The caterpillar which is the grub form of this beautiful creature is yellow, too--I cannot think of _Catopsilia eubule_ as being born of a grub of any other color--and feeds on the leaves of the wild senna, whose blossoms are also yellow. Thus, for once, anyway, we have a sequence of color culminating in the superlative. The cloudless sulphur is very fond of all flowers, and is said to be especially partial to orange blossoms. I can think of nothing more beautiful than the glossy green leaves of this delightful tree, interspersed with the waxy white fragrant blooms, the whole glorified with the hovering wings of this great golden yellow butterfly. The cloudless sulphurs did not have the sweet potato patch all to themselves, though they swirled there most conspicuously. I picked out of it, as I watched, occasional flecks of deep red which I took at first for monarchs, and so many of them were. The monarch is a common butterfly in the North, one of our most conspicuous varieties from early summer until the low swung sun beckons them South, whither they migrate in accumulating swarms from September until frost. In Massachusetts these migrations never contain enough members to make them conspicuous. Farther south the numbers increase until from New Jersey south we hear almost yearly accounts of the swarms. I took one of these monarchs as he sailed by me across the Orange Park boulevard. He was just _Anosia plexippus_, but such a splendid fellow! Never before had I seen a butterfly of this species quite so large or so richly colored. There was a velvety quality about all his markings and a sumptuousness of outline and development that made him far superior to the Northern monarchs which I have examined closely. Other specimens have confirmed this impression, and I begin to think that the Southern-born _Anosia plexippus_, developing under stronger sun and from a chrysalis un-chilled by frost, excels in beauty his Northern brother. I wonder if other butterfly hunters can confirm or disprove this. Along with the monarch came now and then the viceroy. This too is a common enough Northern butterfly, so much like the monarch, though of another genus, that in flight neither I nor the insect-eating birds are likely to tell the two apart. The monarch is beautiful but not tasty, and the insect-eaters let him fly by on this account. Something about him does not agree with them. On the other hand, _Basilarchia disippus_, the viceroy, is delectable from the flycatcher’s point of taste. But he escapes because he resembles the monarch. Hence many scientists say that the viceroy “imitates” the monarch for protection. In this I take it that they mean that he escapes because he resembles, not that he consciously assumes the colors of, the other insect. The survival of the fittest works inexorably, but without the consciousness of the individual. At any rate, the viceroy resembles the monarch very closely, though as a rule he is not so large.