510 MKl:l-TI<- VARIATION. [I-ARTI. 



pair of articulated -pim-, tliis tibia bears ./IP* such spines, of which a pairstand 

 bi-twei-n tin- two i-xtni prot-e.--- . 1 n. di-position of these spines could not be made 

 i-li ar wit In iiit -I-M ml li L'u 1 1 -. '1 ben ore two complete tarsi ami both have their ventral 

 sin fad-* tiirin-il downwards. Tin- anterior tarsus is somewhat the smaller. I did 

 nut succeed ill definitely detennininn the homologies of the parts in this specimen. 

 It -Mould be spp-cially oiis,.] \ ed that while the tarsi are only two in number, suggesting 

 that tin- sii]>i inunicrary p;ut is >///<//.-. the spines indicate that there are here at 

 li-a-t some .-li-mi-iiN of fuith.-r r.-pi-tition.| Specimen figured by KUAATX, l>,-ut. cut. 

 /.(., IHH;I. xxxnt. p. 'I'll, fig. 1H, and Kindly lent by him. 



7s.", Ranzania bcrtolonii 1 1. aim -llieoi ID : in the right posterior foot the last joint of 

 tin- tai-ii- i- curved outward- aiipl bears six claws instead of two, and three onychia 

 in-trad of i pin . Tin- arrangement of the parts is somewhat complex and could not 

 well In- made dear without elaborate figures. Speaking generally, the last (fifth) 

 tar-al joint presents at its apex a large articular surface of irregular shape. This 

 surfaci- bears fipur laiye claws disposed in the same direction as the normal pair of 

 claws. Of the four claw> the two adjacent ones are in solid continuity for a part of 

 tlii-ii length, lieinr; joined together by t-hitin much as the extra dactylopodites are in 

 Fig. IH-I, in. It is clearly shewn that the conjoined claws are respectively the fellows 

 of the twcp free claws, for the two extra onychia stand one upon either side of and 

 i,|,i,i,.-ite to the cm \ature of the conjoined claws. Terminally the fifth tarsal joint 

 bears al-o a small pair of somewhat deformed claws with which an enlarged and 

 misshapen onychium corresponds. This specimen was kindly lent to me by M. 

 Hi mi (P \i.i vr M: KKIIVILLE and was mentioned by him in Hull. Soc. Ent. France, 

 Ser. I'P. vi. Is.st;, p. 



*78G. Rhizotrogus aestivalis $ (Lamellicorn), bearing supernuinci- 

 ary | tails <.t' double structure upon the right posterior oth tarsal 



(V\g. \~'l). The structure found in this case is very re- 

 markalilf and is, I believe, in some respects unique. The tarsus 

 is normal as tar as the extremity of the terminal joint, and the 

 abnormality consists entirely in repetition of claws and pulvillus. 

 The normal formation is shewn from the ventral surface in 

 Fix'. 172, A. There is an anterior claw, a posterior claw and a 

 small pulvillus, placed ventrally to the claws, bearing two hairs. 

 Fix- 172. 1-5, shews the abnormal foot from the ventral side. Each 

 claw gixe.s off from its base a ventrally-directecl supernumerary 

 claw, and each supernumerary claw is bifid at its point. Ex- 

 amined from below each of these extra claws is seen to bear 

 tin, </,-<>nref> separated by a ridge, and is therefore morphologically 

 a double structure. The next structure of importance is the 

 puKillus. The normal pulvillus (ptd) is in place and of the usual 

 form, but (Inrsiilly to it there is a supernumerary pulvillus (pul-) 

 of cylindrical form and rather longer than the normal pulvillus. 

 At its apex this extra pulvillus bears a median bifid hair with 

 another hair on each side of it; these hairs thus prove that the 

 extra pulvillus is morphologically double. 



In this foot, therefore, a supernumerary pair of claws and a 

 supernumerary double pulvillus are intercalated between the 

 normal da\\s and the normal pulvillus. Hence though the repet- 

 ition affects both claws and pulvilli, and the structures found 

 are sufficient for an incomplete pair of extra feet, yet the extra 

 part-- are disposed in the system of symmetry of the normal foot, 

 forming, all taken together, one foot only. Specimen very kindly 

 lent by Dr G. KllAATZ. 



