You might want to ask this question in the Duty Officers (DOFFs forum). Also, join the in-chat channel DOFFJOBS...people will let you know if they have certain missions onboard and invite you if you ask nicely. There is also a spreadsheet at bit.ly/DOFFS which will show if a mission is currently available, and where.
Make sure you have 10 Bateret Incense and 10 Ferasan Nepata Leaves on hand for it.
Chrysalis 4/6 is a Development XP mission, it will be located in the Sector, usually in Cardassian areas of space.
it can be found in all of cardassian space (bu, at, za) and their star clusters (rolor, betreka, zenas). it's a recruitment assignment (you can tell this from looking at the icon in the chain ui), so you can also check your operations department head to see if he/she has it for you in those sectors.