Review of Namibimydas Hesse, 1972 and Nothomydas Hesse, 1969 (Diptera: Mydidae: Syllegomydinae: Halterorchini) with the description of new species Dikow, T. African Invertebrates 2012 53 79 111 655L Insecta Mydidae Nothomydas CoL Animalia Diptera 15 94 Arthropoda genus Insecta Mydidae Nothomydas CoL Animalia Diptera 15 94 Arthropoda genus  Figs22-42, 43  Diagnosis:The genus is distinguished from other Syllegomydinaeby its small size with a wing length of 5.5-8.9mm,the long proboscis that extends beyond the tip of the postpedicel,the entirely transparent wings,the slender legs,the anteriorly directed setae on abdominal tergites 4-8infemales,and structures of the male terminalia.  Description: Male. Abdomen and terminalia(Figs23-34):T1-7well-developed,entirely sclerotised,T8posteromedially weakly sclerotised,with anterior transverse sclerotised bridge connecting lateral sclerites;T7-8anteriorly with2lateral apodemes;S6regular,without any special setation posteromedially,S8not plate-like,medially narrow(broad laterally)and protruding ventrally(perpendicular to antero-posterior axis),not fused to T8dorsolaterally;epandrium formed by two sclerites,separated medially and only joining anteriorly,distally in dorsal view pointed with single tip posteromedially( N.aquilonius sp.n., N.gariepinus)or pointed with bid tip posteromedially( N.namaquensis,N.picketti sp.n.);subepandrial sclerite without lateral or median protuberances;hypandrium strongly concave,cup-shaped,entirely sclerotised ventrally(forming a single sclerite),entirely fused with gonocoxite,forming a gonocoxite-hypandrial complex,supra-hypandrial sclerite present;gonocoxite dorsoventrallyflflattened(same height throughout,expanded laterally and medially),without median or lateral protuberance,gonocoxal apodeme absent;2functional aedeagal prongs,extremely long and thin,mediodistally free,parallel or diverging laterally,distally straight or only diverging slightly laterally;aedeagal epimere present,distally simple,evenly rounded;  Figs21, 22.Female genitalia in dorsal view(anterior on top):(21) Namibimydas gaerdesi(AAM-000866),(22) Nothomydas namaquensis( paratype).Scale lines= 1mm. lateral ejaculatory process absent;ejaculatory apodeme formed by single dorsoventrally orientedplate;ventro-median margin of dorsal aedeagal sheath heavily sclerotised(appearing entirely closed);dorsal aedeagal sheath long,sperm sac entirely covered;sperm sac appearing more-or-less heavily sclerotised. Female. Abdomen and genitalia(Fig.22):Densely arranged anteriorly directed setae present on T3-8and S3-8;T8with broad anterior rectangular apodeme;T9formed by wide,rectangular sclerite with median protuberance;T9+10entirely fused,T10divided into2heavily sclerotised acanthophorite plates,5-6acanthophorite spines per plate;2spermathecae,all equally large,formed by more-or-less expanded weakly sclerotised ducts;individual spermathecal duct long;S9(furca)formed by1sclerite,ringlike(joined anteriorly and posteriorly),anterior furcal apodeme present,2lateral projections forming divided apodeme,lateral furcal apodeme absent,median furcal bridge absent.