146 SIXTH ANNUAL REPORT 



HersG\ yet Boisduval {auctore Morris) gives his celtis the saaie size 

 and form as his Clyton^ while Fabricius mentions no difference in4he 

 size of his two species ; so that if we really have to do with three in- 

 stead of two species, then Alicia Edw., so far as size is concerned, is 

 but a redescription of celtis Boisd., and the small form which occurs 

 in the Middle and Western States remains undescribed. The fact 

 that Boisduval cites his celtis from the Southern States, and that his 

 description of the larva does not at all correspond with mine, would 

 indeed give such a view a degree of plausibility; but, for my own 

 part, I much prefer to believe that the differences in the butterflies 

 are varietal, and that the discrepancies between the descriptions of 

 the larva may be accounted for on the strong probability that Boisdu- 

 val's description and figure of the larva are as untruthful as those of 

 the chrysalis. But all such questions must be left to the future to 

 decide ; meanwhile Mr. Edwards's opinion is, in one sense, as rightfully 

 held as Mr. Scudder's or mine. 



DESCRIPTIVE. 



Apatura Lycaon — Egg. — Average diameter 0.03 inch. When first laid, opaque 

 white, becoming day by day more translucent. About and around the crown are a 

 few pale purplish specks and marks, which deepen until they are sometimes black, and 

 as the embryo develops, its black head shows plainlj"^ through the crown and the egg 

 becomes slightly grayer. Shape globular, the top flattened, the base still more so ; 

 about as wide as deep, averaging 0.025 inch either way, the depth most often exceeding. 

 Prom 19-20 longitudinal, rather prominent ribs, and about twice as manj^ veiy delicate 

 transverse strise, the latter best seen on the empty shell, and both ribs and stria3 becom- 

 ing obsolete on the crown. 



Attached not very firmly and always on the underside of a leaf, in batches of from 

 1-12 (7, 7, 5, 7, 7, 1, 4, 2, 3, 7, 11, 12, observed). Egg period from G-10 days. 



Larva — Newly hatched 0.07-0.08 inch long. Body cylindrical, tapering very slightly 

 behind, pale yellow, immaculate, with concolorous piliferous dots giving rise to short 

 pale hairs, 4 of these dots dorsally trapezoidal and 3 lateral around each spiracle. 

 Head twice as large as joint 1, polished black, slightly bi-lobed, with very minute 

 pilose point? and a few long hairs, but no horns whatever. Anal horns pale just after 

 hatching, becoming dusky at tips, short, and terminating usuallj' in three blunt, pilose 

 lobes. When two days old, the dorsum flattens and the characteristics of the second 

 stage begin to show. In the second stage the color is green, the form less cylindrical, 

 each joint with four tolerably distinct annulets and numerous pilose papill.'e. A 

 straight subdorsal, longitudinal, yellow stripe connects across dorsum on anterior 

 annulet, and sometimes on second, leaving, in consequence, a series of subquadrate 

 dark-green dorsal spaces ; a supra-stigmatal, undulate, paler and narrower line, and a sub- 

 fetigmatal one straight and of the same thickness. Anal horns less blunt at tip. Head 

 broader than long, with the sides bulging and with two horns on top diverging at right 

 angles from each other, and in length about one-third the width of head, each ending 

 in a prominent, more or less acute bifurcation, and giving out three lesser branches 

 from the sides : also with a prominent lateral, slightly decurved and acute spine, a 

 lesser one above and below this, and two on top between the bifurcate horns. The 



