Herewith, answers to the Monday Mystery:
c. lac scale
b. bee space
a. millipede
b. Baalzebub
b. mildew
d. delusory parasitosis
a. Xerces Society
d. protect against herbivory
d. Harmonia
c. cockroaches
Points are awarded to Katherine (9) and Dave the Bug Guy (1).
Incidentally, the Xerces Society is a fantastic organization, well worth your support: http://www.xerces.org/
I nailed the literary question.
wait, someone intentionally introduced cockroaches? (#9) why on earth?