514 MKIM>Tir VARIATION. [PARTI. 



(1) Clt.'nr i-iist/x <>f ' F'lju.'i-iiumerary Antennae in Secondary 



Symmetry. 



ni} Tin' I'.rtrti ji'irt* iirifiin;i together. 



Phyllopertha horticola (Larnellicorn) : specimen in which 

 the right antenna bear- a supernumerary pair of clul>s. This 

 specimen in;iv conveniently be described in detail as it furnishes 

 a good example of the mode in which repetition of the antenna- 

 occurs in the Lunellicorns. The left antenna is normal and 

 p. -------- - niiH- joints (Fig. 173, L). The first is a large pear- 



-haped joint, articulating with the head by its narrow end. The 



IMC;. 17::. I'lu/ll.^nrtiia liortii-ola, No. 788. L, the normal left antenna. 

 the normal right antenna. /, r, extra left and right clubs. 



id joint is also a pear-shaped joint, of about half the size 

 of tin- first. The third, fourth and fifth joints are elongated and 

 <-\ lindrical. The sixth is short and wide. The seventh, eighth 

 and ninth arc each expanded into a lamella, These three la- 

 mella- are generally kept tinnly closed together and form the 

 sensory organ, or "club." In Melolontha (v. infra) and several 

 other genera of Lamellicorns, there are ten joint's, of which se\en 

 are developed as lamella-, forming the club. 



In the //(//// antenna (Fig. 173, R), which bears the extra 

 pair of chilis, tin- basal joint is rather thick. The second joint 

 is longer than it normally is, and curves slightly backwards and 

 do\\n\\ards. At its apex it bears the rest of the normal antenna, 

 which is in all respects well formed. In addition to the normal 

 antenna, the second joint upon its anterior surface gives attach- 

 ment to a large joint- which is imperfectly constricted into two 

 parts in a \ertical plane at right angles to the general direc- 

 tion of the normal antenna. Fach of these half-joints bears a 

 structure containing m itself all the pints proper to an antenna 

 peripherally to the third joint, the rinks l,,.ing well-formed and 

 normal. In absolute si/e they are eipial, but are a little smaller 

 i han t he normal antenna. 



