6 ILLINOIS BIOLOGICAL MONOGRAPHS [6 



List and Descriptions of Species Found in the Order Lepidoptera 72 



Family Gregarinidae Labbe 1899 72 



List and Descriptions of Species Found in the Order Diptera 73 



Family Gregarinidae Labbe 1899 73 



Family Actinocephalidae Leger 1892 75 



List and Descriptions of Species Found in the Order Siphonaptera 79 



Family Actinocephalidae Leger 1892 79 



List and Descriptions of Species Found in the Subphylum Tunicata 80 



List of Hosts with Their Gregarine Parasites 82 



Bibliography 86 



Explanation of Plates 92 



Index 101 



