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Genus THALIURA. 
The genus to which we have assigned the above 
name has been hitherto blended with the Urania. 
It is doubtless very closely connected with these 
insects ; but the differences both in the appearance 
of the perfect insects and the respective caterpillars, 
render it expedient that they should be separated. 
The character by which it and Urania are widely 
separated from all others, is the form of the antenna?, 
which are filiform nearly to the middle, where they 
thicken a little, and from that gradually narrow to a 
point. The palpi are lengthened and slender, hav- 
ing the second joint greatly compressed, the terminal 
one more slender, neai'ly cylindrical, and naked. 
There is no closed discoidal cell in any of the wings, 
and almost all the nervurcs diverge from the base. 
Not many different kinds are known, and, with 
one exception, they are natives of America and the 
West Indian Islands. Their splendid tints of 
golden green arranged in transverse bars, render 
them perhaps the most chastely beautiful insects 
that exist, and has caused them to be named Eme- 
rald Butterflies in this country. Sometimes also 
they are called Pages. They fly so high in the air 
and with so much velocity, that it is nearly impos- 
sible, Madam Merian informs us, to catch them, 
