518 



M KIM STIC VARIATION. 



[PART I. 



joint apparently representing the normal 4th, 5th, and Oth joints not segmented from 

 other. [A* tlii- -ii|u i ilium T;U y part is in itself symmetrical it probably con- 

 tain- within it-elf ]>aits of a pair of clubs compounded in Position P. Cp. No. 

 7!i.".. J -l.vYM . II. 1 ., Trim*. .Inn-r. Knt. Soc., 1880, vm. p. 158, PI. IV. fig. 8. 

 Tl'V Polyphylla decemlineata 1 1. am. lln-orn). A specimen in which the right 

 antenna beai a partially dooble supernumerary branch in addition to the normal 

 null nna. I hi- additional structure articulates with the second joint of the antenna 

 by mi an- nt' a -ingle lain joint. This joint carries a double club consisting of two 

 of lamellje, Si ren being iii each set. The two sets of lamella are united at 

 thfir base- at an angle of fi.rty-fiv.- decrees. The plane of the normal club is per- 

 liciiiliculai tn that of tin- a I iin 'i ma) one-. The normal club itself is ith shorter than 

 that nt tin uther side. [I hi' details of the structure of this specimen are difficult 

 tn follow ami tin leader is n ('. mil for further particulars to the description and 

 figures given in thr m iginal.] JAYXE, H. F., Trams. Amer. l-.nt. Soc., LSHO, vm. 

 p. 



(l>) Tlie 



arising from the normal at separate point*. 



90. 



Odontolabis stevensii$ (Lucanida-). As tin.- repetition in 

 this specimen is almost complete and the relations of the parts 

 fairly clear though in some respects peculiar, a detailed account 



\\ ill III- llSi'ful. 



Tin- liody, legs, iVrc. arc' normal, save that the back of the 

 head and thorax have been crushed by some accident. The 

 antenna' are both abnormal in the way shewn in Fig. 170. The 

 cuiiditioii \\ill be better understood if the normal antenna is first 

 < I escribed. 



FKI. 17'i. odantnliiltia .ti'rt'n*ii, No. I'M. 'i'he head seen from below, and 

 enlarged views of the two antenna . H. right. L, left. There is some doubt as 

 to which of the branches is the normal and which the supernumeraries. See 



di -cription in text. 



The normal antenna of Odontolabix is much like that of its 

 ally l.in-nniiK trrntx, the Stag-beetle. It is made up of 10 joints 

 composing three parts differentiated from each other. 



The first., or "scape," is a single joint as long as the rest 

 of the antenna. It widens a little from its central end or base 

 tou.-mls I),,, apex, and is slightly flattened from above downwards. 

 The second part, or " tuniculus, 1 ' has six simple joints. The last 

 three joints form the rlub. They are flattened from above down- 

 wards and lie in a hori/ontal plane. The anterior ("inner") 

 border of each of these three joints is produced into flat ex- 

 pansions, covered with sensory pores, which together form a series 

 of serrations along the anterior border. When in its natural 



