WRIGHT— ON LIBELLULIDZ OF THE SEYCHELLES. 228 
Length of abdomen 24-25 millim, hind wing 27, pterostigma 22. 
&$ Adult characterized by the coloration of the front, of which the 
excavated upper portion is greenish-blue, not metallic, surrounded 
with blackish. The upper lip is yellowish, encircled with blackish, 
and with a median blackish line; the lower lip yellowish, with the 
median lobe entirely blackish, and, with the inner borders of the lateral 
lobes, forming a median space of that colour. Abdomen strongly 
powdered with bluish; third segment greatly constricted. 
In the ¢ non-adult, and in the P? (which was taken by the late 
M. Julien Desjardins in the island of Mauritius), the thorax is not 
powdered with bluish; it is blackish, with an antehumeral band, two 
lateral ones on each side, and several spots beneath orange-coloured. 
In the ¢ the abdomen (which is not pulverulent) has a double median 
orange-coloured spot on the first to the seventh segments; the eighth 
much dilated at the sides. 
3. Libellula trivialis, Ramb. 
One female, which does not differ from Rambur’s types indicated 
from Bombay and Macao. A priort I was induced to unite with it the 
allied species L. flavistyla of Africa, or L. tetra of the Mauritius; but 
the number of the ‘“‘ post-trigonal’’ cells and of the cells in the interior 
triangle of the superior wings are opposed to this, as well as the form 
of the abdomen and of the vulvar scale, which are quite like those of 
L. trials. 
4. Zygonyx (?) luctifera, n. sp. 
6 Abdomen 32 millim., inferior wing 35, pterostigma 14. 
Wings hyaline, scarcely tinted; membranule long, pale brown; 
discoidal triangles free, that of the upper wing narrow, acute at the 
lower angle, followed by two rows of post-trigonal cellules, the inter- 
nal triangle of the superior wings of two cellules but scarcely to 
be distinguished from those adjoining; a single transverse basal 
nervule in the space between the submedian nervure and the postcosta 
in all the wings; the nodus nearer to the apex than the base of the 
wings; ten antecubital nervules inthe superior wings, the last isolated ; 
seven to eight in the inferior. Almost entirely coal-black (with steel- 
blue reflections on the front and forepart of the thorax). Some dull 
yellowish markings, indistinctly indicated, as follows :—a transverse 
band on the face, comprising the nasus and the rhinarium ; five or six 
spots on each side of the thorax, and a vestige on the sides of the 
second abdominal segment. Femora dull brown externally. 
Eyes prominent, somewhat contiguous. Prothorax with the pos- 
terior lobe subtriangular, rounded. Abdomen slender, cylindrical, not 
constricted, becoming narrower from the base to the extremity. Legs 
slender, ciliated. Anal appendices simple, thrice the length of the 
tenth segment. 
9 unknown. 
This species appears to me to belong to the genus Zygonyx, of which 
