I think that a secondary part of your question (pupal production of chemical signals, received by conspecific individuals or individuals of other insect species) can find answers by exploring for instance two very wide fields of entomological research, i. e., a) communication among social insects inside their colonies and, b) relations parasitoid-host and predator-prey (as regards entomoparasitic and entomophagous insects looking for pupae). 

I can add that, for some insects, intraspecific communication by pharate adults (adults still into the pupal cuticle) is known or hypothesized, having the function to synchronize (together with other factors) adult emergence of more individuals.

Best regards,

Rinaldo Nicoli

Thank you for your answer. It has been very helpful.  I didn't know about pharate adult communication, it looks really interesting. 

Hi,

I am pretty sure there is a publication from Johannes Steidel for Nasonia vitripennis. He has done a lot of work on odor recognition and memory using odor cues in pupae.

Here are some links to some of his publications but I am not sure in which you wil find what you are looking for (I haven't read them all just listen to his talks all the time :-) ):

http://onlinelibrary.wiley.com/doi/10.1111/j.1570-7458.2012.01253.x/full

http://link.springer.com/article/10.1007/s00114-008-0490-9#/page-1

http://rspb.royalsocietypublishing.org/content/282/1799/20141850.abstract

 Hope this helps

Taina

 This is really interesting. I had the idea that pupae must been able to produce, or at least sense chemical signals. These articles have been very useful. 

Thank you.