THAUMATONEURA.—PARAPHLEBIA. 59 
and M. Martin has made the drawing reproduced as fig. 27, Tab. IIL., therefrom. He 
adds this description :—‘ L’appendice inférieur est tout petit et bilobé; les supérieurs 
sont fortement croisés l'un sur l’autre; la protubérance est énorme, et la courbure du 
bout trés-forte, puisque la pointe semble remonter vers le 10° segment. Le 10° 
segment a la forme d’un toit.” 
Abdomen 56, hind wing 48-50 mm. 
? unknown. 
PARAPHLEBIA. 
Paraphlebia, Selys,in Hagen, Syn. Neur. N. Amer. p. 71 (1861) ; Selys, Bull. Acad. Belg. (2) xiv. 
p. 8 (1862) ; Mém. Couron. Acad. Belg. xxxviii. p. 32 (1886) ; Kirby, Cat. Odon. p. 122 (1890). 
The material before me, so much more extensive than that at the disposal of de Selys, 
permits the following statements concerning some of the generic characters. The 
pterostigma surmounts 3 to 6 cells. Supplementary sectors between the median and 
the short, two to four in number, between the superior and the inferior of the triangle, 
four to eight; in some cases (2 ¢ 2¢ Purula, both sides) only one row of cells on the 
hind wings between the inferior sector of the triangle and the hind margin; ultra- 
nodal sector arising at 2-5 cells beyond the origin of the nodal. 
This genus is not known outside the limits of the Central-American fauna. The 
species may be separated as follows :— 
A. Median sector separating from the principal at the vein of the nodus or slightly 
beyond. Tips of the wings of the males brown. 
Pectus yellow. Males with the apical fourth of the wings dark brown, beginning 
well in front of the pterostigma, its inner edge concave, bordered by a 
narrower milky-white patch; superior appendages not uniformly curved 
throughout, but bent inward at two-fifths their length. Abdomen, ¢ 49- 
47, 9 42; hind wing, ¢ 39-44, 9 39mm... . 1. zoe. 
Pectus black. Males with the apical fifth of the wings dark brown, beginning 
well in front of the pterostigma, the inner edge straight, not bordered by 
milky-white ; superior appendages as in P. zoe. Abdomen, ¢ 42-44, ¢ 25 
hind wing, ¢ 33-36, 9? 34mm... . coe . 2. guinta. 
Pectus yellow. Males with the apical twelfth to ‘fourteenth of the front wings 
(less on the hind) dark brown, beginning at the inner end or at the middle 
of the pterostigma, the inner edge somewhat convex, not bordered by milky- 
white ; superior appendages uniformly curved throughout, not angulate. 
Abdomen, ¢ 42-47, 2 38-39; hind wing, g 33°5-37, 9 35-36 mm. . . 3. duodecima. 
B. Median sector separating from the principal somewhat in front of the vein of 
the nodus. Wings uncoloured throughout. Pectus yellow. Abdomen, ¢ 44, 
¢ 33; hind wing, f 88, 9 33mm. . 1 1 ee ee ee ts 4, hyalina. 
Are these four but local forms of one species ? 
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