PACKARD. — TRANSFORMATIONS OF SATURNIAN MOTHS. 555 



Rothschildia Orizaba. 



Larva. — Stage I. Hatched July 8-9. Described July 12, 1902. 



Length 8-10 mm. Body cylindrical, rather slender, slightly more so 

 than in T. luna. Segments not convex, more as in Callosamia than in 

 Telea or Tropaea. Head rather small, rounded, much as in Callosamia, 

 a little more than half as wide as the body in its thickest part ; pale 

 whitish, surface very finely granulated ; edge of clypeus dark brown, 

 and a transverse line across the front edge ; a large brown round spot 

 on each side. 



Prothoracic segment with no definite plate, but with six long slender 

 high greenish-yellow tubercles, about one-third as thick at base behind; 

 six setae in each dorsal tubercle ; the longer setae about twice as long 

 as the tubercles. All the tubercles on the second thoracic segment to 

 the end of the body much swollen at base, being conical, large, and 

 pale straw-yellow, and all of the same size and height, but those of the 

 2d and 3d thoracic segments are fused together at their base, while those 

 of the abdominal segments are distinctly separate. 



The median tubercle of the 8th abdominal segment is only a little 

 larger and a little broader than those on the 9th segment ; those on 9th 

 abdominal segment fused at base. 



Body above black, except the thoracic segments, which are greenish, 

 with two black spots on each segment above ; the sutures livid greenish. 



Suranal plate with two large, slender, distinct tubercles, about one- 

 half as large as the supraspiracular one on the 9th segment; it is green- 

 ish yellow, but behind the tubercles dusky. Anal legs blackish in the 

 middle. Infraspiracular row of tubercles arising from the lateral ridge 

 pale greenish-livid, as is the under side of the body and the abdominal 

 le^s. Thoracic less black. 



Each tubercle with six dusky setae, the longer ones a little longer 

 than the tubercle itself. 



A very beautiful caterpillar, which resembles that of Callosamia in 

 coloration, but the tubercles are larger, conical, and all alike in size. 



Larva. — Last stage. Head rounded, about one-half as wide as the 

 body is thick, and not so wide as the cervical plate ; the surface of the 

 head smooth, polished, with scattered fine hairs on the clypeal region 

 and about the ocelli ; in color pea-green. Body thick, cylindrical, taper- 

 ing a little towards each end ; how convex the segments are cannot 

 be determined in blown examples. Cervical plate smooth, with do 

 vestiges of tubercles. On the prothoracic segment below the edge of 



