6 ILLINOIS BIOLOGICAL MONOGRAPHS [6 



List and Descriptions of Species Found in the Order Lepidoptera 72 



Family Gregarinidae Labb6 1899 72 



List and Descriptions of Species Found in the Order Diptera 73 



Family Gregarinidae Labbfi 1899 73 



Family Actinocephalidae L^ger 1892 75 



List and Descriptions of Species Found in the Order Siphonaptera 79 



Family Actinocephalidae L^ger 1892 79 



List and Descriptions of Species Found in the Subphylum Tunica ta 80 



List of Hosts wjth Their Gregarine Parasites 82 



Bibliography 86 



Explanation of Plates 92 



Index 101 



