CHAP. XX.] EXTRA LEGS : I'OSITIoX VAA. 485 



(2) Position VAA. 



742. Feronia i Pterostichus ) miihlfeldii $ (Carabidse) : left 

 middle tibia bearing two supernumerary tarsi arising by a 

 common proximal joint (Fig. 15(3). As in other cases of super- 

 numerary tarsi arising from the tibia, the apex of the tibia 

 itself is really a triple structure, containing parts of the apices 

 of a pair of tibia: in addition to the normal apex. This is shewn 

 by the presence of three pairs of spurs, &c. The additional 

 parts are in this case anterior and ventral to the normal apex 

 and a complementary pair. All three an- completely blended 

 together, forming in appearance a single apex. The relations of 

 the three component parts are almost exactly those indicated 

 in the Scheme for the Position VAA. 



FIG. 156. Pterostichus miihlfeldii, No. 742. Semidiagrammatic iv]>rrs.-m;itifii 

 of the left middle tibia bearing the extra tarsi upon the antero-ventral border of tli.- 

 apex. L, the normal tarsus ; E, the extra right ; I/ the extra left tarsus, 

 property of Dr Kraatz.) 



The two extra tarsi (R, L'} arise by a common proximal joint 

 of double structure having two complete ventral surfaces inclined 

 to each other as in the Position VAA. Peripherally to this the 

 two tarsi are separate. The tarsus which is nearer to the normal 

 tarsus is perfect, and stands in the schematic position, 

 second joint of the remoter arises in the position shewn for \ AA. 

 but its apex is slightly shrivelled and in consequence tin- re- 

 mainder of this tarsus, though perfect in size and form is thrown 

 a little out of position. This specimen was kindly lent to me 

 by Dr KRAATZ, and was originally described and figured 1\ him 

 in Dent, ent. Zt., 1877, xxi. p. 56, fig. 21. 



Aromia moschata $ (Greece) (Longicorn) : righl 

 tibia enlarged at apex bearing anteriorly a supernumerary pair 



