254 MEMOIRS NATIONAL ACADEMY OF SCIENCES. vol. xn, 



below the edge of the cervical plate is a slight vestige of a tubercle in front of but a little below 

 the spiracle; farther down, near the base of the leg, is a decided but small low tubercle bearing 

 three setiferous spinules; those in the same relative position on the second and third thoracic 

 segments are of the same size and shape. 



On each of the two hinder thoracic segments there are four small dorsal tubercles in a 

 transverse row. Each tubercle is crowned by a ring of five to six spines, with one in the center. 

 These and the dorsal ones on abdominal segments 1-7 are so closely alike in size and armature 

 that it is difficult to see any difference in size between the thoracic and abdominal dorsal ones. 

 The four dorsal ones on each of the two last thoracic and the first seven abdominal segments 

 are alike in size, number, and arrangement of the spinules; there not being the usual distinc- 

 tion which obtains in the Attacinse (Samia, Callosamia, Telea, etc.) between the submedian 

 (dorsal) and supraspiracular series. Those of the seventh abdominal segment are, as far as I 

 can see, just like those on the second and third thoracic and first abdominal segments. 



The median spine on the eighth abdominal segment is scarcely higher (longer), but is about 

 one-quarter thicker than the one on each side; it is slightly broader than long (seen in section 

 from above) and bears five spinules on each side of the median line. There is no infraspiracular 

 row of tubercles (such as are present in the Citheroniinas and Attacinae). There also seems to 

 be no difference in color between any of the tubercles. 



The suranal plate is green, a little rough on the surface, and there are traces along the hinder 

 edge of piliferous spines; the plate is edged with black. The anal legs are large, green, the 

 triangular area edged with black, and on the edge are scattered small black piliferous warts. 

 The thoracic legs are pea-green; the abdominal legs green, with irregular rows of black warts 

 bearing white hairs above the plantae, which are, with the hooks, black. Along the side of the 

 body extends a broad lateral yellow infraspiracular line, from which and below which arise long 

 fine white hairs. The spiracles are sienna brown-yellow. The body is covered with fine white 

 short clavate hairs. Length 80 mm. 



An inflated example from Mexico in the United States National Museum, collection of Dr. 

 H. G. Dyar; two inflated examples, in bad condition, from Tacubaya, Mexico (Barrett). 



In the species of this genus the degree of specialization of the tubercles in the larva is very 

 slight, as they show a tendency to reduction and atrophy, which reaches its greatest perfection 

 in R. betis, in which there are, according to Burmeister's figure and description, no tubercles at 

 all, while the body is blackish, with conspicuous transverse bands. 



R. orizaba, as a larva, in form and markings most nearly approaches that of R. aurota, 

 while the most generalized species is R. speculijer, in whose larva there are the longest tubercles, 

 most nearly approximating those of Samia and Philosamia. 



Food plant. — Specimens raised from the egg by Mr. Joutel fed on the white ash. Its 

 native food plant is unknown to us. 



[The following account of the larva of R. orizaba has been kindly sent by Miss Soule. 



After third molt. — Head, legs, and prolegs green with black marks. Body very green with 

 almost orange tubercles; that on the dorsum of eleventh segment the largest, those on the 

 dorsum of second and third segments being next in size. Anal plate had a black V and two 

 pale yellow tubercles. The canary-yellow substigmatal "edge" was heavily fringed with white 

 hairs, as were the venter of the thoracic segments and the subventral region. This "edge," 

 almost a ridge, grew pink in color. The spiracles were of just the color of the dorsal tubercles. 



The next stage was like this one intensified, and the larvae grew to a length of 4 inches, 

 measuring 2J inches around the largest part of the body. — Caroline G. Soule.] 



ROTHSCHILDIA JORULLA (Westwood). 



Plates IV, figs. 4, 5; V, figs. 1, 2; LVII, figs. 1, 2; LXX, fig. 4. 



{From Descriptions of some New Species of Exotic Motha belonging or allied to the Genus Saturnia. By J. O. West- 

 wood. Proc. Zool. Soc. London, 1853, pt. 21, p. 159.) 



"Saturnia Jorulla, Westw. S. alis f ulvo-fuscis ; anticis macula subtriangulari, posticis 

 macula subovali, vitreis albo nigroque marginatis, striga angulata e basi ad costam anticarum, 



