522 



MERISTIC VARIATION. 



[PART i. 



must, I tliink. In- judged to In- a possible account, and in this case It 

 and // are, as i >_'! i-.U symmetry, in Position P. It is of course possible 

 that /,* ami A' are really the extra pair in Position A, hut the presump- 

 tion is rather the other way 1 . Specimen in Hope Collection at Oxford. 



cl) Cases <>t' <lnnl>h> c./fra antennae, Symmetry unknown. 



$02. 1" none of tin- following can any confident statement be made 

 as bo tin- symmetrical relations of the parts. Several of the 

 cases 1 have mvself seen, Imt I noticed no clear indications as 

 bo their symmetry. A good many of them however were ex- 

 amined b, .for.- 1 was fully alive to the importance of these matters 

 in the case of filamentous antennae, and perhaps if they were 

 studied with proper regard to the question of symmetry more 

 mi-ht he made of them. Many cases that follow are mutilated 

 or partly amorphous, ami of almost all the descriptions are very 

 imperfect. Fin- our purpose some value attaches to these records 

 as evidence of the distribution of such abnormalities, and to 

 any person who may hereafter pursue the subject a fairly com- 

 plete list of the references may be of use. To this therefore I 

 >hall routine m\self: tor on reviewing the abstracts that I have 

 mad.- of these examples it is clear that they only give the results 

 of siipertirial examination. 



Speaking generally, in these cases, from some one joint of an 

 antenna then- arises either a pair of extra antennas compounded 

 for a greater or less extent of their proximal parts, or two extra 

 antenna- distinct from their point of origin. 



The letters l\ ami L indicate the side affected, and the number 

 following is approximately that of the joint from which the extra 

 parts spring. In the greater number of sound cases the three 

 branches lie in . nearly in a horizontal plane and are, I anticipate, 

 in I'o-it ions A or P. 



Cases which seem from the indications to conform to the 

 Scheme are marked ||. Mutilated or partially amorphous cases are 

 marked . 



Blapa attenuata (Het.) H3 



Malachius marginellus L 2 



(Mai. I 



Timarcha tenebricosa II '.i 



il'hyt.) 



Clytus tricolor (Lonj,'.) L7 



C. arcuatus L 1 



Calopteron reticulatum L 1 



I Mai.) 



Carabus monilis (Car.) L 3 



C. auronitens L 7 



Ptinus latro (1'tin.) L ."> 



Elater murinus (Klat.) I. - 



Zonitcs pracusta (Het.) li '.'> 



MOCQUEKYS, Coleopteres (inonnau.r, 1880, 



p. ;>,.////. 

 Hid., p! 7,.i/. 



/^/V/., p. 13, fi/i. 



ibid.", p. I'.l, //'//. 

 //</(/. p. 20, jitj. 

 p. li"... //'/. 



p. 3,./i./. 



p. '., ./i.'/. 



p. s. fig. 



Ann. ,1,11 1 M<i<i. of X. II., 1831, iv. p. 470. 

 STAXNITS. Miill. Arch. f. An.it. Pliys., 1835, 

 p. 303. 



' This is perhaps too strongly put. 



- I >. -niptioii and ti^uic iiu-i.inrt. Apical joint of extra branch is litid. 



