516 



MERISTIC VARIATION. 



[part I. 



ally a pair of clubs, a right and a left, compounded together. 

 The histology of the supernumerary lamellae is just the same as 



Fig. 174. Geotrupes typhous, No. 794. Left antenna bearing a compounded 

 pair of clubs, ml, mr, morphological left and right of the extra parts. (The 

 property of Dr Kraatz.) 



that of the normal lamellae, all being covered with pubescence. 

 The form of the compound eleventh joint is somewhat irregular. 

 The extra parts are in the Position A of the Scheme. Specimen 

 kindly lent by Dr Kraatz, and first described and figured by 

 him in Dent, ent Zt, 1889, xxxni. p. 221, fig. 13. 

 795. Melolontha hippocastani <£ having supernumerary parts of 

 double structure upon both the right and the left antenna. 



Right Antenna. Third joint elongated, thickened and pre- 

 senting two articular surfaces ; of these one is terminal and bears 

 a normal autennary club, while the other is dorsal and bears a 

 supernumerary double club. This structure has the form shewn 

 in the drawings. Fig. 175, A, shews its appearance when looked 

 at from above, B shews the structure when seen from below and 

 externally. It consists of seven pieces shaped like half-funnels, 

 fitted into each other. 



Fig. 175. Melolontha hippocastani, No. 795. D, view of the whole head and 

 antennae after von Heyden. C, view of right antenna. B, detail of right antenna 

 from below. A, detail of the same from above. 



