31(3 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Costa Rica: one male Bkistebu, Diquis Valley, 1000 metres, Feb¬ 
ruary, 1897 (coll. C. C. Adams). Columbia: one male (M. C. Z.). 
Venezuela: one male by Appun, type of columba ; the sixth abdo¬ 
minal segment is lost, the abdomen has been mended, and I 
strongly suspect that the last four segments do not belong to this 
male. 
6. B. rapax (Hagen MS.) sp. nov. PI. 1, fig. 17, pi. 2, fig. 24. 
Hagen, Syn. Neur. N. Amer., p. 317, 1861 (no description). 
In addition to the characters given in the preceding analytical 
table there is but to be added — frons above and vertex metallic 
blue ; labrum black, a pale greenish spot each side at base, ham- 
ule like that of nubecula (PI. 1, fig. 17), spot on 7 as shown in PI. 2, 
fig. 24. Wings slightly smoky, hind wings yellowish along the mem- 
bran ule outwards for one cell only and for the same distance in the 
submedian space. 
Front wings with 16-17 antenodals, 12-15 postnodals, hind 
wings with 12-13 antenodals, 13-14 postnodals. 
£ Abdomen 35-36, hind wing 42, pterostigma 3 mm. 
Distribution. Venezuela : two males, types of Hagen (M. C. Z.). 
7. B. pertinax Hagen. PI. 1, fig. 20. pi. 2, fig. 21. 
Dythemis p. Hagen, Syn. Neur. N. Amer., p. 166, 1861. 
Synonym? Dyth. sallei Selys, Ann. soc. ent. Belg., vol. 11, C. R. 
p. 67, 1868 (according to Hagen, Proc. Bost. soc. nat. hist., vol. 18, 
p. 75). 
Vertex and frons above metallic blue; labrum black except for a 
yellow spot at the middle of base, ham ule not so strongly curved as 
to be sickle-shaped, wings clear except for a very pale yellow tinge 
between the costa and the principal sector fading away between 
nodus and pterostigma. 
Front wings with 15 antenodals, 9-10 postnodals, hind wings with 
11 antenodals, 12-13 postnodals. 
£ Abdomen 39, hind wing 41, pterostigma 2J mm. 
Distribution. Mexico, according to Hagen, 1861; one male 
with the label “ Hell 6 ” at Cambridge. 
4. Scapanea Kirby. 
Kirby, Trans, zool. soc. Bond., vol. 12, p. 264, 298, 1889. 
Berl. ent. zeit., vol. 33, p. 362, 1890. 
The only species is 
1. S. frontalis Burmeister. 
Kars eh, 
