298 NATURAL ARRANGEMENT OP INSECTS. 



circle ; and this, from all we know of the natural series 

 in other groups, should have exserted jaws, in order to 

 represent the Lucanid(p, the Prionidce, the Staphylinid^, 

 and their corresponding types : no genus of modern 

 systems appears to possess these characters more than 

 Euryptera, a very curious insect we found in Brazil ; 

 its jaws are not, indeed, very decidedly exserted, but the 

 mouth is considerably produced : we are further dis- 

 posed to assign it this station, because it clearly repre- 

 sents Hispu and Lema, which seem to occupy the same 

 station among their congeners as, Euryptera here falls into 

 in the sub-family of NecydulirKB. On looking among 

 the other Leptiiridct, for representations of Euryptera, 

 we are immediately struck with its outward similarity 

 to Stenoderus, in the shape of its elytra ; while the 

 beautiful parallel between Distichocera and Lissonotus 

 is one of those resemblances all can perceive. So far as 

 our analysis has yet extended, the sub-genera of Clytus 

 and Necydalis are in unison with this series of the ge- 

 nera of Necydalince. 



(269.) ^V^e have frequently called the attention of 

 zoologists to a singular fact, which the structure of 

 Distichocera fully confirms. In the rasorial type (or 

 that which corresponds to it among insects), the antennae 

 are either greatly developed, or are of an unusually 

 complicated structure. The tribe of the Capricornes, 

 which represents the rasorial tribe of birds, are accord- 

 ingly remarkable for the excessive length of these mem- 

 bers. In like manner, as Distichocera represents these 

 tribes in the little circle of the A^ecydalince, so do we 

 find it is distinguished from all the remaining genera 

 by the very same circumstance, — namely, the peculiar 

 developement of its antennae. The great prevalence 

 of this structure is again seen in the tribe of Bomhyci- 

 d(B, or the silk-worm moths, where the antennae are very 

 highly developed ; while, in the very smallest group 

 in nature, we have a sub-genus of Necydalis where the 

 antennae appear as if borrowed from a Bombyx. It by 

 no means follows, however, that all rasorial types possess 



