8 MEMOIRS NATIONAL ACADEMY OF SCIENCES. vol. xii, 



spots at the nervules. On the hind wings at the apex of cell is a small brown ring with a central 

 spot. 



"Expanse, S.5 inches = 21 5 mm. 



"Hab. Chuchuras, East Peru. (In coll. Staudinger.)" 



ARSENURA RICHARDSONI Druce. 



Arsenura richardsoni Druce, Biologia Centrali-amer., Lep. Het., Ill, plate 83, fig. 1; Ann. Mag. Nat. Hist., (6) V, p. 



215, 1890. 

 Arsenura richardsoni Kirby, Syn. Cat. Lep. Het., I, p. 770, 1892. 



Imago. — 1 <? . Fore wings more falcate, with the apex more produced, and hind wings 

 much more angulated (almost tailed) than in d 1 A. armida. Antennas of 6 as in S A. armida, 

 the pectinations being short, vestigial, and much ciliated. Head in front a little narrower than 

 in A. armida, and the palpi larger and longer, more prominent. Body of the same size as in 

 A. armida. 



Fore wings more falcate, being decidedly so, than in A. armida, arcaei, pandora, and xan- 

 thopus, but not so much so as in A. championi. Costa a little more arched; apex more pro- 

 duced and outer edge more deeply excavated than any species except A. championi. 



Hind wings with the apex rounded, the middle of the outer edge produced into a decided 

 angle or point on the independent vein. 



The ground color darker Vandyke or deep chestnut brown than in A. armida and pandora. 

 The markings are much less distinct than in the other species. The fore wings with an obscure 

 basal dark line or shade. Discal spot distinct, roundish lunate, in the middle paler, forming 

 a linear pale streak, sending a short streak along the base of the independent vein. Halfway 

 between the discal spot and submarginal line is a broad dusky extradiscal shade; between it 

 and the submarginal 6-scalloped line the wing is dark chestnut brown. Outer edge of the 

 wing beyond the line is darker than in the other species named. A large suboval black costo- 

 apical spot slightly edged with pale blue scales; this spot is much larger than in A. armida; no 

 pale red patch beyond the costo-apical spot, but behind it three or four deep madder-red slashes. 

 Hind wings marked like the fore wings, but no trace of a discal spot. Three dark excurved 

 parallel shades; the outer margin as on the fore wings, with two madder-red spots, one at the 

 base of the tail. 



Underside of the wings uniformly dark fawn brown, with scattered darker spots; no discal 

 spots. Two broad very diffuse dark brown shades, while the outer third of the wings of both 

 pairs is hoary, though the outer edge is free from the whitish scales. 

 Expanse of the fore wings, o* 125 mm. 

 Length of a fore wing, o* 68 mm. 

 Breadth of a fore wing, 3 37 mm. 

 Length of a hind wing, <? 57 mm. 

 Breadth of a hind wing, <? 40 mm. 



Geographical distribution. — Eastern Mexico (Doll) (Druce). 



The eggs of this rare species were kindly sent me from Tacubaja, Mexico, by Mr. O. W. 

 Barrett. The food-plant of the caterpillar was unknown to him. 



Stage I. — Length, 4 mm. Head large and round, wider than the body, and shaped as in 

 Adelocephala. The body is rather thick, and tapers somewhat to the end. The first thoracic 

 segment is rather wide, but not so wide as the head; the front edge is somewhat raised, i. e., 

 flares up, and bears a remarkably complex armature. The two dorsal tubercles are broad, thin 

 (in a fore-and-aft sense), and divided into seven heads or subtubercles, one or two of which are 

 smaller and shorter than the others, each digitiform tuberculet bearing a long spinulate black 

 seta; the setae are of nearly equal length, and nearly as long as the entire main or master tubercle. 

 As compared with those of Eacles imperialis, stage I, these tubercles are much thinner, and are 

 7-headed instead of being 2-headed, i. e., simply forked. 



Below on the front edge of each side is a smaller tubercle of the subdorsal series about one- 

 third as long and large as those of the dorsal pair, ending in three subtubercles, each of which 



