210 



PSYCHE. 



on each side above on the first abdom- 

 inal segment, a large, finely black- 

 rimmed, rounded, orange spot seated at 

 the posterior incisure on a fine black 

 line which enlarges where the spot 

 touches it ; the two series of small 

 abdominal spots have become distinctly 

 turquoise. 



In Heraclidcs crespliontcs (Fig. 5) 

 the young larva is provided with ex- 

 ceptionally large tubercles, which are 

 largest at the two extremities, and 

 especially on the first thoracic segment, 

 and these are all thickly beset with 

 bristles ; the body is largest in front but 

 scarcely tumid ; the colors are verv dark 

 brown, more or less mottled, with a 

 distinct white saddle and lighter ex- 

 tremities. Excepting that the front 

 portion of the body is a little tumid, 

 and that the tubercles become relatively 

 less important, there is no change in 

 the next two stages. In the fourth 

 stage the front part of the body be- 

 comes distinctly tumid and at the same 

 time develops an irregular, white, curv- 

 ing lateral band, setting ofl'the tumidity 

 to better advantage ; the colors and 

 patterns are otherwise the same as 

 before, but the tubercles have become 

 lenticles, and around them have clus- 

 tered rings of brighter color, by which 

 the body is much mottled. No further 

 change is made in the final stage except- 

 ing that the colors are more varied, the 

 whites have become more of a cream 

 color, and the mottling is more notice- 

 able, parti}- from the larger size ; in 



general the disposition of the mark- 

 ings is much as in tlie newlv born 

 caterpillar. 



In Papilio astyaiiax (Fig. 6), finally, 

 we have at birth a jet black caterpillar 

 with a white saddle across the middle, 

 and occasionall}' a white fleck or two 

 in front of it ; the body is cylindrical 

 or nearly so, but the thorax shows a 

 slight tumidity ; it is tuberculate, with 

 conical tubercles, beset with bristles ; 

 there is little inequalitv in the length of 

 the tubercles, but those on the side of 

 the body are dull orange. In the sec- 

 ond and third stages we have a repeti- 

 tion of the same features in color, form 

 and tubercles ; the orange, however, 

 becomes a little more vivid. In the 

 fourth stage, too, the dark tubercles 

 still remain but are relatively less im- 

 portant, and have at their anterior base 

 a yellow or orange spot ; while in the 

 place of the orange tubercles are 

 orange lenticles, and these and the 

 other orange spots break what would 

 otherwise be a broad, black, transverse 

 band in the middle of each segment ; 

 for now the bodv has become green 

 and is transversely striped with black 

 in the middle and (more narrowly) at 

 the front edge of each segment, and no 

 sign whatever of the saddle remains ; 

 the form at the same time becomes 

 more completely cylindrical, but the 

 body tapers in front. In the last stage 

 this general style of ornamentation and 

 of form is kept, but the tubercles and 

 lenticles altogether disappear. 



Date of issue of last Number of was mailed on the morning of the last day of 

 Psyche.— The last. April, number of Psyche the preceding month, as is our custom. 



