All species of the genus Gibellula were regularly collected on arthropod hosts in Ghana. Gibellula alata Fetch, G. leiopus (Vuill.) Mains and G. pulchra (Sacc.) Cavara are briefly mentioned together with notes on their distribution. These species are considered to be specialized parasites. The new genus Pseudogibellula is proposed to accomodate Gibellula formicarum Mains, separated from the phialidic Gibellula by conidia produced singly and on sympodial conidiogenous cells. P. formicarum is common on a wide range of arthropod hosts and grows freely on agar media.