impatience, endeavouring to get at the inclosed female; and all this from the strongest desire of copulation; for the minute that action is performed by a male, the attractive property of the other ceases. The powers of perception and distinction, therefore, are very great; and what parts of the insects, unless it be the antennæ, are employed in this search I am at a loss to discover. However, at present, I presume it will not be necessary to offer any further reasons for using this term, as the name substituted is sufficient for it to be known by, it will fully answer the intended purpose. The names of the other parts are too intelligible to require any explanation. The plate annexed (being the last thing I shall speak of) requires but little to be said in its favour. The use and advantage of it is too obvious to dwell on. I have already mentioned, that engravings and delineations claim the preference in the highest degree of verbal descriptions; and as such, I presume, the reader will find this plate of the greatest service in assisting him to understand the descriptive parts with clearness and ease. I must only recommend it to him, if he is desirous of avoiding difficulty and trouble, to make himself fully acquainted with the terms and names of all the parts of insects, before he begins to read the descriptions. [Illustration] Explanation of Fig. I. _a_ The head. _b b_ The eyes. _c c_ The palpi. _d d_ The antennæ. _e e_ The shoulders. The patagia, or tippets, are placed here. _f_ The thorax. The part underneath and opposite to this is termed the breast. {xxvi}_g_ The abdomen, with the annuli or rings of which this part is composed; very conspicuous in such of the Lepidoptera as are figured in Plate 27, 28, and 29. _A A_ The anterior wings. _B B_ The posterior wings. _h h_ The bases of the wings. _i i_ The tips. _k k k k_ The anterior margin. _l l_ The posterior or internal margin. _m m m m_ The external edges. _n n_ The lower corners of the anterior wings. _o o_ The upper corners of the posterior wings. _p p_ The abdominal edges. In the butterfly tribe this part forms the abdominal groove. _q q_ The anal angle. _r r_ The tails; whereof some species have four, as in Plate 1, 2, and 7. _s s_ The eyes on the wings. From round spots resembling an eye. _t_ A waved bar. _u u_ An irregular indented bar. The terms upper side and under side, mentioned in all the descriptions of the farinaceous tribe, require no explanation. Explanation of Fig. II. _a_ The head. _b_ The palpi. _c_ The antennæ. _d_ The eyes. _e_ The dorsum of the prothorax, commonly called the thorax in beetles; whereof the under part is the prosternum. _f_ The lateral margin of the thorax. _g_ The posterior margin of the thorax. _h h_ The upper horn. _i i_ The lower horn. _k_ The scutellum. _l l_ The wing cases, or elytra.