NEONEURA. 139 
Hab. Mexico, Medellin near Vera Cruz [1 ¢ in fragments], Rio Grijalva, Teapa in 
Tabasco [1 3] (H. H. Smith); Guaremata, Cubilguitz in Vera Paz (Champion: 30 ¢ ), 
Livingston (ZH. Wilson, M.C. Z.: 43,1 2). 
At Medellin and Teapa in January, at Livingston between February and April. 
[2. Neoneura aaroni, sp. n. (Tab. V. fig. 37.) 
3 (a, very young). Very pale (blue or yellow? in life) with the following blackish markings: three dots at 
base of labrum, two on clypeus, two on frons in front of the ocelli, two on each side of vertex at eye- 
margins, one on each end of occiput, a short transverse streak at the location of each postocular spot of 
various genera of the legion Agrion, an interrupted line on each side of the mid-dorsal thoracic carina 
and on the second lateral thoracic suture, a complete line on the humeral suture, a short superior line on 
the upper end of the obsolete first lateral suture, narrow rings at the articulations of the abdominal 
segments, apical eighth of 3-6; 8 and 9 obscure. | 
3 (6, older stage). Pale brown appears on the dorsal surface of head and thorax, the postocular streaks are 
larger and united with an anteriorly-trilobed vertex-spot, the middle lobe of which occupies the area 
enclosed by the ocelli, the line along each side of the mid-dorsal carina is uninterrupted, pale brown 
appears on the sides of 3-7 leaving only a transverse basal ring and a mid-dorsal line of the original pale 
colour, 8 and 9 much darker. Even at this stage there is a slight but distinct pruinosity on the darker 
parts of head and thorax. 
3 (c¢, oldest stage represented). Dorsal surface of the head (as far back as the ocelli) and the thoracic dorsum 
bright brick-red, the former with the black dots as described above for a, the trilobed vertex-spot 
described for 6 darker, blackish, more sharply defined, and confluent posteriorly with black covering almost 
the entire rear of the head; a mid-dorsal thoracic and a humeral stripe black, leaving the bright red 
antehumeral area between them twice to equally as wide as the mid-dorsal stripe; the humeral black 
stripe occupies all or nearly all the mesepimeron; black also covers more or less of the metapleura 
according to the individual’s age; abdomen dark brown or black, with very narrow, interrupted, pale, 
transverse, basal rings and a fine, pale, mid-dorsal line, almost as long as the segments, on 3-7 ; femora, 
first: tibiz superiorly, third tibie inferiorly blackish. All the blackish parts in this stage are more or less 
covered with pruinosity, and I should expect the oldest males of this species to be entirely black and 
pruinose. 
Superior appendages slightly more than half as long as segment 10, pale in younger, black in older individuals, 
quite irregular in outline, their general plan of structure similar to that of V. amelia, but the details 
different, as may be seen by comparing figg. 36 and 37, Tab. V. Inferior appendages about as long as 
segment 10, simple, conical, directed slightly upward. 
@. Most of the females at hand are coloured like 3 a above, although abdominal segments 3-6 have a narrow, 
anteapical, obscure ring instead of the apical eighth black, and 9 is pale instead of obscure. One female 
is older, has the head and thorax similar to ¢ a above, but the abdomen appears to have been blue in 
life with a narrow black stripe on each side of 4—7, 8-10 obscure, 10 somewhat pruinose, with a mid- 
dorsal apical patch. Appendages simple, longer than half of segment 10. 
3 2. Wings hyaline, arculus at the second antecubital (50°/, front wings, 70 °/ hind) or slightly beyond it ; 
inferior sector of the triangle * arising at the submedian cross-vein (95°3 °/, front wings, 90°8 °/, hind) ; 
Neoneura aaroni, apparently resemble the condition described by de Selys (1886) as normal for NV. waltheri 
of Brazil. 
* In one front wing (¢) and two hind wings (@) the inferior sector of the triangle ends freely in the 
wing-membrane as a “ floating ” vein, without any attachment to other veins, at from one-third to two-thirds 
the level of the quadrilateral. In three front wings ( ¢ ) the vein next distal to that descending from the 
nodus is forked near the hind margin of the wing, and the superior sector of the triangle reaches the proximal 
division of this fork (¢f. footnote to NV. amelia, p. 138); one hind wing (¢ ) has the same sector reaching the 
vein next distal to that descending from the nodus. 
