500 MERISTIC VARIATION. [PART I. 



765. Scarites pyracmon (C'arab.). At base of posterior face of the 

 t rochanter of lot't imriiial front leg, immediately above the cotyloid 

 articulation was implanted an elongated lanciform joint. This joint 

 was directed backwards and represented a pair of trochanters com- 

 pounded by their anterior .surfaces. With each of the two apices of 

 this double trocliantrr was articulated a complete leg, in all respects 

 formed as an anterior leg. The two moved as a complementary pair. 

 [Details given. This is one of the earliest and best described cases. 

 . \-Mtvs 1 in ijuotin.L,' it points out that the description and tigure plainly 

 -In -w that tlie tv\o o\n-a legs were a pair, a right and a left, respect- 

 ively. They uric in t'act a pair, arising from the posterior surfaces of 

 the normal leg, and presenting their anterior surfaces to each other.] 

 LKKKHVKK, A.. Gv&rin'a Mag. de Zool., 1831, Tab. 40. 



76G. Geotrupes mutator (Lamellicorn) : two supernumerary limbs arising from 

 ffiiiur of light anterior leg. Femur greatly widened, upon posterior border giving 

 off a large prominence winch divides into two processes at right angles to each 

 other. Karli of tin -. proi . --. - hears u normal tibia and tarsus, but tbe foremost of 

 these tibiie is shapid as a 1,'t't tibia, having its serrated border placed anteriorly, 

 while the other extra tibia is formed as a rii/ltt tibia, having its serrated border 

 placed tn>*t,-i-ii-lt/. [The pair of limbs arise from the posterior surface of the normal 

 limb and have their anterior surfaces adjacent, as in Position P.] FKIVALDSKY, J., 

 Tt'rni. FUzetek., IMSI;, x. }>. 71 1. /'/. 



7<ii. Pterostichus lucublandus ? (Carabidic): third tarsal joint of left middle leg 

 at apex pic-, nts \\ide articular surface. On this stands a triple 4th joint, made up 

 of a single anterior portion, bearing the rest of the normal tarsus and a posterior 

 portion, double in structure, the two parts being completely united. The single 

 anterior part of this Ith joint bears a normal 5th joint with claws. The double 

 )io-terior part of the 4th joint bears a pair of separate 5th joints, each having a pair 

 of rlav,s. Of these the anterior is perfect, but the peripheral part of the posterior 

 "tli joint is crumpled, so that its claws are twisted out of position, but at its base it 

 -t.iml- exacth a- the noimal .~,th joint, and as the '"'tli joint of the anterior extra 

 tai.-ns, all three being in the same horizontal plane. These extra parts, therefore, 

 an- in the Position marked P in the Scheme and have the relations there indicated 

 for that position. This specimen was kindly lent to me by Mr HARRINGTON, who. 



first desciibed it Cull. l:llt., IS'JU, XXII. p. 124. 



(8) Positions VPP to VVP. 



'768. Ceroglossus valdiviae, Chili (Carabidse) : left anterior tibia 

 bearing a pair of supernumerary legs. The tibia widens, and in 

 its middle part gives oft' posteriorly and ventrally a wide branch 

 having the form of a pair of tibial apices compounded together. 

 The double tibia bears two tarsi (Fig. 100, .R', L') having a common 

 proximal joint, but these have unfortunately been broken, two 

 joints being missing from the one and three from the other. The 

 legs, are ;i right and left as usual, and they stand in the relative 

 positions m:irked \TP in the Scheme. This is a very simple 

 and striking case, for the animal is of good size and the parts 

 an- well formed. The two tibial spurs which are adjacent in 

 the two extra tibia- an- compounded so as to form a double spur 

 \\ itli two points as sJiewn in the figure. As shewn for the Position 



1 Mt>ii.-iti-<ixit>iti .< <'i>lfi>]>tcn>ruin, 1835, p. 44, I'l. 



