138 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



CITHERO:sri^ jNIEXIC^N^ Griote and Robinson. 

 ^ PI. XVIir, fig. 4, s. 



atheroma mexicana GnoTE and Robinson, Annals Lyi'eum Nat. Hist. N. Y., VIII, p. 32, PI. .vm, fig. 1, Oct., 



1866. 

 Eades mexicana Dkuce, Biol. Centr. Anier. Lep. Het., I, p. 169; Tab. XV, fig. 11, S , June, 1866. 

 Citheronia mexicana Kirby, Syn. Cat. Lep. Het., I, p. 743. 1892. 



Imago. — 1 S . Compared with C. recjcdh S it is smaller than any I have seen. Like that 

 species the number of pairs of fully developed antennal pectinations is 17-18. The fore wings 

 are slightly more acute at the tip, and the hind wings decidedly more triangular, the apex being 

 much less rounded than in C. regalis. The fore wings are darker, of a peculiar dull almost pur- 

 plish gray, a little duller than in C. splendens and C. azteca. The yellow spots are the, same in 

 arrangement and size as in C. regalis., but more reddish. It differs decidedly from C. regahs, 

 and in this respect resembles C. j^uironea and «/'««, in having a submarginal brick-red zigzag 

 line, with some j'ellow in it, which runs parallel with the outer edge of the wing. The hind 

 wings are colored and marked as in C. regalis. The wings beneath are much as in C. regalis., 

 except that the submarginal zigzag line is present. The thorax and abdomen are as in C. regalis. 



O. mexicana entirely differs from C splendens and C. azteca in the spots on the fore wings 

 being reddish ocherous instead of ocherous white, and in having a submarginal line on the fore 

 wings. 



The tongue is well developed, fully as much so as in C. regalis. 



Expanse of the fore wings, 90 mm. ( 9 according to Grote, 5.80 inches); length of one fore 

 wing, 46 mm.; breadth of one fore wing, 20 mm.; length of one hind wing, 28 mm.; breadth of 

 one hind wing, 20 mm. 



Pupa. — "Scarcely distinguishable from that of C regalis, except that it is nmih smoother 

 and the spinules much larger in size. They are also raised considerably above the surface of the 

 segments. The crema.ster is also smooth at its tips." (H. Edwards, Ent. Amer., IV, p. 02.) 



Geographical t/istrihiifion. — Orizaba, Coatepec, Mexico; City of Guatemala, Vulcan de 

 Chiriqui, Panama (Druce). 



• CITHE:R0N^I^\. SPLKTsTTDENS (i:>iuce). 



PI. XVIII, fig. 2 S, -" 9; larva, PI. XV, fig. 1. 



Eades splendens Druce, Biologia Centr. Amer. Lep. Het., I, p. 169, PI. x\-, fig. 12, June, 1886. 

 Citheronia splendens Kirby, Syn. Cat. Lep. Het., I, p. 742. 1892. 



Druce states that this species is closely allied to C regalis, from which it differs in the 

 entirely different coloration of the hind wings, in having the thorax striped and the yellow marks 

 at the base entirely absent, and also in the general grayer color of the wings of both pairs. 



That it is quite distinct from C. regalis is proved by the difference in the larva; of the two 

 species. 



Geographical distrihafion. — Guanagiiato, Mexico (Boucard, Druce). 



Larva. — Stage before the last. Length. (!2nim.; width of head, (I mm. (that of C. regalis 

 in same stage, 7 mm.). Tiie head of the usual shape, being rather flattened in front; as wide as 

 the prothoracic plate; dark ciiestniit. and difl'ering from ('. regalis of the same stage not only in 

 the ground color being darker, l)ut in the front being black on each side of the clypeal region, 

 while the center of the clypeus-posterior is black.^ Prothoracic plate rugose, light colored, with 

 a black band on each side of a pal(> median line, and another above each spiracle; armed witii a 

 dorsal pair of large high spines about two-thirds as long and thick as tliose of the second thoracic 

 segment (1 mm. in length), broad and blunt at the end, not terminating in a sharj> point, as in 

 C. regalis or in a bidb as in I'.htoeixin; they are Itlack. yellowish at the base, and l)car about 

 10 to 12 large swollen blunt tuberculets, each ending in a short, stout seta. The supraspiracular 

 tubercles are not one-half as long as those of the dorsal i)air. The one directly in front of each 

 spiracle is a little shorter, but that at the base of each leg is stouter and larger, ending in five 



