248 Dr. AfzeliusV Obfervations on the Genus Pan/us. 



The Antenna are very remarkable, and different from thofe of all 

 other infects, not only by their con fitting of no more than two 

 joints, but alfo by their fingular mechanifm. The under-joint is a 

 thick and almofl; round knob, truncated at both ends, and below on 

 the outride furniihed with a little bright ball, moving in a cavity 

 on the head, juft before the eye, between the clypeus and the an- 

 terior angle of the eye-focket. This ball is the pivot on which the 

 whole antenna rolls or performs its rotatory motion. It is very 

 vifible at its root, and eafily miflaken for an eye, being quite globu- 

 lar, and, by continual rubbing, highly poliihed. The upper joint is 

 alfo a kind of knob, but of a very different nature, and curioufly 

 conftructed. In the front it is outwardly marked with a raifed 

 line, or an edge, running from the bafe to the vertex, and behind 

 elongated into a tube or a hook pointing inwards. Beneath it is 

 f urnifhed with a pedicle, which having a ball at the end, and being 

 inferted in the under-joint, towards the outfide of its top, as into a 

 focket, makes the upper-joint qualified for a feparate motion, in- 

 dependent of that of the whole antenna. And as a proof that this 

 is really the cafe, it is to be obferved that there are fcarcely two 

 antenna? to be met with having the elongated hind part of the 

 upper -joint pointing exactly the fame way, though the under-joint 

 remains in its ufual pofition ; which makes it very difficult to de- 

 termine the true and mod natural direction of this hind part, which 

 however, I fhould think, muft be either juft above the under-joint, 

 or a little on the outfide of it. Linne gives to this part the name 

 of hook; and fo it is in my fpecies, but in his own it refernbles more 

 a tube or a blunt fpur, or rather it is nothing elfe than a Ihort 

 contracted elongation of the upper-joint. But, having made this 

 remark byway of explanation, I (hall not fcruple to retain the 

 original term unclnata^ as applied to the upper-joint, called by 



Linne 



