508 MEMSTIC VARIATION. [part i. 



numerary parts arise. The fourth and fifth joints of the supernumerary 

 tarsi are of double structure, but are not separated from each other. 

 The double fifth joint bears two pairs of claws, of which the two adja- 

 cent members are compounded together at their bases. The plane in 

 which one pair of claws stands is about at right angles to the plane in 

 which the other pair is placed, the opposed surfaces being ventral 

 surfaces. Stated in terms of the Scheme on p. 481, the supernumerary 

 tarsi are placed as in the position DDA, whereas their position of 

 origin is DA A. It is noticeable that the normal fifth joint does not 

 stand quite in its usual jDosition, but is a little twisted so that it par- 

 tially turns its ventral surface in an anterior direction. This specimen 

 was described and figured by Fauvel, Rev. d'Fnt., 1883, n. p. 93, PI. 

 ii. No. l'. It was kindly lent to me by M. Bleuse, to whom it belongs. 



780. Alaus sordidus (Elateridae) : Ceylon, femur of right middle leg 

 bears two supernumerary legs arising from its postero-dorsal surface. 

 All three legs are somewhat abnormal in form and the principal femur 

 is partly shrivelled at its base. At a point on the postero-dorsal sur- 

 face about halfway from the apex there is a large, irregular boss from 

 which the two extra femora diverge. Of these that wdiich is nearest 

 to the normal leg may be distinguished as a left leg by the planes of 

 movement of its tibia and tarsus, while the remoter leg is a right leg. 

 The tarsus of the latter is broken but was probably complete. The 

 surfaces which the extra legs present to each other are structurally 

 anterior surfaces, but the relative positions of the three legs do not 

 correspond with any of the positions shewn in the Scheme. It should 

 however be noticed that this fact may be connected with the presence 

 of the amorphous thickening at the point of origin of the extra femora. 

 Specimen in Hope Collection first described and figured by AVestwood, 

 Oriental Entomology, PL XXV. fig. 9, and mentioned Proc. Linn. Soc. 

 1847, p. 346. 



781. Clythra quadripunctata (Phyt,): left anterior trochanter bears 

 two supernumerary legs. Both the normal leg and the two extra ones 

 are complete. The position of the latter is very peculiar ; for, arising 

 from the anterior surface of the trochanter, they turn their structurally 

 dorsal surfaces towards the anterior surface of the normal leg, which 

 thus stands between them, one of them being above it and the other 

 ventral to it. Of these that which is placed dorsally is structurally a 

 right leg, while the lower one is a left, like the normal one. Both the 

 extra legs are also partly rotated so that their ventral surfaces are 

 partially directed upwards. From these facts it appears that the 

 position of these extra legs relatively to the normal one does not 

 correspond with any of the positions indicated in the Scheme, and it 

 did not seem to be possible to refer this deviation from the usual 

 arrangement to any special malformation of any of the parts. Speci- 

 men originally described by Mocquerys, Col. anorm., p. 42, fig. 



782. Clytus liciatus (Long.) : right tibia reduced and thickened, being- 

 shapeless and bent. Its apex presents two articulations, the one anterior 

 and the other posterior, the latter bearing a normal, 4-jointed tarsus. 

 The anterior articulation bears a slender double tarsus, the two parts 

 of which are compounded in the 1st, 2nd, and 3rd joints but separate 

 in the 4th or terminal joints. The supernumerary tarsi are very 



