Refer to the official Taxonomic Authorities and this forum thread for insect taxonomic resources. The websites mentioned in these links can be used as sources. You should find the taxon page, and, if it isn’t already in use as a source (aka doesn’t come up when you paste the name into the little Source box), you should add it, with the title, in-text citation, url, and full citation.
I’ve gone ahead and added the source for H. pseudomelanostele ssp. chryseus.