HETERAGRION.—HYPONEURA. 65 
4, Heteragrion erythrogastrum. 
Heteragrion erythrogastrum, Selys, Mém. Couron. Acad. Belg. xxxviii. p- 61 (1886) °. 
Hab. Costa Rica, Caché (Rogers: 1 3); Panama, Chiriqui! (coll. McLachlan: 28, 
one labelled “ erythrogastrum” in de Selys’s handwriting and marked “type,” the last 
three segments lost), Volcan de Chiriqui [8 ¢ ], Bugaba [8 ¢ ], David [1 ¢ ] (Champion), 
Isthmus of Panama (coll. P. P. C.: 1 3). 
Some remarks on this species are given under H. chrysops, ante. The black head 
and thoracic dorsum of the adult males of this species are acquired in the same manner 
as described for H. chrysops, but are carried farther, in that the yellow line on either 
side of the black mid-dorsal stripe disappears by the fusion of this latter with the 
black antehumerals. The male from Caché is remarkable in having its head coloured 
as in H. chrysops: one naturally thinks of a mistaken repairing, but I can detect no 
traces of artificial attachment; otherwise this individual is clearly H. erythrogastrum. 
Antenodal cells on the front wings 2 (95°4 °/,), 3 (2°3 %/,), or 2+ (2:3 °%/,); on the 
hind wings 2 (97:7 °/,) or 8 (2°3 °,). 
Legion 3, AGRION. 
Division I. 
Hairs on the legs numerous, long (each one usually longer than twice the interval 
separating it from its next neighbour). Tarsal claws each with an inferior tooth. 
Inferior sector of the triangle separating from the hind margin of the wing distinctly 
proximal to the submedian cross-vein (at a distance at least equal to the length of the 
cross-vein). 
Wings with two rows of cells between the second sector of the triangle and the 
hind margin . 2. 1. 1 1 6 we ee ee ew ew wwe .)6U YP ONEURA. 
Wings with one row of cells between the second sector of the triangle and the hind 
margin. ee ee ee ee ee ee Arora. 
The males of these two genera agree in having the superior appendages considerably 
shorter than the tenth abdominal segment, and the inferior appendages longer than the 
superiors. Both superiors and inferiors are often bifid at the tip, but the two branches 
so formed are inner and outer in the former and upper and lower in the latter, 
respectively. 
HY PONEURA. 
Hyponeura, Selys, Monogr. Calopt. p. 275 (1854) ; Bull. Acad. Belg. (2) xx. p. 381 (1865) ; Hagen, 
Syn. Neur. N. Am. p. 95 (1861); Kirby, Cat. Odon. p. 187 (1890). 
Two species of this genus are known; the differences between them may be best 
shown by parallel columns :— 
BIOL. CENTR.-AMER., Neuropt., December 1901. k 
