Cremastus Gravenhorst

Rousse, Pascal, Villemant, Claire & Seyrig, Andre, 2011, Ichneumonid wasps from Madagascar. V. Ichneumonidae Cremastinae, Zootaxa 3118, pp. 1-30 : 7

Cremastus Gravenhorst

Body slender. Occipital carina dorsally incomplete, the free upper ends down curved. Scutellum weakly to moderately convex, often with a weak lateral carina. Propodeum completely areolated or nearly so. First radial cell short. Areolet absent. Vein Rs&M opposite or slightly basal to vein cu-a, vein rs-m opposite to basal to 2m-cu by 0.5 its length. Hind wing with vein Cu + cu-a usually broken, vein Cu1 spectral to absent. Tergite I with long and shallow glymma, its lower edges separated and parallel, rarely almost touching. Thyridium absent. Epipleurum of tergite II narrow, separated by a crease, turned under. Apex of male gonosquama with a long ventral asymmetric lobe, this separated by a concave area from a dorsal tooth or short lobe near base. Ovipositor tip straight, decurved, or weakly sinuate.

The usual hosts are coleopteran stem borers or gall makers, but there are also records from lepidopteran larvae. This is a large genus of holarctic distribution. Of the two species known from the Ethiopian region, only C. madagascrienscis has been reported from Madagascar, where it appears to be endemic.