30 MEMOIRS NATIONAL ACADEMY OF SCIENCES. vol. xii, 



Markings : Ground color white, spotted, or marbled with red ; a large round discal ocellus 

 of nearly the same size in each wing. Hind wings nearly white. Fore legs with two large 

 stout tibial spines at the end of the fore tibia, the outer spine larger than usual; the tibia is 

 unusually short, compared with the femur. The odoriferous appendage is about three-fourths 

 as long as the tibia itself, narrow, subacute, and hairy on the inside. 



This genus is SaturniaAike in shape and size of wings, as well as the discal ocelli, but the 

 venation shows plainly enough family distinctions; it is remarkable for the very short bushy 

 palpi, which are only one-jointed, and for the antennae which are not bipectinate, the discal 

 pair of pectinations entirely wanting, there being no vestiges of them. 



Geographical distribution. — British East Africa, Tzavo. 



USTA ANGULATA Rothschild. 



TJsta angulata Rothschild, Novitates Zool., II, p. 50, PI. X, fig. 5, 1895. 



Imago. — One 6* . Body and wings a ground color of white scales, spotted and marbled 

 with scattered bright roseate pink red scales. Head in front and fore legs tawny; breast roseate. 

 There are on the body two roseate lines, one on each side of the thorax, also a transverse roseate 

 line across the basal abdominal segment; the abdomen being white marbled with pink red. 

 The scales arc very fine and close. 



Fore wings wliite, with scattered pink scales. An extradiscal very deeply and sharply 

 zigzag line. Discal ocellus a black ring inclosing a bright ochre-yellow area, with a reddish 

 center; the same on the hind wings, which are crossed by a wavy extradiscal line. The mark- 

 ings are the same beneath. 



Expanse of fore wings, 9 92 mm. 

 Length of fore wing, 9 45 mm. 

 Breadth of fore wing, 9 23 mm. 

 Length of hind wing, 9 32 mm. 

 Breadth of hind wing, 9 24 mm. 

 Described from a much rubbed imperfect specimen, received from the British Museum, 

 with the examples in which my specimen was compared and named. 



Geographical distribution. — "British West Africa (Gregory coll.), Tzavo (from British Mu- 

 seum); Mombasa, East Africa, lat. 4° 5' (Rothschild)." 



Rothschild states that this species differs from U. waUengreni: First, "the transverse angu- 

 lated submarginal band in U. waUengreni (Feld.), is convex, follows the outline of the wings, 

 and its angulations are the same size throughout, while in angulata the band is quite zigzag 

 and the lower angulations are quite three times the size of the upper; secondly, the ocelli are 

 much larger, and the fulvous center is reduced to a narrow ring. " "Expanse 3£ inches = 88 mm." ■ 



USTA WALLENGRENI (Felder). 



Salurnia waUengreni Felder, Wien. Ent. Mon., Ill, p. 323, Taf. VI, fig. 2, 1859. 



TJsta waUengreni Wallengren, Wien. Ent. Mon., VII, p. 142, 1863. 

 Saturnia terpsichorina Westwood, Oatcs, Matabele Land, p. 357, 1881. 

 Saturnia waUengreni Butler, Trans. Ent. Soc. London, 1889, p. 391. 

 Heniocha terpsichorina Kirby, Syn. Cat. Lep. Hot., I, p. 771, 1892. 



TJsta waUengreni Rothschild, Nov. Zool., II, p. 50, 1895. 



[Geographical distribution, Caffraria]. — Fifty miles inland [from] Mombasa (Tring Museum). 



USTA (?) TERPSICHORE Maassen. 



Plate XXXI, fig. 13. 



Saturnia (?) terpsichore Maassen and Weymer, Beitrago Schmett., fig., $ , 113, 9, 114, 1885. 

 Heniocha terpsichore Kirby, Syn. Cat. Lep. Het., I, p. 771, 1892. 

 Heniocha terpsichore Rothschild, Nov. Zool., II, p. 49, 1895. 



Imago.— One 9 • Head a little darker, more fulvous than the thorax, which is of a soft 

 pale leonine hue or fawn color, with no pink scales. Antennae well pectinated. Palpi deep red, 

 as also the fore legs, except the last tarsal joint which is fawn color. 



