PALEMNEMA, | 133 
II. Median lobe of the labium bifid in its apical half to two-fifths, the two divisions 
so formed being often twice as long as the width of the interval separating 
them ; the normal submedian cross-vein nearer the first antecubital than the 
second, or nearly midway between the two; no supplementary submedian 
cross-vein ; superior sector of the triangle ending at less than half the length 
of the wing ; biserial hairs on the basal half of the second and third tibize 
equal to or shorter than the intervals separating them; cells of the wings 
generally with their longer diameters parallel to the longitudinal veins. 
A. Inferior sector of the triangle present but very short, ending against the 
cross-vein descending from the distal end of the quadrilateral*; nodal 
sector arising nearest the fourth postcubital on the front wings, nearest the 
third on the hind ; superior sector of the triangle ending a little after the vein 
descending from the nodus *; 9-11 postcubitals on the front wings, 7-10 on 
the hind; superior appendages of the males quite complicated . . . . . NeonEURA. 
AA. Inferior sector of the triangle entirely absent ; nodal sector arising nearest 
the fifth or sixth postcubital on the front wings, nearest the fourth or fifth 
on the hind; 9-14 postcubitals on the front wings, 7-12 on the hind; 
femora not compressed . 2. © 2. 1 1 1 we ee ee ee ee ee) 6 PROTONEURA. 
The above statement of the characters of these three genera } is based on a statistical 
study of the material hereinafter listed, on an examination of a few specimens of 
Neoneura carnatica, N. palustris, an undescribed species of the same genus from Peru, 
Protoneura capillaris, P. sp. from Brazil, and on the existing literature. 
PALZMNEMA. 
Palemnema, Selys, Bull. Acad. Belg. (2) x. p. 434 (1860)'; Mem. Couron. Acad. Belg. xxxviii. 
p- 145 (1886) *; Kirby, Cat. Odon. p. 182 (1890)°*. 
Two species of this genus} have been described1?2 from Venezuela; five others 
belong to the present fauna, and are distinguished as follows :— 
1. Wings of male with the apical fourth to fifth dark brown, which begins about 
seven cells proximal to the pterostigma; inner margin of superior appendages 
of male not distinctly angulate where the appendages widen to form the apical 
* For some variations, see the footnotes, infra, under Neoneura. 
+ From an examination of some larval wings of the legion Agrion, it would appear that the vein called 
“inferior sector of the triangle” by de Selys and later authors, including myself, is in reality composed of 
two parts: a proximal portion corresponding to the anal vein of Comstock and Needham (Amer. Nat. xxxii. 
pp. 904-5, figs. 61, 62), and a distal portion equivalent to the second branch of the cubital. The point of 
junction of these two parts is at the cross-vein descending from the apex of the quadrilateral. If this be 
correct, then in Meonewra and in Palemnema the distal part of the inferior sector (Cu, of C. and N .) has been 
lost, in Neoneura the proximal part remains, in Palemnema only a portion of the proximal part remains, in 
Protoneura both distal and proximal parts have entirely disappeared. (Cf. Tab. VI. figg. 6-9.) 
+ De Selys has remarked (J. c.* p. 146): “ La paulina et sa race destderata imitent assez bien par la coloration 
opaque du bout des ailes la Paraphlebia zoe de la méme contrée.” The resemblances to which he thus refers 
