234 Mr. R. McLachlan on the 
“Oahu, at no great elevation above the sea” (Blackburn, 
two males, one female, No. 16). 
The two males vary somewhat in the markings of the head 
and thorax. In one the postocular spots are nearly obliterated 
and bluish (instead of yellow or orange), and on the thorax 
the markings are also bluish, and the humeral lines are di- 
stinct, as described for the female, whereas they are wanting 
in the other. They are certainly specifically identical. 
The precise location of this species must remain doubtful. 
On the one hand it approaches Nehalennéa in its slender 
form and bronzy colour, but the anal characters of the male 
appear to preclude such a position; on the other hand, the 
long tibial spines would seem to indicate affinity with Argia. 
Agrion (?) pacificum, n. sp. 
Wings hyaline, obtuse; neuration black. Pterostigma 
lozenge-shaped, scarcely covering the cellule beneath it, 
reddish brown. Quadrilateral having its superior edge about 
one third the length of the inferior in the anterior wings, and 
fully half the length in the posterior. Twelve to fourteen 
postcubital nervules in the anterior wings, eleven in the pos- 
terior, Three cellules between the quadrilateral and nodus. 
Dull black. 
Head small, totally black above (no postocular spots). La- 
bium and margin cf labrum yellowish; orbits broadly yel- 
lowish (or greenish) exteriorly. Back of head black. 
Prothorax having its posterior margin slightly and obtusely 
elevated in the middle in both sexes. In the male there are 
two approximate nuchal spots, two distant discal, and two 
very large, one on each side of the margin, orange or yellow. 
In the female the margin is also yellow on each side of the 
produced portion. 
Thorax with no humeral lines, but with a yellow (or orange) 
humeral spot posteriorly. Sides with two broad yellow (or 
orange) bands—onesupertor and anterior, abbreviated at about 
the middle, but with a corresponding minute posterior spot; 
the other inferior and posterior, proceeding about haltway 
from the wings and then abbreviated. Pectus black. 
Legs black; femora brownish beneath; spines long and 
divaricated, about six on the posterior tibie. 
Abdomen slender, black ; a large reddish or yellow spot on 
each side of the first and second segments; eighth and ninth 
with a broad reddish anterior ring, and the posterior margin 
of the tenth narrowly reddish in the male (in the female these 
segments are wholly black), the ring on the ninth occupying 
nearly half the segment; ventrally the segments have a nar- 
