CONSIDERATIONS. 473 



must have been struck with tlie total want of uniformity and 

 intelligibihty in the nomenclature. 



The head, according to M. Straus, may be considered to 

 consist of several parts ; one, all the parts of which are fixed, 

 he calls the cranium ; the others are the moveable parts ; 

 namely, the antennce, and parts of the mouth. 



The cranium is composed of four parts, which he terms, 

 ejiicrdne, cliaperon, piece hasilaire, piece 2ii'^basilaire, and 

 of the two cornece of the eyes. 



The piece prebasilaire is that part immediately behind the 

 labium ; its form is an elongate trapezium : the |;iece hasilaire 

 is placed immediately behind this, reaching from it to the 

 foramen occipitale ; internally, its anterior margin offers two 

 apophyses, to which the maxillce are articulated. The clia- 

 peron {chjpeus of Fabricius) is the part immediately behind 

 the labrum; the remainder of the cranium is the epicrane, 

 or piece epicrdnienne of our author. On its sides, near the 

 anterior margin, are fixed the cornece of the eyes ; and imme- 

 diately in front of these is a small opening, in which are 

 articulated the antennae. The epicranium is prolonged 

 inwards, beneath the eyes, so as merely to leave an opening 

 for the passage of the optic nerve. Near each antenna is 

 a long internal apophysis connected with that of the piece 

 hasilaire. 



The maxilla he divides into four parts, besides the palpus 

 and galea. The first piece is Kirby's cardo, which he calls 

 branche transverse. The second is the p>^^ce dorsale ; to the 

 internal margin of which is articulated the third, the inter- 

 maxillaire. The fourth, j)i^C6 palpifere, occupies the upper 

 surface of the maxilla, contiguous to the mandible : it is 

 nearly triangular, articulated by its external margin to the 

 piece dorsale. The galea is the part termed, by MacLeay, 

 the outer lobe. There is little new in his description of the 

 other parts of the mouth and of the antennse. 



Our author gives the name of pieces jugulaires to two con- 

 secutive plates contained in the inferior part of the skin of the 

 neck, and uniting the head to the prothorax. The first, or 

 jugulaire anterieure, is articulated by a small condyle at its 

 extremity to a tubercle placed on the internal side of the hinder 

 apophysis of the piece basilaire. At its opposite extremity it 

 is articulated to the second, or jugulaire jiosterieure ; and this 



NO. V. VOL. I. 3 p 



