ON A SECOND GENERATION OF OUR FORRES TRIPH^NA COMES, HB. 3 



almost justifies the vague suspicion Avhich I expressed that, contrary 

 to my previous ideas on the subject, little differences in breeding 

 conditions may tend to modify the resultant forms. The matter, at 

 least, demands further investigation/'' 



Brood D. — As I have already stated, this brood (Mr. Gardner's) had 

 probably different parents from brood C, but still it is a part of the off- 

 spring of brood A, The 17 " melanics " run from a fine crimison-red 

 form (with so little black freckling on thehindwings that it is, perhaps, 

 the neared thing to an " intermediate " with which I have yet had to 

 deal in these broods) to a dark curti-tn (_n<fn-nn/yrftcens) verging on 

 nifirescens. Six or seven are tolerably bright red, four or five others 

 more black-marked (all these go to ab. ciarki) ; five of the form in 

 which the red and black are thoroughly blended {civ. antea, xv., p. 219, 

 lines 3-5) ; and one is the darker specimen making a transition from 

 ab. ciirfisii to ab. niureHcens. It is noteworthy that the average is, 

 therefore, distinctly brighter (redder) than in broods C, E and G, a 

 higher percentage being of the lighter phase of ciarki (approaching 

 nifa in the forewings), whilst not one is mf/rescena, and only one even 

 closely approximates thereto. In Mr. Gardner's nine " typicals " there 

 is nothing special to remark beyond one or two points which will be 

 best dealt with under a final discussion of the whole material ; on the 

 average, the ground-colour is of the normal pallida tone, but one is 

 more pinkish-grey, one more tinged with slate-colour and one pretty 

 specimen is rather exceptionally light. The percentage of melanic 

 forms in brood D, it will be noticed, is 70|%, thus just a trifle higher 

 than in brood C, but not differing materially. 



Brood E. — This batch (Mr. Kaye's five) all came out more or less 

 of the darkest red forms, ab. curtiaii [nifo-ni(/resce)is), but they vary in 

 intensity and the darkest almost, if not quite, reaches the true ab. 

 nif/rescens. 



Brood F. — Mr. Mera's eleven (a large number, unfortunately, dried 

 up in the pupal stage) consisted of seven " melanics " and four 

 " typicals," or 63-6% against 36-8%. The former divide into three ab. 

 ciarki (two fine bright ones, the other a little darker), three ab. 

 ciirtixii (two of the more variegated black-red type, the third the more 

 " blended "), and one ab. nicjrescens. The typicals are fairly normal, 

 though one has a rather exceptionally light ground-colour, and all 

 have well darkened stigmata. 



Brood G. — Most of the eggs given to Mr. Shaw did not hatch, 

 but he was very successful in rearing those which did. They proved 

 an interesting lot, embracing a wide range of the forms, yet including 

 few of ab. ciarki (and these not very bright), a form which, as we 

 have already seen, was well represented in Mr. Baeot's (17 out of 77), 

 Mr. Gardner's (11 out of 24) and Mr. Mera's (3 out of 11). Mr. 

 Shaw's 28 consist of nineteen melanic and nine non-melanic, or 67*8% 

 of the former (virtually the same percentage as in brood C, which is 

 67'53) ; but the non-melanic are a more variable lot than Mr. Baeot's, 



* It may be further noted in this connection, that the only other brood in 

 which the ab. ninreacem has appeared is Mr. Shaw's (brood G), and that here 

 three or four, out of a total of only 28, belong to it ; the statistics given below 

 will, perhaps, allow investigators to make other curious comparisons as to the 

 dominance or otherwise of particular forms in particular batches, e.g., the much 

 higher percentage of bright-coloured ciarki in brood D than in brood G, &c. 



