62 NEUROPTERA. 
other described form. A comparison with a P. cassandra, 3, from Venezuela, of the 
type material, now in the M. C. Z., shows a very great difference in the shape of 
the superior appendages. 
In my notes I have a record of having identified, some years ago, a male from 
Pacuare del Sur, Costa Rica, 600 metres, as Philogenia cassandra, Hagen. Was it 
really such, or was it the above new species? I have not the specimen now. 
HETERAGRION. 
Heteragrion, Selys, Bull. Acad. Belg. (2) xiv. p. 19 (1862) *; Mém. Couron. Acad. Belg. xxxviii. 
p. 54 (1886) ?; Kirby, Cat. Odon. p. 123 (1890) ’. 
The discovery of a still larger species of this genus than any hitherto described 
necessitates a slight modification of the generic characters as stated by de Selys??, 
viz., subnodal sector arising at from one-third to one-fourth (instead of one-third) of the 
distance from the nodus to the pterostigma. 
Four species occur within the Central-American fauna, and may be distinguished 
as follows :— 
Antenodal cells on the front wings 3, on the hind wings 2 or 3. Subnodal 
sector arising at one-fourth the distance from the nodus to the pterostigma. 
Males with the tooth on the superior appendages at the middle thereof, and 
abdominal segments 3-6 chiefly reddish or reddish-yellow, with the 
terminal sixth black. Size large: abdomen, g¢ 47-51)°5, 9? 40-43; 
hind wing, ¢ 338-35, 9 32-35 mm. woe . 2 ee 
Antenodal cells on the front and hind wings 2. Subnodal sector arising at 
about one-third of the distance from the nodus to the pterostigma. 
Males with the tooth on the superior appendages at slightly beyond the 
middle thereof, and abdominal segments 3-6 chiefly black. Size large: 
abdomen, ¢, 47-48; hind wing, ¢,32-33 mm. 9 unknown . . . 2. majus. 
Males with the tooth on the superior appendages at two-thirds their length, 
and abdominal segments 3-6 chiefly reddish or reddish-yellow with 
the terminal sixth black. Size moderate: abdomen, ¢ 37°5-42°5, 
? 82-83; hind wing, ¢ 23-27, 9 25-27 mm. 
Males with the tooth on the superior appendages at two- thirds the length 
thereof, and abdominal segments 3-6 bright red with no black mark- 
ings. Size moderate: abdomen, ¢ 34-39, 2 29; hind wing, ¢ 22°5—23, 
9 24 mm. . . 
l. tricellulare. 
3. chrysops. 
4. erythrogastrum. 
In the males of H. erythrogastrum the inferior appendages are practically non- 
existent ; In the other species they are sbort and almost filiform at tip, but distinctly 
visible. 
