no. i. BOMBYCINE MOTHS OF NORTH AMERICA— PACKARD. 37 



Markings: Olive or ashen fawn color, with similar large ocelli on each pair of wings (tyr- 

 rhaea), inclined to be oval, those of the hind wings nearly round. On the underside they are 

 much smaller, especially those of the hind wings. The basal line on the fore wings is very 

 deeply zigzag, the extradiscal line is composed of large, coarse scallops on both wings, and 

 the ground color tends to be blackish brown. Fore tibial odoriferous sack concealed by the 

 tibial hairs, but when denuded found to be large and five-sixths as large as the tibia itself and 

 nearly as thick. The two fore tibial spines much shorter than in belina. This genus has been 

 confused with Antheraea, but structurally is near Acanthocampa, Gynanisa, and Nudaurelia. 

 The genus differs from Nudaurelia in the plumose antennae, the pectinations being slender, 

 long and densely ciliated, in venation as vein II t arises close to the stalk of II 2 and II 3 , while 

 in Nudaurelia dione IL arises much nearer the base of the wing, far inside of the ocellus. Also, 

 Nudaurelia has subfalcate fore wings, the ocelli are more advanced or specialized, and the 

 head is broader in front. 



Geographical distribution. — An Ethiopian genus (Natal). 



Genitalia: Suranal plate triangular, moderately wide; as in Gynanisa and Acanthocampa 

 belina, no lower claspers are present. The upper pair well developed, much as in the type of 

 Acanthocampa belina and Gynanisa isis, being seen sideways broad, triangular, ending in a 

 mucronate process; seen from above and beneath, a clasper is about one-third as wide as long. 



THYELLA TYRRHiEA (Cramer). 



Plate XXXII, fig. 2; XXXV, fig. 3; CVIII, figs. e-h. 



[AUacus tyrrhaea Cramer, Pap. Exot., I (1775), pi. 46 A.] 



Imago. — One <? . Ground color of the body and wings olive fawn-brown. Fore wings 

 with a distinct white basal line with two sharp angles, a small one with the apex in the discal 

 cell, the other a large acute angle ending in the middle of the wing between the ocellus and 

 the inner edge. From the costal ending of the line a narrow white line passes to the ocellus 

 and becomes confluent with it. An outer very regularly scalloped heavy dark brown line 

 consisting of seven scallops, all of the same shape, the largest being toward the inner edge 

 of the wing; the scallops are edged within with white, and very broadly so with white on the 

 outside, the outer edge of the white line being even. Outer edge of the wing colored like the 

 rest of the wing, ocellus centered with a roundish clear spot in a central pale sable-brown area, 

 inclosed by a black ring; then a pale sable-brown ring, outside of which is a white line, which 

 behind widens out and sends a line to the basal line and in front of the ocellus. 



Hind wings pink at the base, otherwise colored as in the fore wings; outer line with shallower 

 scallops, and less white outside than on the fore wings. Ocellus as in the fore wings, but larger 

 and rounder. 



Under side of the wings with pink along the hinder part of the base of the wings, extending 

 to the extradiscal line and to near the costal edge. Ocellus nearly as large as above. Hind 

 wings with more gray scales than above; the ocellus one-half as large as above, and only the 

 snuff yellow center left, and an outer black ring. 



Expanse of the fore wings, s 114 mm. 



Length of a fore wing, <? 57 mm. 



Breadth of a fore wing, S 32 mm. 



Length of hind wing, & 44 mm. 



Breadth of hind wing, S 32 mm. 



Ocellus of fore wing, \\\ by S mm. 



Ocellus of hind wing, 13 by 10 mm. 

 [Geographical distribution. — South Africa.] 



ACANTHOCAMPA Packard. 



[Acanthocampa Packard, Journ. N. Y. Ent. Soc, X (1902), p. 100.] 



