance from antennal bases to lower facial margin; male terminalia mainly red-brown, hypandrium with a pair of white, widely separated setose tufts distally (♂ terminalia as Fig. 5) (Namibia & Angola). ........................................................................................ acuminatus Oldroyd, 1974 6 At least a few white setae on posterior part of ocellar tubercle; mystax occupying more than half the distance from antennal bases to lower facial margin; male hypandrium with longish, black macrosetae distolaterally (♂ terminalia as Fig. 7) (South Africa: Western, Eastern and Northern Cape) ..................... inachus Londt & Tsacas, 1987 - Ocellar setae all black; mystax occupying less than half the distance from antennal bases to lower facial margin; male hypandrium with short, white setae distolaterally (♂ terminalia as Fig. 11) (South Africa: Eastern Cape) ............................................ ................................................................................ potamius Londt & Tsacas, 1987

Published as part of Jason G. H. Londt, 2014, The Afrotropical Robber Fly Genus Congomochtherus Oldroyd, 1979 (Diptera: Asilidae: Asilinae), pp. 333-350 in African Invertebrates 55 (2) on page 345, DOI: 10.5733/afin.055.0204, http://zenodo.org/record/1472896