MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 139 



spines; second and third thoracic segnients each with eight spines, the dorsal tubercles alike in 

 shape and size, high but blunt at the end (length 5 mm; tiiat of V. regtdis 16 mm.), as thick at 

 the end as at the base, not tapering to a sharp point, as in C. reijalh. The supraspiracular spines 

 al)out half as long but (juite as thick at tlio l)ase as the dorsal ones; the two lowermost spines flat 

 and short. 



All the al)dominal dorsal spines of the same size and nearly of the same shape, with the same 

 number (.")) of teeth on spinules. On abdominal segments 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 S and 9 there are four spines on each side of the median dorsal one. That on the 

 eighth abdominal segment is large and thick, -4 mm. in length and slightly but unevenlv bitid at 

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

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

 median spine on the eightli segment. 



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

 each side near the middle of the plate; the edge is armed with spines as long as those of C. se]>nl- 

 cralis. Body blackish; the pleural ridge yellowish. In this form the number of dorsal thoracic 

 spines is 10, as in V. ret/a/is, but they are remai'kably short and thick and blunt 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 

 PI. LV, figs. 1, la, 1/^ 



From C. laoami {Lriou) larva it ditl'crs in the shorter spines, the spinules l)eing remarkal)lv 

 large and swollen; also in the equality 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. 



CITHEKONIA A.ZTEC;'A. (Di-uce). 



PI. XVIII, fig. 3;,?. 



Eaclea azteca Druce, Biol. Centr. Amer. Lej). Het. II. p. 413; Tab. SO, fig. 1, Sept. 1897. 



Imago. — 1 S . This form is very near O. regal In, but differs in the fore wings being sharper 

 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 more yellowish; not only the costal and imier edge, ))ut the outer edge is 

 yellow. There is a distinct, though very difluse, dark gray extradiscal band, beyond which the 

 wing out to the outer edge is yellow. 



Under side of the wings cream-white, not so ocherous as in C. rcga/i.f. The spots of the 

 extradiscal series are separate. Hind wings as in C. regali^i. but cream-white; the markings are 

 the same. There arc in my single S no yellow thoracic lines, but they ai'e present in the 9 

 figured by jNIr. Druce. 



Expanse of the fore wings. S 120 nmi.: 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 mm.; breadth of a hind wing S 

 25 mm. 



This species dift'ers from C. ftplendms, to which it is closely allied, in the outer margin of 

 the hind wings being ocherous. The two species may prove to l)e 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 C. splendcns. 



Geographical distrihuflnn. — Jalapa (Barrett); Orizaba (Druce). 



