16 RHOPALOCERA. 
margin of the secondaries beneath, just as in A. ewrimedia. Southward of the Isthmus 
precisely similar specimens occur in Colombia, where, however, it is probably found 
only on the northern coast, in the great valley of the Magdalena and in Venezuela. 
Its presence in the latter country enables us to bestow upon it the name proposed by 
Doubleday for it more than thirty years ago 1. 
We have figured a male from Panama. 
9. Aeria pacifica, n. sp. (Ithomia eurimedia. Tab. III. figg. 10, 11.) 
A, agne simillima, sed alarum marginibus nigris, subtus medialiter rufo notatis. 
Hab. Guatemaa, Quirigua, Polochic valley, Retalhuleu (/. D. G. & O. S.). 
In arranging our coilections after our return from Central America in 1863, Mr. 
Bates distinguished this insect as a variety of A. ewrimedia under the above name. 
Since then the receipt of additional specimens of it, and also of the more southern 
race, leads us to believe that the brighter citron colour of the markings of the wings, 
and the narrowness of the median band of the secondaries, are constant characters by 
which it may be distinguished from A. ewrimedia, and that the rufous marks in the 
black margins of the secondaries beneath distinguish it without fail from its near 
neighbour A. agna. 
We found this species common in September in the forest in which the Indian ruins 
of Quirigua are situated; but it was still more abundant in the same month in the 
cocoa-plantations in the outskirts of the village of Retalhuleu, which lies on the Pacific 
side of the Cordillera, at the foot of the mountains, about 900 feet above the ocean. 
Our figure is taken from a male specimen captured in the valley of the Rio Polochic 
below the village of Tucuru. 
b. Femur of front leg of male as long as or longer than the coxa. 
THYRIDIA. 
Thyridia, Hiibner, Verz. bek. Schmett. p. 9 (1816); Zutr. ex. Schmett. ff. 163, 164 (1818) ; 
Doubl. & Hew. Gen. Diurn. Lep. p. 117 (1847). 
Aprotopos, Kirby, Cat. p. 19. 
Tarsus of female with four joints; a pair of spurs on the third joint only. 
Great difficulty surrounds the correct application of this name. Hubner, in first’ 
introducing it, associated together 7’. themisto, Hibn., Papilio psidii, Linn., and P. alione, 
Cr. T. themisto Hiibner figured in his ‘ Zutrage;’ the figure, as usual, is so good that 
no doubt whatever exists as to what species he represented. ‘This species was after- 
wards selected by Doubleday and Hewitson as the type and only representative of the 
