748 



THE BUTTERFLIES OF NEW ENGLAND. 



be observed from week to week, and with it the relative numbers of cater- 

 pillars in each stage, tabulating all the facts that can be obtained, includ- 

 ing observations of the ovaries of such females as are captured. The 

 following would seem to me an interesting and valuable experiment for some 

 one having access to a green-house empty in summer to try : place together 

 males and females reared from July caterpillars in the northern half of New 

 England, ivithout other admixture, in such a green-house, covering the 

 open windows with netting to prevent escape, and placing an abundance of 

 Asclepiads in bloom and in young shoots within. If the butterflies will 

 breed in confinement, then the females should lay eggs, if, as Mr. Edwards 

 believes, there are in this district two broods of butterflies from July on ; 

 they should not lay eggs if, as I believe, there is but a single generation. 

 Coupled with this should be similar experiments further south, where there 

 is more than one brood, to see whether they will breed at all in such con- 

 fined quarters. 



LIST OF ILLUSTBATIONS.—ANOSIA PLEXIPPUS. 



General. 

 PI. 18, fig. 1. Distributiou in North America- 

 89 : 8. Trichogramraa intermedium, a para- 

 site. 



18. Mascicera arcliippivora, a dipte- 

 rous parasite. 



Egg. 

 Pi. 64, fig. 1. Egg, colored. 

 67 : 4. Micropyle. 



Caterpillar. 

 PI. 62, fig. 6. Internal organs of male, side 

 view. 



70 : 3. Caterpillar at birth. 

 74:5. Full grown caterpillar, colored. 

 78: 1-5. Front views of head, stages i-v. 

 86: 1. Main nervous cord. 

 37. Side view of head. 

 78: 10. Side view of inferior gland on first 

 thoracic segment. 



16. Head viewed from beneath, to 

 show the mouth-parts. 



Chrysalis. 

 5. Internal organs of female, side 



PI. 62, fig 

 view. 

 83:1. 



2. 



3. 

 86:17. 

 87:20. 

 during 

 view. 



Colored. 



Side view, outline. 



Dorsal view, outline. 

 Dorsal vessel. 



Three figures to show the change 

 pupation, according to the old 



Imago. 

 PI. 1, fig. 7. Male, both surfaces. 

 16 : 10. Upper surface male, plain. 

 33 : 23. End of male abdomen, with false 

 clasp. 



24. Male abdominal appendages. 

 38 : 2. Neuration. 



44: 2. Pouch of hind wings of (J . 



3. Cross section of same. 

 46: 5-10. Scales at edge of pouch and an- 

 drocouia. 



52 : 2. Side view of head and appendages 

 enlarged, with details of leg structure. 

 61 : 38. Cross section of scale. 



45. Cuticular processes on walls of 

 food reservoir. 



49. Protrusile fascicle of haii's of male 

 abdomen. 



58. Side view of end of abdomen, ? . 



59. The same, $ . 



62: 1. External anatomy of female. 



2. Internal organs of female. 



3. Reproductive organs of male, 

 dorsal view. 



4. The same, side view. 



87: 3. Pharyngeal sac and muscles, from 

 above. 



5. Pharyngeal sac and related parts, 

 seen from the side. 



9. Longitudinal section of maxilla. 

 23. Cross section of maxilla. 



25. Front view of head, denuded. 



