A new species, Cassidibracon gracillariae Quicke sp. n. from India, is described and illustrated and differentiated from other Indian species. The three known specimens were each reared from distinctive, exposed, bubble-coated cocoons of the gracillariid moth Stomphastis chalybacma (Meyrick 1908), which superficially resemble insect egg clusters. This is the first reported host record for the genus Cassidibracon Quicke.