ENTOMOLOGY. 



BY 



DR. W. F. ERICHSON. 



TRANSLATED BY A. H. HALIDAY, ESQ. 



[With notes arid additions in brackets.] 



Agassiz Nornenclator Zoologicus, a work urgently de- 

 manded in Entomology, if in any department of Zoology, 

 has been steadily proceeding, and draws near the conclusion 

 with the year 1845. 



Recherches sur les transformations des appendices dans 

 les Articules, par M. Brulle. (Ann. Sc. Nat. 3me Ser. i, 

 p. 271.) 



A work treating at large of the same subject, which has already occupied 

 Savigny (Mem. sur les Auiin. sans Vert.) and Erichson, in his 'Entomo- 

 graphien.' (Zool. Char, der Ins., &c.) Had the author been acquainted with 

 the 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 is 

 that he regards the antennae (feelers) as analogous to the legs and jaws. 

 That the two latter are only different modifications of similar organs has 

 been a settled point since the researches of Saviguy ; but too much regard 

 has been paid to the essential destination of the parts, to allow of the 

 antennae being placed in the same class with them before. The antennae 

 are exclusively organs of sensation, deriving their nerves from the brain, 

 while those of the mouth and legs originate from the lower ganglions. The 

 author, following Latreille and others, considers the upper jaws of Aracli- 

 nida to represent antennae ; chiefly on account of their position so far 

 above the cavity of the mouth. But independent of the other reasons 

 for considering the parts in question as analogically upper jaws (man- 

 dibulae), we have pretty convincing evidence in the saliva vessels (or 

 poison vessels) opening into them in the Spiders and Solipugas (Araneidse, 



