On Two New Gregarines, <i>Allantocystis dasyhelei</i> n.g., n.sp., and <i>Dendrorhynchus systeni</i> n.g., n.sp, Parasitic in the Alimentary Canal of the Dipterous Larvae, <i>Dasyhelea obscura</i> Winn. and <i>Systenus</i> sp
Parasitology