Auyiist — October 1S90.I 



PSrCHE. 



399 



witli a yellowish stripe on each side, 

 continuous with the subdorsal stripe 

 along the bod}-, which is now broad 

 and diffuse, with a dark green shade 

 above it. The lateral yellowish stripes 

 as before. The horn is a little shorter 

 than in the preceding stage, and the 

 green at the base on each side en- 

 croaches more on the black, extending 

 higher, while the extremit}' of the horn 

 is tipped with green, in one specimen 

 distinctly so. There are eight trans- 

 verse wrinkles to each segment, and the 

 white granulations are more distinct 

 than before. The spiracles are white, 

 with two twin vertical elliptical spots 

 on each side nearly meeting in the 

 middle. 



In this stage when disturbed the 

 caterpillar will turn the head, and the 

 front part of the body, represented bv 

 the three thoracic segments, over upon 

 the back of the abdominal region so 

 that the feet are held up vertically, as 

 in Datana and other larvae. 



Stage V. — Last stage, moulted, 

 21-22 July. Length 54-55 mm. The 

 head is as in the previous stage, but 

 rather more angular on the sides. The 

 lateral yellowish line on the head is very 

 distinct and continued as distinctlv on 

 the thoracic segments as far as the 

 middle of the 3rd thoracic segment ; 

 beyond this the line is indistinct on the 

 three following segments, becoming 

 distinct again behind the middle of the 

 body. 



The prothoracic segment is a little 

 wider than the head, and about one-half 

 as wide as the 3d thoracic segment. 



The lateral yellowish stripes are dis- 

 tinct, not reaching either the front or 

 hinder end of the segments. The cau- 

 dal horn is now yellowish ; the subdor- 

 sal yellowish lines ending on it ; it is 

 about one-half as long as the Sth seg- 

 ment is wide when seen from above, 

 and is finely tuberculated with dull 

 amber-colored warts. The uj^per side 

 of the body is yellowish-green, but the 

 under side is almost exactly of the hue 

 of the under side of the leaf of Ampe- 

 lo2Dsis, being of a rich soft pea-green 

 and less distinctly and prominently 

 papillated than above. The thoracic 

 legs are 3'ello wish-green. 



27 or 2S July it began to contract in 

 length in preparation for pupation, and 

 it assumed the pupa state 30 Juh'. 



Duration of stage I, about 7 days ; of 

 stage II, 5 to 6 days ; of stage III, 3 to 

 6 days ; of stage IV, 6 to 7 days ; of 

 stage V and last, about 6 davs ; of the 

 prepupal stage from 2 to 3 davs. Total 

 duration of larval life, about 33 davs. 



Sumwai-y of the most hnportant 

 changes. 



1 . The glandular bulbous body-hairs 

 disappear after stage I. 



2. The caudal horn is at the time of 

 hatching slightly longer than the body. 



3. Faint traces of the yellowish 

 lateral line appear at the close of stage 

 I, but no oblique stripes. 



4. Traces of the oblique yellow 

 stripes appear at the end of stage II. 



5. In stage III the body begins to 

 be swollen on the three thoracic and the 

 I St abdominal sesrments. All the distinc- 



