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MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



Vol. XII, 



second and third thoracic segments a little (about one-fourth) larger than those on abdominal 

 segments 1-7 ; those on the latter-named segments slightly larger than those on the intermediate 

 segments, all bearing six radiating and a central erect black seta; the tubercles are pale green 

 (in the blown larvae examined they have turned yellowish like the dorsal ones). 



The median tubercle on the eighth abdominal segment of the same size as those of the dorsal 

 on the second thoracic segment; it shows a slight bilateral arrangement, there being six black 

 setae on each side. 



Suranal plate and each of the anal legs with a pale bright Ted spot as in the last stage. 

 Spiracles black; legs as described in the last stage. 



The larva in this stage differs from the full-grown caterpillar in the larger tubercles, all of 

 which are armed with well-developed spine-like setae; in the nine (one more than in the last 

 stage) yellow bands, there being an additional one on the second throacic segment, the bands 

 or incomplete rings beginning at the infraspicular row of tubercles and passing over the back 

 from one side to the other. 



Last stage: Length of body 110 mm,; width of head 4£ mm. Body cylindrical. Head 

 small rounded green, smooth, less than one-half as wide as the prothoracic segment; the clypeus 



narrowly edged with 

 black, and two diverging 

 black lines extending from 

 near the center of the ver- 

 tex and passing down in- 

 side of the ocelli. 



Prothoracic segment 

 with no traces of dorsal 

 tubercles, but a green 

 pyriform tubercle in front 

 of and a little below the 

 spiracle, and a larger, 

 more prominent one, still 

 lower down, bearing six 

 short setse, five around 

 the edge of the crown and 

 one in the center. 



Dorsal tubercles 

 small pyriform, present 

 on the second and third thoracic segments; those on the first abdominal segment about a third 

 smaller than the thoracic ones, and with no setas. On abdominal segments 2-7 the dorsal 

 tubercles decrease in size to the seventh. The median tubercle on the eighth abdominal seg- 

 ment dark green, fully as large as the thoracic ones, and bearing five distinct peripheral and 

 central one black seta (their stumps being present, probably broken off while being inflated; 

 they are faintly seen in the penultimate stage.) Tubercles of the supraspiracular row minute, 

 smaller than the dorsal ones; those of the infraspiracular row larger, and still armed with 7—8 

 black setae. It differs from the larva of R. orizaba from Mexico in having no definite hairy 

 lateral yellow ridge. 



Suranal plate small, rounded behind, with a few small fine hairs and bearing a large central 

 bright red rugose spot; the lower edge yellow; on the sides of the anal legs a little larger tri- 

 angular spot of the same color. Spiracles black, very conspicuous. Segments smooth, and 

 with a pale yellowish band or incomplete ring (eight in all) in front of each spiracle. 



Thoracic legs pale, black at the end, first and the third joint entirely black. Midabdominal 

 legs green, a yellow patch above the planta, broadly bordered with black, and the planta 

 black. 



Described, as are the other stages, from blown specimens. 



Fig. 33. — Rothschildia jaeobxx. Larval tubercles. 1. Stage II, suranal plate. 2-6. Stage III; 2, pro- 

 thoracic plate, two tubercles on one side; 3, from second segment; 4, from third thoracic; 5, from first 

 abdominal segment; 6, from eighth abdominal. 7-10. StagelV; 7, from second thoracic segment; 8, 

 from third; 9, fromfirst abdominal; 10, from eighth abdominal. 11-14. Last stage; 11, from second 

 thoracic; 12, third thoracic; 13, first abdominal; and 14, eighth. 



