EXPLANATION OF PLATE 58. 



Drawn by A. H. Kirkland. 



1. Internal anatomy of larva of gypsy moth X 2 : nc, nerve 



cord; sg., silk gland; oe., oesophagus; b., brain; as., 

 anterior stomach; dv., dorsal vessel; ps., posterior 

 stomach; ro., reproductive organ; mv., malpighian 

 vessels; i., intestine; r., rectum. 



2. Internal anatomy of larva about to pupate X 2 : as., ante- 



rior stomach; ps., posterior stomach; dv., dorsal ves- 

 sel ; ro., reproductive organ. 



3. Section through anal segment of larva about to pupate, 



showing development of cremaster in anal shield X 4 : 

 as., anal shield; c, cremaster; r., rectum. 



4. Section through head of larva about to pupate, showing the 



development of the antenna cases beneath the larval 

 head covering X 4: dv., dorsal vessel; oe., oesophagus; 

 b., brain; a., antenna case. 



5 . Internal anatomy of female pupa X 2 : dv. , dorsal vessel ; 



ro., rudimentary accessory organs of reproductive sys- 

 tem ; r., rectum. 



6. Internal anatomy of female moth X 2: od., oviduct; cp., 



copulatory pouch; nc, nerve cord and ganglia; s., 

 atrophied stomach; b.., brain; dv., dorsal vessel; r., 

 rectum ; ag., accessory glands of reproductive system. 



7. Right silk gland of full-grown larva, enlarged. 



8. Posterior tip of silk gland, greatly enlarged. 



9. Part of malpighian vessel, greatly enlarged. 



10. Part of dorsal vessel of imago, showing aortic arch. 



Drawn by R. A. CooLEY. 



11. Micropyle of egg with surrounding rosette, greatly enlarged. 



12. A part of the same, still more enlarged 



