200 
[Octobp:r 
Hind w i n g s 
differently 
shaped from 
front wings; j 
all 4 wings { 
carried hori- I 
zontally in 1 
repose. j 
2nd Tribe. 
Antecubitals of 
the 1st & 2nd 
series not cor¬ 
responding ex¬ 
cept at base. 
Base of the 2nd 
series of post- 
cubitals with 
cross-veins. 
3rd Tribe. LI- 
BELLULIHA. 
Antecubitals of 
the 1st 2nd 
series corres¬ 
ponding. Base 
of the second 
series of post- 
cubitals with 
[ no cross-veins. 
I 
i 
I 
Eyes % 9 remote, 
or touching at a 
single point( Cordu- 
legaster), the touch- > 
ing part of each 
forming an acute 
angle. J 
Eyes ^ 9 touching 
for a considerable 
space, the touching 
part straight, or 
at a single point - 
{^schna heros), the 
touching part roun¬ 
ded in a regular 
curve. 
Each eye laterally ) 
tubercled behind, j 
Posterior edge ofeach ] 
eye simple. J 
3. Gomphina. 
4. .ffisCHNINA. 
5. CoRuuinxA. 
6. Libelluj.ina. 
M. Selys says that the character drawn from the arrangement 
of the eyes “ is the only one which efiectiially separates Gom¬ 
phina from -^schnina;” (il/on. Gomph. p. 4) and in separating these 
two tribes, (p. 2) he defines Gomphina as “having the eyes remote 
one from the other or touching only in a single point (pa?' un point 
seulemenf^^ though under the genus Cordulegaster he adds that the 
eyes of that genus are “transverse.’^ (Mon. Gomph. Table p. 310.) 
After intimating that in ^schna the eyes do also touch, he winds up 
by suggesting that “we should not consider this character in too criti¬ 
cal a manner (d’une maniere trop minutieuse).” So strongly had the 
difficulty of separating ^dflschnina from Gomphina been felt, that Bur- 
M. Selys lays down as a character of the family Aiischnidee, that ‘‘ the dis- 
coidal triangles of all four wings are constructed in an analogous manner”; 
{Mon. G-omjph. p. 2), and Dr. Hagen states of his 2nd Tribe Hischnina (:=Hisch- 
nidse Selys) that “the triangles of all the wings are of the same form.” {Sg- 
no'ps. p. 98.) There are exceptions to this rule in Gomphina. In the genera 
Gomphoides, Chlorogomphus, Petalura and Phenes, the triangles of the hind 
wings are quite dissimilar to those of the front wings. {Mon. Go?nph. Plate 
23 &c.) In all Libellulina known to me the triangles of the hind wings are 
either dissimilar, or dissimilarly situated to those of the front wings. (See 
Hag. Synops. p. 132.) 
