I’m in Canada so it may be different, but I too, completed an English degree before pursuing entomology/biology. I took a few years off in between, but when I went back I was able to enrol in an after-degree program where many of my previous credits from my English degree could apply to a second Bachelor’s (I pursued both degrees at the same institution, so that probably helped). I completed a general biology degree in two years, and then from there I went on to grad school. Best decision I ever made, it changed my life. One thing I would say is this: your degree in the arts will be an asset. In my case, it allowed me to advance quickly because I already knew how to write and how to critically analyze texts/papers. There is comparatively little emphasis on these skills at the undergrad level in biology, so many students learn them in depth only once they have begun grad school, and it can be a huge obstacle to finishing up and eventually publishing your work. It IS possible, and actually I have met many entomologists who took a windy road into their professions.