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EXPLANATION OF PLATES I AND II. 



[For purposes of reproduction it has been necessary to reduce the size of the figures 

 by ith. The magnifications given refer to the author's original drawings. Eds.] 



Fig. 1 . Dorsal aspect of the egg of Pegomyia hyoscyami. X 80. 



Fig. 2. Mature larva of P. hyoscyami. X 10*5. pt sp. prothoracic spiracle. 



Fig. 3. Posterior aspect of ultimate segment of same to show the position of the tubercles 



and the posterior stigmata (p.sp.). an. anus (highly magnified). 

 Fig 4. The three first segments of same, ventral aspect X 15. s.p. sensory papilla ; 



a. antenna ; md.s. mandibular sclerite ; pt.sp. prothoracic spiracle. 



