508 PAPILIONID.E. 
" Maxillce rather long. 
" Labial palpi very short, clothed with long loose scales ; apparently triarticulate, but the arti- 
culations barely discernible. 
"Antenna; rather long, slightly arched ; club but slightly elongate, compressed. 
" Thorax stout. 
" Anterior xuings triangular ; the anterior and outer margins nearly equal, the inner about half 
the length of the anterior. Costal and subcostal nerrules united at their origin ; first 
subcostal nervule thrown off considerably before the middle of the cell ; the second not far 
from its end ; third and fourth at rather more than an equal distance beyond it, united at 
their origin for about one third of their course ; upper discocellular nearly equal to the 
space between the two discoidal nervules, directed obliquely downwards and backwards ; 
baseo-median not reaching the submedian nervule. 
" Posterior wings folded longitudinally; the inner margin straight, nearly double the length of 
the abdomen, in the male folded back upon the wings and furnished with a tuft of delicate 
hairs ; anterior margin about half the length of the inner ; posterior margin sinuate, 
gradually produced into a long tail curving outwards at the extremity. Precostal nervule 
branched, the inner directed forward, the outer anastomosing with the costal. Discoidal 
cell very short and narrow. Third subcostal nervule bent, and united to the third median 
nervule so as to seem to be a fourth median nervule. 
" Legs rather long, slender. Anterior tibise with a stout spur near the middle, covered with 
scales. Tarsi rather longer than the tibia; ; the first joint equal to the three following 
combined ; second and third nearly equal ; fourth longer than these : fifth longer than the 
fourth. Tarsi of the second and posterior legs nearly double the length of the tibite ; their 
first joints elongate ; second, third, and fourth progressively shorter ; fifth about equal to 
the third. Claws simple or bifid. 
" Abdomen short, stout. 
" This anomalous genus, place it -where we will, interrupts the natural 
succession of the genera in the family to which it belongs. In the situation 
in which it is now placed it disturbs the very easy transition from Pajiilio, 
through Eurtjcus to Parnassius ; but its affinities to some of the species of 
Papilio are so close, that we cannot, in a linear arrangement, interpose any 
other form between it and that genus. 
" The nem-ation of the anterior wings is very remarkable from the apparent 
bifurcation of the third subcostal nervule ; an appearance due to the union, 
at their origin, of the third and fourth subcostal neiTules. The posterior 
wings offer an equally striking character, the smallness of the cell, to which 
must be added the singular bend of the third subcostal nervule, which might 
cause it to be mistaken for a fourth median. This peculiarity and the 
structui-e of the posterior Avings in Leucophasia and some other genera lead 
me to suspect that this nervule should be considered as quite distinct from 
