5 
of Butterfly from the East Indies. 
area of the posterior wings is destitute of the purple reflexion, the 
short anal appendage black, with a lunule of silvery white scales, 
and with a black spot on each side of the base of the tail, the 
inner spot being the smallest and marked with silvery scales ; the 
tail is black, with a white tip. 
In the female the wings above are brown, the basal portion with 
an obscure leaden tinge, the edges darker, the upper pair with a 
luteous spot in the centre towards the costa. The anal area is 
marked as in the male, except that the outer black spot is inwardly 
edged with a luteous lunule ; a few luteous scales are also observed 
at the base of the anal appendage. The ciliae throughout white. 
Beneath the wings in both sexes are of a delicate satin appear- 
ance, and of a very pale buff-grey colour, with a double row of 
slender darker lines beyond the middle, enclosing a nearly straight 
and slightly darker fascia in the fore-wings, but farther removed 
from the margin and more irregular in the under-pair. The centre 
of each wing is also maked with a short double row of lines ; 
another and much less distinct double row of markings also occurs 
between the former and the outer margin of the wing, in the hinder 
pair ; these latter markings enclose at the anal region two black 
ocellate spots, the exterior one being inwardly margined with a 
luteous lunule, the other ocellus occupying the anal appendage, 
and ornamented outwardly with a narrow metallic white streak ; 
between these is a silvery blue spot. The margin of the anal area 
of the posterior w'ings is also terminated by a slender black line. 
The posterior wings are very slightly scolloped, the scollops grow- 
ing more distinct towards the tail. 
This insect is nearly allied to Thecla Jarbas and Xenophon of 
Fabricius, described in detail by Dr. Ilorsfield in his Lepidoptera 
Javanica ; from these, however, (as I have been enabled by the 
kindness of the latter gentleman to ascertain from an inspection of 
his Javanese collections,) this insect is very distinct. 
It also appears sufficiently distinct from Polyommatus Philippas 
of Fabr. 
In the determination of the sexes of this species I have been 
guided by the anatomical characters exhibited by the legs ; for a 
knowledge of the peculiarities existing in these organs we are in- 
debted to Dr. Horsfield, who has thence ascertained the singular 
fact, that those individuals of our British species, Thecla quercus, 
which have been described by all authors as the males, are in fact 
females, and vice versa. No figure has, however, hitherto been 
given of the structure of the male anterior tarsus, which consists 
of a single long joint ; this joint is as long as the entire articulated 
