ENTOMOLOGY.

by

DR. W. F. ERICHSON.

TRANSLATED BY A. H. IIALII)AY. ESQ.[With notes and additions in brackets.]

Agassiz Nomenclator Zoologicus, a work urgently de-manded in Entomology, if in any department of Zoology ,has been steadily proceeding, and draws near the conclusionwith the year 1845.

Recherches sur les transformations des appendices dansles Articules, par M. Brulle. (Ann. Sc. Nat. 3me Ser. i,p. 271.)

A work treating at large of the same subject, which has already occupiedSavigny (Mem. sur les Anim. sans Yert.) and Erichson, in his‘Entomo-graphien.’ (Zool. Char, der Ins., &c.) Had the author been acquainted withthe last-named essay, which was published five years before, he would pro-bably have avoided some errors into which he has fallen. One of these isthat he regards the antennae (feelers) as analogous to the legs and jaws.That the two latter are only different modifications of similar organs hasbeen a settled point since the researches of Savigny ; but too much regardhas been paid to the essential destination of the parts, to allow of theantennae being placed in the same class with them before. The antennaeare exclusively organs of sensation, deriving their nerves from the brain,while those of the mouth and legs originate from the lower ganglions. Theauthor, following Latreille and others, considers the upper jaws of Arach-nida to represent antennas; chiefly on account of their position so farabove the cavity of the mouth. But independent of the other reasonsfor considering the parts in question as analogically upper jaws (man-dibuke), we have pretty convincing evidence in the saliva vessels (orpoison vessels) opening into them in the Spiders and Solipugas (Araneidse,