190 INSECTA, 
on the thorax; abdomen ensiform, sometimes brown, and at 
others slate coloured, with yellowish sides *. 
FEsuna, Fab. 
The Aishnz resemble the Libellule proper in their mode of bear- 
ing their wings, and in the form of their head, but their two poste- 
rior ocelli are placed on a simple transverse elevation in the form of 
acarina. The intermediate lobe of the labium is also larger, and the 
two others are distant and armed with a very stout tooth and spini- 
form appendage. ‘The abdomen is always narrow and elongated. 
The body of the larvee and the nymphs is also more elongated than 
that of the Libellule in the same states. The mask is flat, and the two 
pincers are narrow, and have a small movable nail at the extremity. 
The abdomen is terminated by five appendages, but one of them is 
truncated at the end. 
fE. grundis ; Libellula grandis, L.; Rees. Insect. Aquat., 
Vi,iv. One of the largest species of this family, being nearly 
two inches and a half in length; fulvous-brown; two yellow 
lines on each side of the thorax; abdomen spotted with green or 
yellowish; wings iridescent. It darts with amazing rapidity 
over meadows, and along the shores of rivers, &c., pursuing flies 
in the manner of the Swallow +. 
Agron, Fab., 
Where the wings are elevated perpendicularly when at rest, the 
head is transversal, and the eyes are distant. 
The form of the labium is analogous to that of the A&shnz, but the 
intermediate lobe is divided in two, down to its base. The third 
joint of the laterai lobes is inthe form of a membranous ligula. The 
antenne seem to be composed of but four joints. The forehead pre- 
sents no vesicle, and the simple eyes are almost equal, and arranged 
in a triangle on the vertex. The abdomen is very thin or even fili- 
form, and sometimes very long. That of the females has its posterior 
extremity furnished with serrated lamine. 
The body of these Insects, in their first and second states, is equally 
slender and elongated, and the abdomen terminated by three fin-like 
lamine. The mask is flat, the superior extremity of the menton- 
niére being raised into a point in some, and forked or sloped in 
others; the pincers are narrow, but terminated by several dentations, 
and resemble hands. 
A. virgo; Libellula virgo, L.; Reoes., Insect. Aqat., VI, ix. 
Golden-green or green-blue; superior wings, sometimes either 
entirely blue or only in the middle, and sometimes of a yellow- 
* For the other species, see Fabricius, Entom. Syst., and Latreille, Hist. Gener. 
des Crust. et des Insect., XII, p. 10, et seq.; but particularly the Monographs of 
the Insects of this family, from the environs of Bologne, published in Latin by M. 
Van der Linden, that which he has since given on the species of Europe, and finally 
another Monograph of European Libellule, forming a part of the already quoted 
work of M. Toussaint Charpentier. 
+ See the same works. The Ashna forcipata might form another subgenus. 
or 
