84 NEUROPTERA. 
16. Argia difficilis. (Tab. IV. fig. 15.) 
Argia difficilis, Selys, Bull. Acad. Belg. (2) xx. p. 413 (1863) '. 
@. Rear of the head black, a narrow yellow line along the eye-margins. Pale antehumeral stripe one-fourth 
as wide as the black mid-dorsal. Humeral stripe twice as wide as the pale antehumeral, not forked, 
enclosing only a very small pale spot at its upper end. Segment 2 metallic black, a small, circular, mid- 
dorsal blue spot, and a narrow, inferior, pale stripe each side; 3-7 black, with a narrow, transverse, basal, 
blue ring, in some specimens a pale mid-dorsal stripe on basal half of 3; 8 and 9 blue, each side with an 
inferior black stripe as long as the segment and a superior spot in the basal half, the two spots often 
confluent with each other and with the inferior stripes at the extreme base of the segment. 
Pterostigma of the front wings ‘9 mm. long, surmounting more than one cell (50 °/,), one cell (43 °/,), or less 
than one (7 °/); of the hind wings 1 mm. long, surmounting more than one cell (72°/,) or one cell (28 °/,). 
Antenodal cells on the front wings 4 (93 °/,) or 3 (7 °/,); on the hind wings 3 (93 °/,) or 4 (7 °/,). 
Dimensions— Abdomen 27:5-29-5, hind wing 21-22 mm. 
d unknown. 
Hab. Panama (Hassler Expedition, M. C. Z.: 1 ¢), Bugaba (Champion: 3 ¢).— 
VENEZUELA (Dr. Habuel*, coll. P. P. C., ex coll. Selys: 1 2); Ecuavor (coll. C. C. 
Adams: 2 2); Pzru, Jurimaguas |. 
There is no evidence to enable me to correlate these females with any of the males 
which I have studied. They have the labrum, nasus, and frons black, with a yellow 
spot on each gena and one on the base of each mandible, which, with other features, 
suggest the possibility of their being the other sex of the males here described under 
the name of 4. rogersi. See, however, the remarks on this subject under that species. 
17. Argia cuprea. (Tab. IV. figg. 22, 41, 41s.) 
Agrion cupreum, Hagen, Syn. Neur. N. Am. p, 96 (1861) *. 
Argia cuprea, Selys, Bull. Acad. Belg. (2) xx. p. 407 (1865)? [nec Calvert, Proc. Calif. Acad. Sci. 
(2) iv. p. 479 (1895) ]. 
gd. Rear of the head black, a pale yellow stripe along the eye-margins below. Thoracic dorsum brilliant 
metallic coppery-red, no pale antehumeral stripe; humeral stripe concolorous and continuous with the 
thoracic dorsum, sometimes with a distinctly purple tinge. Segment 2 black, shining, each side with a 
small basal, a larger apical, and an inferior stripe blue, or all three confluent ; 3-7 black, shining, or 
dark metallic green, a transverse, basal, blue ring, interrupted on 3; 8 black, with a transverse, basal, 
blue ring; 9 blue each side, with an inferior black stripe as long as the segment; 10 blue, except the 
sides inferiorly and a narrow, transverse, apical border, black. 
Q. Differs from the male as follows :—Coppery colours of the thorax of a darker shade. Pale antehumeral 
stripe present, from one-half to three-fifths as wide as the mid-dorsal. Humeral stripe twice as wide 
as the pale antehumeral or of equal width. Segments 2-8 black, a mid-dorsal pale line almost as long as 
the segments and each side with an equally long inferior pale stripe ; 3-7 also with a transverse, basal, pale 
ring, which is sometimes medially interrupted on 3 and 4; 9 pale (blue 2), each side with an inferior 
stripe as long as the segment and a broad superior band from the base to two-thirds the way to the 
apex, black; 10 blue. 
3. Pterostigma of the front wings ‘94-1-1 mm. long, surmounting more than one cell (66°6 ll, a, 
93°75 °/o 2) or one celi (33:3 °/, 3, 6-25 %/, 2); of the hind wings, 1-1:18 ¢, 1:3-1:-4 mm. 2 
long, surmounting more than one cell (85°3 °/, 3,75 °/, 2) or one (14-6 °/, 3, 25, 2). 
Antenodal cells on the front wings 5 (94 °9/, ¢, 100 lo 2) or 4 (6 %/, 3)3 on the hind wings 4 (94°25 °/, 3, 
100 °/, 2) or 5 (5°75 %/, 3). 
Dimensions.—Abdomen, 3 30-32°5, 9 28-30; hind wing, ¢ 22-24, © 23-25 mm. 
* (? Hahnel, a well-known traveller in South America,—Epb. ] 
