In the article published in the April number on the subject of nomenclature, it is stated that Mr. Scrdder, in his Revision, has followed the same principles which govern all other departments of Zoology. It would be interesting to know what these universally adopted principles may be, for, judging from the recent publications on the subject, they must be yet unknown to a great number of those eminent in science Mr. Wallce, than whom we have no higher entomological authority, in his address to the London Ent. soc., recommends English naturalists to follow the British Association rules until others may be assented to, while these same rules find scant acceptance in Germany or France.