140 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



PI. XIX, tig. 8 9. 



Eacles principalis Walker, Cat. Lep. Het. Br. Mus., VI, No. 8, p. 1376. 18.55. 

 Ceratocampa principalis Boisduv.^l, Antiales Sop. Ent. France (4), VIII, p. 316. 1868. 

 Citheronia principalis K.iRB'^ , Syn. Cat. Lep. Het., I, p. 742. 1892. 



Larva. 



PI. XVII, tig. 4. 



Boisduval, J. A., Annales Soc. Ent. France (4), VIII, p. 317. 1868. 



Burmeister, Descr. Rep. Argentine, Lep., Atlas, PI. xx, fig. 4. Pupa, fig. 6. 1879. 



Iumgo. — 1 9 • Thorax, abdomen, and wing.s tawny or reddish orange-brown; tufts at the 

 base of the antenna^ and two on top of the nietathorax, ocher in color, as also two yellow spots 

 at the base of the fore wings, one on the costal edge and the other at the base of the cubitu.s 

 (Vein IV). Fore wings with the basal line distinct, situated much nearer the di.scal mark than the 

 base of the wing; it is dislocated on the cubitus or median vein, where it makes a right angle, and 

 extends to the costa, being parallel with the costal mark; it is brown, shaded diffusely within with 

 gray. Di.scal mark a long, nari'ow, straight streak, gray, within edged with dark brown. A 

 distinct oblique, firm, not wavy, extradiscal line extending from the outer third of the inner 

 edge to the outer sixth of the costal edge; it is brown, edged externally' with gray. On the 

 inside of the line is a row of rive roundi.sh spots; the two nearest the costa obscure deep orange; 

 the two next in the extradiscal cell and the other in the cell behind are hyaline, with a few 

 yellow scales scattered over the surface and on the edges; the anterior one is roundish, the other 

 triangular; the anterior spot is about halfway between the discal mark and the outer edge. 

 Between the extradiscal line and the outer edge of the wing are two alternating rows of deep 

 orange-red irregular blotches. Fringe of both wings reddisli brown. 



Hind wings like the anterior ones in color and marking, with no yellow, basal and extradiscal 

 lines as on fore wings, discal mark as on fore wings, and the two alternating rows of orange spots 

 are present. 



Under side of wings paler, reddish brown; no distinct discal marks on the wings of either 

 pair; basal line wanting, but the extradiscal forming a brown sharle. The five spots within it 

 nearly as above, including t.wo hyaline spots. The submarginal alternating rows of spots are 

 represented by a very irregular, zigzag brown line, edged within with dull yellow ocher on both 

 pairs of wings. For the venation see PI. LVIII, figs. 3, 3«. 



Expanse of the fore wings, 9 114 mm.; length of one fore wing, 9 62 mm.; breadth of one 

 fore wing, 9 31mm.; length of hind wing, 9 -lljmm.; breadth of hind wing, 9 30 mm. 



This is a large species with the fore wings narrower, more elongated, and pointed at the 

 apex thar in C. phoronea var. There are no yellow spots on the wings; the hind wings are more 

 produced toward the apex. My specimen was compared with Walker's type in the British 

 Museum,, exactly- agreeing with it. 



E<i(h — The eggs taken from the abdomen of a dried 9 ai"e of the same shape, the shell 

 similar, with apparently the same style of sculpturing as that of C. regaVi^t. The egg only 

 differ.': in its smaller size. Length. 2.4 nun.; breadth, 2 mm. 



Larrii. — Fig. 4. Armed with six rows of spines, of which four on the second and third seg- 

 ments are much longer than the others and curved backward; that on the eighth abdominal 

 segment longer than the others, and like a (jueue. The prothoraeic segment with six spines, of 

 which the median two are half longer than the others (Boisduval). 



Judging by l')urnieister"s figure, it differs from the larva of ('. jihoninut in the four dorsal 

 thoracic spines being shorter, more pointed, while the dorsal and other abdominal spines are 

 longer than in that species. Moreover, it differs from all the other species in the body being 

 barred oblicjuely, as in .Sphinx larviv, with seven stripes on each side, the upper part of each bar 

 being edged with l)rown. Anal legs and suranal plat(! very spiny. 



