4D4 M ERISTIC VARIATION. [I'ART I. 



indicated in the Sdi. -mi- t'..r tin- po-ition I>AA. This specimen was described by M. 

 A. 1 \i\ii. i /,'. i . fl'I.nt.. \-^'.<. p. 331) and was kindly lent by him for further 

 examination. 



7 ."">. Chrysomela banksii . l'h\ tophagii : right hind tibia bearing an extra pair of 

 tar-i. The ImnliT of ili'- tibia which cm i .--] Kinds in position to the ventral or flexor 

 i. r if tin- noimal tibia i> co\eied with the hairs which characterize it iu the 

 iioimal limli; but tb.- opposite bonier of this abnormal tibia is similarly covered 

 with bail-. sh. -\\ing that tin- anterior parts of at least two tibia- arc included in it. 

 A iigid pioc, -- piojict- iiom the wide apex of the tibia. Upon the inner side of 

 tin- pi. ic. sa i- the artinilatii.ii t'..r the tai-u-, which from its direction and position 

 appear- to be the iicninal tat>u- . >f the limb. Outside the process articulates a 

 -lightly Mnall. -r tar-iis, wliicli from its form and from the plane in which it moves 

 / it tar-u-. flexing away from the normal one. At a point slightly external to 

 tin- i- the third tiir>u-. which is again a ri;iht tarsus and moves in a plane comple- 

 mentary t.i the middle one. The two are therefore a pair. The position of origin 

 i- anteii.,1 and .im-al. being neatly that marked DA, but the relative positions of 

 the extra tat -i or< approximately I'l'A. As to the nature of the tibial process I can 

 make n ; me. 1 1- ig. ir, 1 . i 



KM. Kil. Clii-i/xnnii'lii liinikfii. No. 7 ">">. View of right hind tibia from posterior 

 -111 tact'. A normal right hind tibia i- shewn for comparison. (From Proc. Zool. 

 Sot-.. -]' oimeo tin- property of L>r D. Sharp.) 



Thi- -i'eeini, ti is the property of I>r Sharp, who was good enough to lend it to 

 me. It was briefly described and figured by me /'. '/. . .s.. Is'.in, p. 583, but 1 was not 

 at that time aware of the cmplementaiy relation existing in these cases and failed 

 to notice the >ome\\hat incoii-picuous differences which are evidence of it in this 

 case. 



7">'i. Hylotrupes bajulus (Longic.): right middle tibia bears a supernumerary 

 pair of limbs having jiroximal jiaits in common. From the antero-dorsal surface of 

 the ba-e of tin- normal tibia, there arises a slender tibial piece which is not so long 



in- normal tibia and bears no spurs. At the apex of this supernumerary tibia. 

 which i> doubtless a double -tincture, articulate a pair of tarsi having their 

 tii -t and ,-econd joint* compounded together. After the second joint the two tar>i 

 -epaiate from . adi other an 1 each bears a pair of claws. The relative position of 

 the two tai-M when tli.-\ separate from rarh other is almost exactly that marked DA. 

 li -hould lie meiiti.inid that the -upei nmnerary parts central to the 3rd tarsal joints 

 an- not fully foime,i. u ing deiicieiit in thickness, and the transverse separation 

 between the 1-t ami 'Jiid t:n>al joints is incomplete. Specimen first described by 

 MO, V ,IM:\-. Col. anonn., l-^sn. p. :,:!. Hg. i a m indebted to Dr L. vox HEYDEN 

 for an oppoitunity of examining it. 



(." ruxiliun D. 



'7.37. Aphodius contaminatus^ (Lamellicorn.) : left middle tibia 

 li.'.'irin^ two "U|MTiiii]iiri-ai-y tarsi \vhidi stand very nearly in the 

 l>"siti"ii DDP, being rather m-aivr to D. The relative positions 



are shewn in Fi.^- l (i -- Tlv- arti.-ular surface at the apex of the 

 til>ia is extended aL-n-' an el, moated pnieess which projects on 

 the d..r-al side .if the tdiia. Tj ..... this extension >f the ape\ 

 articulate two extra tarsi. They -tand with their ventral or 



