Genus Papilia 



having the bands and black margins of the wings decidedly 

 broader, a/id the lobe of the anal angle of the hind wing so much 

 lengthened as to give the wing the appearance of being furnished 

 with three tails. Expanse, 3.80-4.30 inches. 



Early Stages. All we know of these is derived from the 

 brief account given by Schaus in "Papilio," vol. iv, p. 100. Mr. 

 Schaus says that the larva "feeds on laurel." 



The insect is Mexican, and only occasionally occurs in Ari- 

 zona. 



(7) Papilio thoas, Linnaeus, Plate XLII, Fig. 4, $ (Thoas). 

 Butterfly. This species is readily distinguished from its near 



ally, P. crespbontes, by the greater and more uniform breadth of 

 the median band of yellow spots traversing both the fore and the 

 hind wing, and by the almost total absence of the curved sub- 

 marginal series of spots on the primaries. There are other points 

 of difference, but these are so marked as to make the determina- 

 tion of the species easy. 



Early Stages. These have never been fully described, but we 

 know that the caterpillar feeds upon the leaves of the lemon, the 

 orange, and other plants of the citrus group. 



P. tboas is not common within the limits of the United States, 

 where it is generally replaced by the following species; but it 

 occasionally occurs in the hot lands of the extreme southern por- 

 tion of Texas. 



(8) Papilio cresphontes, Cramer, Plate XLII, Fig. 3, $ ; 

 Plate II, Fig. 16, larva; Plate VI, Figs. 8-10, chrysalis (The Giant 

 Swallowtail). 



Butterfly. The principal points of difference between this 

 and the preceding species, its closest ally, have already been 

 pointed out, and are brought into view upon the plate. 



Early Stages. These are quite well known. The caterpillar 

 feeds upon Ptelea, Xantboxylon, and various species of Citrus. It 

 is very common in the orange-groves of Florida, where the peo- 

 ple call the caterpillar the "orange-puppy," and complain at times 

 of the ravages perpetrated by it upon their trees. It appears to 

 have been gradually spreading northward, and in quite recent 

 years has appeared at points in the Northern States where before 

 it had never been observed. It has been recently taken in On- 

 tario. It has become rather abundant in the vicinity of the city 

 of Pittsburgh, where no observer had seen it prior to the year 



3" 



