The Honey Bee and the Fly 375 



and precision to drill a hole into the tree. When the Tremex burrow is 

 reached, she deposits an egg in it. The larva that hatches from this egg 

 creeps along this burrow until it reaches its victim, and then fastens 

 itself to the horntail larva which it destroys by sucking its blood. The 

 larva of Thalessa, when full grown, changes to a pupa within the bur- 

 row of its host, and the adult gnaws a hole out through the bark if it 

 does not find the hole already made by the tremex." 



Practically all the mites ( ) and ticks ( ), 



animals closely allied to the spiders, live parasitically. 



Truly Dean Swift was right when he said : 

 "Great fleas have little fleas 



Upon their backs to bite 'em, 

 And little fleas have lesser fleas, 

 And so ad infinitum." 



References. 



Sanderson and Jackson's "Elementary Entomology." 



J. Arthur Thomson, "Outlines of Zoology." 



Linville and Kelly, "A Text-book in General Zoology." 



Leland O. Howard, "The Insect Book." 



Vernon L. Kellogg, "American Insects." 



Robert W. Hegner, "College Zoology." 



J. H. Comstock, "Insect Life." 



J. H. and A. B. Comstock, "A Manual for the Study of Insects." 



A. S. Pearse, "General Zoology." 



C. A. Ealand, "Insects and Man." 



E. Dwight Sanderson, "Insect Pests of Farm, Garden and Orchard." 



L. S. and M. C. Daugherty, "Principles of Economic Zoology." 



Joseph Lane Hancock, "Nature Sketches in Temperate America." 



Riley and Johannsen, "Handbook of Medical Entomology." 



Jordan and Kellogg, "Animal Life." 



Jordan and Kellogg, "Evolution and Animal Life." 



Riley, "Destructive Locusts." U. S. Department of Agriculture, 

 Bulletin No. 25, 1891. 



C. F. Hodge and S. Dawson, "Civic Biology." 



James A. Nelson, "The Embryology of the Honey Bee." 



Royal N. Chapman, "Animal Ecology with Special Reference to' 

 Insects." 



H. T. Fernald, "Applied Entomology." 



J. W. Folsom, "Entomology, with Special Reference to Its Biologi- 

 cal and Economic Aspects." 



Augustus D. Imms, "General Textbook of Entomology." 



Arthur S. Pearse, "Animal Ecology." 



H. J. Van Cleave, "Invertebrate Zoology." 



Charles M. Wenyon, "Protozoology, a Manual for Medical Men, 

 Veterinarians, and Zoologists." 



