54 MEMOIRS NATIONAL ACADEMY OF SCIENCES. vol. xii, 



"Rainy season brood: o* . Not differing materially from the figure and description of Prof. 

 Westwood. The ground color is a bright yellow, with the darker markings ochraceous rufous. 

 Expanse 6£ inches. 



" 9 . Wings very broad, and not nearly as pointed at apex as in the male. General color 

 tawny ochraceous, with darker markings deep burnt sienna. Expanse of wings 7-7} inches. 



"Dry season brood: The general color of the two sexes is the same, and may be described 

 as mars brown, with the darker markings of a livid purplish cast. 



"Expanse of wings: <? 4f inches; 9 5-5£ inches." 



Geographical distribution. — Old Calabar, West Africa, near mouth of the Niger River, and 

 most of Cameroom; lat. 11° 50'N. (Westwood); Elove, a town 15 miles down the Ogove River 

 from Kangwe, French Congo, a little south of Cape Lopez (Holland). 



GYNANISA Walker. 



Gynanisa Walker, Cat. Lep. Het. Br. Mus., VI, p. 1267, 1855. 

 Gynanisa Kirby, Syn. Cat. Lep. Het., I [p. 763]. 



[The type of the genus is G. maia.] 



Imago. — <? and 9 . Head when denuded seen to be broadly triangular, nearly twice as 

 wide on the vertex as in the labial region; rather broad and square in front. Male antennae 

 broadly pectinated, plumose, tip (broken off in specimen examined), joints shorter than thick; 

 pectinations of both pairs equally long, slender and clothed with long dense cilia; those of 9 

 simple, denticulate, flattened; distal pectinations minute, forming very short teeth. Palpi 

 stout, broad, and long, extending well beyond the front; third joint fairly distinct, slender, not 

 so long as second is broad. Thorax and abdomen stout; the pro thoracic collar fairly distinct. 



Fore wings of <? rather broad, not falcate, costa somewhat curved toward the apex, the 

 outer edge neither excurved, nor convex; apex not acute. Hind wings somewhat produced 

 toward the apex; outer edge of the wings slightly scalloped. Hind wings extending a little 

 beyond the end of the abdomen. 



Venation : Vein II 1 [III t is revised nomenclature] arising a little beyond the middle of 

 the discal cell, II 3 is present. The common stalk of vein II 2 and II 3 and II 4 also arises at 

 the outer fourth of the discal cell far within the discal veins; the two latter in fore and hind wings 

 form a sinuous fine, neither curving outwards, as in Thyella or Salassa, but more as in Nudaurelia 

 cytherea, and these veins are nearer the base of the wing than in Nudaurelia; vein III 2 is less 

 detached from III , than in Nudaurelia. Hind wings much as in Nudaurelia, but discal cell is 

 shorter. 



Markings: Ground color dark fawn brown; fore wings crossed by five fines, the two outer 

 indistinct; an incomplete small triangular black ocellus on the fore wings, containing a large 

 oblong or subtriangular clear spot. Hind wings with a very large ocellus as in Bunaea. Legs 

 very thick and densely hairy; fore tibia (when denuded) short, moderately stout, and ending 

 in two unequal spines; odoriferous sack very large, nearly as long as the tibia itself, lanceolate, 

 oval, acuminate, the tip sharp, polished, and from it on the outside extends a polished ridge to 

 the base. Two long unequal spines on third pair of legs. 



Genitalia: The suranal plate narrow, forked at the end, or rather with a deep sinus; a 

 simple pair of claspers, from side view broadly triangular, and from above and beneath long, 

 narrow, and acute; penis acutely triangular. Genitalia are of the same general type as in Thyella 

 and Acanthocampa. 



Larva. — [Packard,. Psyche, IX (1901), p. 281.] Body thick, armed with singular smooth 

 sharp spines, which are appressed, grown to the skin, only the rounded or sharp ends rising 

 up and directed inwards and backwards. The head is unarmed, but on the clypeus anteriorly 

 is a low conical tubercle (a feature we have never observed in any American or European larva). 

 Spines smooth, not bearing any setae. Near the spiracles are situated groups of crateriform 

 warts. The median spine on the eighth abdominal segment is forked. The suranal plate is sub- 

 triangular, with the apex much rounded; and the surface tuberculated; anal legs large, triangular. 



