294 



MMKISTIC VARIATION*. 



[PART I. 



be determined by tin- manner of stretching of the wing-membranes. 



It must still 1).- remembered that in the great majority of cases of 

 ilar variation there U n<> change in the neuration. 



A- bo ill-- film-tin, ..f.H-ellar markings nothing is known, aiul I 

 am net aware that any suggestion has been made which calls for 



3< i LOUS lint ice. 



KVII.KX. H AS TO YAIMATIOX OF OCKLLI IN LEPIDOPTERA. 



General rtirinl.iliti/ of ocelli. 



The following are chosen to illustrate the general variability of 

 ..ci-lli in Satyrida-. Any of the common forms, such as C. tlamx, 

 P. megcera, &c. shew similar variations. Generally speaking the 

 condition is bilaterally symmetrical, but somewhat asymmetrical 

 examples ai-e not rare. 

 *44.S. Hipparchia tithonus : from some 80 specimens taken in one 



I-'i'.. TO. IIi/>inir,-!iiii tithoniiKi , cases illustrating Variation in number of ocelli. 

 I. In f. \v. the upper hnlf of the large ocellus lias a pupil, the lower has none: 

 in h. \v. no ocellus. II. I'.otli halves of large ocellus of f. w. have pupils, and the 



h. \v. ha- ocellus. III. Pupils of large ocellus of f. w. are larger: h. w. has 



two ocelli. IV. F. w. ha- a new ocellus ami the large double ocellus is half-joined 

 jecon 1 new ocellus. H. w. has two ocelli, one being placed otherwise than in 

 III. V. K. w. has two ocelli without pupils as \\cll a- the large double one. H. w. 

 hi- three ocelli. The wings of the other side corresponded nearly though not 

 riecuiately. II. is the most frequent form. 



iThis figure was drawn with especial care fioni the specimens by Mr Edwin 

 Wilson.) 



