Keilin 1920. On two new Gregarines, Allantocystis dasyhelei n. g., n. sp., and Dendrorhynchus systeni n. g., n. sp., parasitic in the alimentary canal of the Dipterous larvae, Dasyhelea obscura Winn. and Systenus sp. Parasitology Cambridge, 12 1920: (154-158)