138 MEMOIKS OF THE NATIONAL ACADEMY OF SCIENCES. 



CIXH:ii;RO>fI^V MEXICA.:N'^ Grote ana Robinson. 

 PI. XVIII, fig. 4, 3. 



atheroma mf.i)>ann Grote and KoBix.^ox, Annals Lyceiuii Nat. Hif^t. \. Y., VIII, p. ?,i, PI. xin, fig. 1, Oct., 



1866. 

 Eades mccicana Drite, Biol. Ceutr. Amer. Lep. Het., I, p. 169; Tali. XV, fig. 11, $ , June, 1866. 

 Citheronia me.riaiiia Kiuhy, Syn. Cat. Lep. Het., I, p. 743. 1892. 



Imago. — 1 $. Compared with C. regalis S it is smaller than an}' 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. vegalis. The fore wings are darker, of a peculiar dull almost pur- 

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

 arrangement and size as in C regalis., but more reddish. It differs decidedh- from C. regal is, 

 and in this respect resembles C. phoronea and nraa, in having a submarginal brick-red zigzag 

 line, with some yellow 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. regalln, 

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



C. ine,clcana 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. 



PujM. — "Scarcely distinguishable from that of C. regalis, except that it is much smoother 

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

 segments. The cremaster is also smooth at its tips." (H. Edwards, Ent. Amer., IV, p. 62.) 



Geographical (lisfrihiitlnn. — Orizaba, Coatepec, Mexico; City of Guatemala, Vulcan de 

 Chiriqui, Panama (I)rucc). 



PI. XVIII, fig. 2 ,?, 2a 9 ; larva, PI. XV, fig. 1. 



Eadei< ■'•■pleinlcnK Dkvce, Biologia Centr. Amer. Lep. Het., I, p. 169, PI. xv, fig. 12, June, 1886. 

 Cilheronia sjdeiKleii.i Kirhv, Syn. Cat. Lep. Het., I, p. 742. 1892. 



Druce states that this species is closely allied to C regal i.^, 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 al.so in the general grayer color of the wings of both pairs. 



Tiiat it is (juite distinct from C. rrgalis is proved by the difference in the larvre of the two 

 species. 



Geographical di^itrihitt ion .—(}\\\UYa.g\\?ito, Mexico (Boucard, Druce). 



Larva. — Stiige before the last. Length, 62 mm.; width of head, <; nmi. (that of V. regalis 

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

 the prothoracic plate; dark chestnut, and differing from C. regalis of the same stage not only in 

 the ground color being darker, Init 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 pale median line, and another above each spiracle; armed with a 

 dorsal pair of largir high spines about two-thirds as long and thick as tho.se of the second thoracic 

 segment (4 nun. in length), broad and blunt a-t the end, not terminating in a sharp point, as in 

 C. 7'egaliK or in a bidb as in C. laocoon; the}' are black, j'ellowish at the base, and bear about 

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

 tul>eicles are not one-half as long as those of the dor.sal pair. . The one directly in front of each 

 spiracle is a little shortei', but that at the I'ase of each leg is stoutci- and largei', ending in ffve 



