INTRODUCTION. 



and CETONIIN^E. The present subfamily and the 

 and HopLii:Nr.s: are the pre-eminently leaf-feeding groups of 

 Lamellicornia, and in these, although in different ways, we find a 

 special tendency to depart from the primitive simple form of 

 claw-structure. In the MELOLONTHIN^ and HOPLIINJE an even 

 more highly modified structure may be observed, but the great 

 mobility found in the Euteline claw does not occur there and, 

 with a few exceptions, the claws of all the feet are alike. In the 

 present group those of the first, second, and third pairs of legs 



Fig. 2. Tarsal claws: a, claws of Propomacrus (Euchirinse) ; b, hind claws 

 of Anomala dorsalis ; c, front claws of Anomala dorsalis, male ; d, ditto, 

 female ; e, front claws of Adoretus suturalis, female ; /, hind ciaws of 

 Adoretus suturalis, male ; g, middle claws of A. suturalis, male. 



mav all show some difference and are rarely all alike, the hind- 

 most pair, and sometimes the two hinder pairs, commonly having 

 a simpler form of claw than the others, that is, the larger one of 

 the two claws is less often cleft at the tip. The outer claw of 

 the four posterior feet, and the inner one of the front feet, are 

 always longer than the others, and it is the longer claw alone 

 which tends to bifurcation. The meaning of the varied forma 

 and combinations in which this bifurcation is found is less obvious 



