DIDONIS.—CYSTINEURA. 277 
D. aganisa is found in second-growth woods and in clearings on the borders of the 
forest. 
2. Didonis biblis. 
Papilio biblis, Fabr. Syst. Ent. p. 505°. 
Didonis biblis, Bates, Journ. Ent. 316’. 
Papilio hyperia, Cr. Pap. Ex. ui. t. 236. E, F°. 
Didonis pasira, Doubl. Gen. Diurn. Lep. p. 406, t. 31. f. 24; Butl. & Druce, P. Z. 8. 1874, p. 347°. 
D. aganise similis, sed fascia posticarum coccinea haud subrecta sed margini externo parallela, venisque 
nigris divisa distinguenda. 
Hab. Nicaraaua, Chontales (Belt); Costa Rica (Van Patten®), Irazu (Rogers).—Soutu 
America from Colombia to Paraguay ; Harti. 
Didonis biblis is a common species found over nearly the whole of Tropical America, 
and occurs within our borders as far north as Nicaragua. Though subject to slight 
- variation there seem no sufficient grounds for subdivision of the species; at the same 
time we note that specimens from the Upper Amazons and the neighbouring districts 
have the red band of the secondaries unusually wide, agreeing with, and even exceeding in 
this respect, Cramer’s figure of P. hyperia from Surinam ?, We observe no difference 
between examples from Nicaragua and others from South Brazil and Paraguay. 
Messrs. Butler and Druce ® identify the Costa-Rica insect with D. pasira of Doubleday 4; 
but we believe this name to be a synonym of D. diblis, Fabricius. 
Mr. Bates says that this insect flies about waste grounds on the borders of the forest, 
hovering moderately slowly over bushes ?. 
CYSTINEURA. 
Cystineura, Boisduval, Sp. Gén. t. 9. f. 1 (1886) ; Westw. Gen. Diurn. Lep. p. 406; Bates, Journ. 
Ent. ii. p. 317. 
Mr. Bates considers this genus to be, with Olina, related to Didonis, Pyrrhogyra, &c. ; 
but without disturbing this arrangement we cannot but feel that the differences 
separating them are of considerable importance. Besides the difference in the outlines 
of the wings the fact of the tibia and tarsus of the front leg of the male being 
atrophied so much as to form a simple knob at the end of the femur is peculiar in the 
Nymphaline, and recalls the structure so common in /¢huinia and its allies. There are 
points too in the secondary male sexual organs described below which ought not to be 
overlooked. 
Nine or ten species have been recognized of Cystineura, whereof only one, C. amymone, 
has been found within our region, though the very closely allied C. dorcas may also 
occur within the northern frontier. The other species are distributed over Tropical 
South America, one being found in the island of Jamaica. 
