MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 139 



spines; second and tliird tlioracie sco-nicnts each with eiojit s])in(>s, the dorsal tuherclos alik(^ in 

 shayjc and size, hiijii but l)liint at the end (h^igth 5 mm; that of (.'. rct/al/.s 1() mm.), as thiclv at 

 tiie end as iit the l)ase. not tapering- to a sharp point, as in (.'. regalls. The supraspiracidar spineS 

 about half as lon^' but (|uite as thick at the base as the doi-sal ones; the two lowiu'inost spines Hat 

 and short. 



All the alxioniinal dorsal spines of t!u> same size and lu^irly of the same shape, with the same 

 number (.")) of teeth on spinules. On abdominal seginents 1-7, those without legs (1, 2, and 7), 

 there are eight black spines; on those segments with legs (3 to 6) the lowest spine is wanting. 

 On segments 8 and ii there are four spines on each side of the median dorsal one. That on the 

 eiiihth abdominal segment is large and thicdv, -i nun. in length and slightly l)ut uueverdy ))itid at 

 the tip. That on the ninth segment is umch thicker and about one-quarter longer than the others 

 on the same segment, and ends in two diverging short spines, more distinctly bifid than the 

 median spine on the eighth segment. 



Suranal plate long and narrow, rugose; black; a lateral stout i-tootlied spine or tubercle on 

 each side near the middle of the plate; the edge is armed with spines as long as those of C. sejyul- 

 cnilis. Body })lackish: the pleural ridge yellowish. In this form the number of dorsal thoracic 

 spines is 10, as in C. ri-ydllx^ but the_v are remarkably short and thick and )>Iunt at the end. 



I am indebted to Dr. Dyar for the opportunity of examining this very rare larva, a poorly 

 preserved blown example in the U. S. National Museum. For the details of the armature see 

 PL LV, figs. 1, hi, Ih. 



From C. laocoon (i.vion) larva it differs in the shorter spines, the spinules being remarkably 

 large and swollen: also in the eciuality in size of the dorsal spines on the second and third thoracic 

 segments, while the eighth abdominal median spine (caudal horn) is nearly twice as thick. 



CITHERONIj^ J^ZTECA. (Diuce). 



PI. XVIII, tig. Sj$. 



Eacles aziera Drcce, Biol. Centr. Amer. Lep. Het. II. p. AV.i; Tab. SO, fig. 1, Sept. 1897. 



I/narfo.^1 S . This form is very near C. regal is, but differs in the fore wings being shai'per 

 at the apex; the outer edge a little more oblique; apex of the hind wing more produced, and 

 not so much rounded. The fore wings are of the same color and the markings are identical, but 

 the hind wings are moreyellowish; not only the costal and iiuier edge, but the outer edge is 

 yellow. There is a distinct, though very diffuse, dark gray extradiscal baud, bej'oud which the 

 wing out to the outer edge is j'ellow. 



Under side of the wings cream-white, not so ocherous as in ('. regal is. The spots of the 

 extradiscal series are separate. Hind wings as in C. regalis, but cream-white; the markings are 

 the same. There are in my single i no yellow thoracic lines, but they are present in the $ 

 figured by Mr. Druce. 



Expanse of the fore wings. $ 12(imm.: length of a single fore wing, S 55 mm.; breadth 

 of a single fore wing, S 23 mm.; length of a hind wing, S 33 nun.; breadth of a hind wing S 



Q 



o nun. 



This species differs from C. splendens, to which it is closely allied, in the outer margin of 

 the hind wings being ocherous. The two species maj' prove to be the same when reared from the 

 larva?. The markings of the fore wings are identical. In my single male, the thorax is almost 

 entirely brick red, without the yellowish white stripes of 6'. splendenti. 

 Geographical disti'ibutiiDi. — Jalapa (Barrett); Orizaba (Druce). 



