210 
[October 
never “ dislocated ” as the other antecubitals are towards the nodus, (p.) 
In the Asiatic type of Macrogomphus^ however, it is the 1st and the 
7th. not the 1st and the 5th antecubitals which are thus thickened. 
In JEschna (constricta) and Anax (Junius) the medial antecubital 
which is thus thickened and not dislocated varies in the same species, 
in the same sex, and sometimes even in the right and left wings of 
the same individual, from the 6th to the 7th; thus proving that in 
u^schnina, at all events, this character is not even of specific, much 
less of generic or subgeneric value. 
Het^erina. 
The following Table of the sub-groups of the subgenus Hetaerina, 
copied with additions from Selys and Hagen’s Monogr. Calopt., will 
probably be found both useful and interesting. Of this subgenus 31 
species, all American, are now described, 9 of which exist in the U. S. 
and probably many more remain to be discovered. 
Pterostigma 
sent 9 
f f Tip of hind wings hyaline 
! Tip of hind wings with a 
Tibise black ] red spot, 
ab- -J j Tip of all 4 wings with a 
[ red spot, 
Tibise ‘^superiorly” (or exteriorly) pale. 
(Tip of wings with no spot.) 
Tibiae “superiorly” (or exteriorly) pale. 
(Tip of 'Swings with no spot.) 
I 
Pterostigma pre¬ 
sent'^ 9 ’ some¬ 
times rudimen- 
tary. 
Tip of wings, especially 
the hind ones, bordered 
with brown. 
Tibi* black.. 
Tip of % hind wings with a | 
I brown spot. j 
I Tip of hind wings with a 1 
I red spot. j 
I Tip of all 4 wings with a ( 
I red spot. j 
1 species, S. A. 
8 sp. S. A. and 1 
- sp. U. S. {sep- 
tentrionalis.) 
■ 4 sp. S. A. 
2 sp. IST.A. and S. 
A. and 1 U. S. 
{californica.) 
4 sp. IT. S. {ame- 
ricana, basalts, 
pseudamerica- 
na n. sp. and 
texana n. sp. 
1 sp. S.A. 1 sp.N”. 
A. & 3 sp. U. S. 
{tricolor, ru- 
pinsulensis 
Walsh and ru- 
pamnensisn. s. 
1 sp. S. A. and 1 
sp. A. 
1 sp. N. A. 
1 sp. S. A. 
1 sp. S. A. 
11. AMERICANA? Fabr. A single % , which I refer with some hesita¬ 
tion to this species chiefly because the % abdominal appendages agree 
both with the figure and with the description in the Monographie, was 
