294 Annals Entomological Society of America [Vol. IV, 



about the middle of the series and at one of the highest points 

 of the curve. In the ease of the pronotum the mother was 

 decidedly more melanic than the apex of the curve for either 

 annectans or melanopleura. The curves for these two forms 

 were not alike, annectans having the greatest number, 45 per 

 cent at the albinic end of the scale with the black spot well 

 enclosed by the surrounding white. In the melanopleura 

 series only 11 per cent were at this point, the largest number, 

 83 per cent, having the black spot rather weakly enclosed. 

 None of the annectans here showed the red pattern on the 

 elytra, as shown in Figure B, Plate XIX, though the mother 

 shews it faintly. 



Figure 3, Plate XX, represents the annectans female crossed 

 with hitmeralis male. In this case we would expect to find 

 only two strains of annectans. Here, however, the variation 

 was considerably broader than in the former case where four 

 strains were represented, the curve beginning at the same 

 point of albinism as the former case and extending to four and 

 a half confluences (that is to four and a pronounced tendency 

 to a fifth confluence), Figure 6, curve (b). The mother was 

 several degrees more albinic than the highest point of the 

 curve. Note here that in the mother there is an absence of 

 spot 4 and also that there is a small spot between spots 1 and 2, 

 which, though very unusual, probably denotes tendency to 

 confluence between spots 1 and 2. Neither the presence of 

 this extra spot nor the absence of spot 4 show in any of the 

 progeny examined, though both confluence and tendency to 

 confluence appear between spots 1 and 2. The mother of these 

 seems to have shown nothing of the red pattern mentioned 

 above and shown in Figure B, Plate XIX, but in the 37 off- 

 spring, 9 showed it very plainly, 16 moderately plain, 4 faintly, 

 and in G it was absent. 



Figure 4, Plate XXI shows a nielanopleiira-annectaus hybrid 

 female, crossed with a hunicralis male, and her first generation 

 progeny. Here there can be but one strain of annectans to 

 appear in the progeny. The curve of variation, Figure (>, curve 

 (c), Plate XXI, covers a somewhat wider range of variation 

 than in the case of the first instance, curve (a) where four 

 strains are represented, the largest number of confluences being 

 three. Here 23 out of 27 or 85 percent lack spot 6. In the pro- 

 nota of annectans a peculiarity was observed in that sometimes 

 either the basal marking or the apical median dash were lacking. 



