PIERIDH®—LEPTALIS. 
UNDERSIDE as above, except that the whole of the anterior wing below the sub- 
costal nervure from the base to the apical spot is grey-white and glossy, with a centre 
of dense opaque white scales ; that the posterior wing has a dirty yellow spot on the 
costal margin near the base; that the large spot at the apex extends to the costal 
margin and is quadripartite, and that there are three small white spots near the outer 
margin, inarow ; oneat the middle between the large spots, the others on the sections 
of the large basal transparent spot. 
Female differs in form. In having the second, third, and fourth spots of the 
anterior wing united in one large central band, the large apical spot of the posterior 
wing quadripartite; and on the underside in having the central band where it 
approaches the anal angle white. 
€ 
Expan. 33% in. Hab. Amazon and Cayenne. 
In the Collections of Dr. Boisduval and the British Museum. 
Dr. Boisduval has, with his usual generosity, allowed me to bring to England with me to figure 
this and the other species of the plate. They are both very rare. lL. Rhetes is unique in his rich 
collection. lL. Orise, especially the female, is most remarkable for the very close resemblance which 
it bears to Methona Themisto, and more so still to a new species or variety of Themisto, which has the 
transparent part of the posterior wings divided by a black transverse band into two distinct spots. 
With this it is almost identical, and no one unless he were an entomologist would think of separating 
them. The neryules, however, show that they have no real affinity. 
