1893.] l-Ot> [Packard. 



four dorsal and one subdorsal ; of the four dorsal the inner two are about 

 as long as the body is thick, and sharp at the end, with long spinules ; the 

 two adjoining spines are minute. The four spines on the second thoracic 

 segment are much larger, the outer ones on the second and third thoracic 

 of nearly the same size, but the inner two on the third thoracic segment 

 are a little longer than those on the second. 



The spines on abdominal segments 1-8 are of even size, and armed with 

 long spinules ; they are about two-thirds as long as the body is thick, and 

 end in two long diverging spinules. On the eighth segment, arising 

 from a large, fleshy base, is a much spinulated caudal spine, nearly half as 

 long as the large thoracic ones ; it is mostly black, but flesh-colored in 

 the middle. Behind it, on the ninth segment, is a median dorsal horn, 

 about one-third as large as that on the eighth. 



The suranal plate is small, rough, bearing two large spines ; the end is 

 rounded, with two minute spines between the last pair of lateral spines ; 

 the anterior two of the spines on this plate are larger, but simpler than 

 those on the ninth abdominal segment, and end in four spreading spinules, 

 the main stem being nearly smooth. 



The prothoraclc segment is blackish, reddish dark flesh color in tlie 

 middle ; the second thoracic segment is of nearly the same color, but the 

 third is entirely black. The stigmata are black, surrounded by a blackish 

 cloud, while in front is a velvety black oblique dash, and beneath a flesh- 

 colored oblique raised ridge or fold. All the legs, both thoracic and ab- 

 dominal, are black ; the anal pair are large, rough and black. There is a 

 large spine under each spiracle. 



Stage III. — Length, 30-35 mm. Molted on the morning (9 a.m.) of 

 October 10. When first seen the color of the body was uniformly pur- 

 plish flesh color, with black markings. The head (width, 4 mm.) is dark 

 chestnut brown, with the clypeus and adjoining parts pale. It differs 

 from the preceding stage in the considerably shorter abdominal spines, while 

 their spinules are somewhat larger in proportion than in the previous stage. 

 The thoracic spines are about, or a little more than, twice as long as the 

 body is thick, and the abdominal spines are about one-third as long as the 

 body is thick. The lateral oblique fleshy fold on the abdominal segments 

 have a more distinct dark dash above than in the preceding stage. The legs 

 are black. The caudal spine is now about one-third as long as the larger 

 thoracic ones, being in the former stage about, not quite, one-half as long 

 as the longer thoracic spines. 



By 2 P.M., October 10, the thoracic and caudal spines, at first pale flesh 

 color, became black, and the head and thorax, as well as the body gener- 

 ally, had turned darker. 



It assumes, like E. imperialis and 8. bicolor, a Sphinx-like attitude, so 

 that this feature is possibly inherited by the Sphlngidae from the Cerato- 

 campidse or a similar group. The thoracic and caudal spines are some- 

 what sensitive to touch by an intruder. 

 Last Stage. — I will first describe an alcoholic specimen, 45-50 mm. in 



