CHAP. XX.] 



EXTRA LEGS : POSITION D. 



495 



LT. 



758. 



plantar surfaces facing each other, and the tarsus RT is placed so 

 that its dorsal surface is 

 very nearly opposed to the 

 dorsal surface of the normal 

 tarsus LT, and the three 

 tarsi thus flex almost in the 

 same vertical plane. It is 

 to be observed, however, 

 that the tarsus LT is not 

 actually in the same plane 

 as the other two, but is a 

 little deflected from it so as 

 to flex rather more towards 

 the posterior surface of the 

 line than it would do if it 

 stood actually as L'T stands. 

 This may be made clear by 

 reference to the Scheme 

 (p. 481) : for while the two 

 extra tarsi are placed re- 

 latively to each other as if 

 they were in the position 

 D, the position of RT to 

 LT is that which it would 

 have if it stood in DDP. 



In this species the mid- 

 dle tibia in the male bears 

 one large spur, namely, the 

 posterior one, while the an- 

 terior spur is rudimentary. 

 PS in the figure, represents FlG _ m Aphodius contam inatus, No. 757, 



the large posterior spur of left middle tibia bearing extra parts. LT, 

 the normal tarsus LT, while normal left tarsus. RT, LT, right and left 

 1 etc lm 1 1 ftP's, 1 ' extra tarsi. PS, normal posterior *pur. RP'S 



a large ClOUDie spur nr i> , and ^p'^ spur representing compounded spurs 

 LP'S, Standing posteriorly of RT and LT corresponding with the single 



and between the two extra s P ur ps of normal, x, x, line of suture 

 . , ,i ■ , between these two spurs. The limb is seen 



tarsi represents tneir two from the postei . ior sur f aC e. (Specimen the 



posterior spurs. The double property of Dr Kraatz.) 



nature of this spur is seen 



when it is examined from the anterior side, for upon that surface 



it is marked by a longitudinal ridge-like suture. This specimen 



was first described by Kraatz, Deut. ent. Zt., 1876, xx. p. 378, 



fig. 13, and I am indebted to Dr Kraatz for an opportunity of 



examining it. 



Galerita africana (Carab.) : (Fig. 163) right middle leg normal as far as the last 

 tarsal joint, which bears three additional claws arising dorsally to the normal pair. 

 The extra claws are three in number, two of them being small and standing at the 

 anterior border of the limb, while at the posterior border there is one claw of larger 

 size. This larger claw is really a double structure, which is clearly shewn by the 



