MECISTOG ASTER. 57 
[4 ¢, 3 2], Panzos [1 ¢], Sabo [1 2], and Purula [20 3, 29 9] in Vera Paz 
(Champion), Livingston (H. Wilson, M.C. Z.: 146, 1 9); Costa Rica, Caché 
(Rogers: 1 2); Panama, Bugaba (Champion: 1 ¢). 
Pterostigma on the front wings occupying 4-8 cells on the front row, 1-3 on 
the second; on the hind wings occupying 3-6 cells; only in one hind wing of one 
female have I found the pterostigma extending into the second row of cells, and 
then only for part of one cell. Colour varying from white, through slightly smoky, 
dirty reddish-white, pale and dark reddish, to dark brown. ‘These differences are 
probably indicative of increasing age, as at least some trace of pruinose colouring 
appears at the bases of the legs, especially the first pair, when red can be detected in 
the pterostigma by means of a lens, Often, however, the amount of pruinosity on 
individuals with dark brown pterostigma is still very slight. On the great majority 
of those having a white or slightly smoky pterostigma, no pruinosity is visible, but 
a trace exists in at least one such female (from Presidio). 
The colours of the labrum, frons, and abdominal segments 8-10 vary, but these do 
not seem to be correlated with the colour of the pterostigma. Thus, individuals with 
white or slightly smoky pterostigma may have the labrum black or pale green, and 
similarly for those with a dark brown pterostigma. The colours on these parts would 
therefore seem to be subject to individual variation to a great degree. 
Another variation which is independent of sex, age, or locality is found in the hue 
of the cross-veins beyond the pterostigma, which may be white (giving the tip of the 
wing a more transparent appearance) or brown. 
Antenodal cells on the front wings 3 (57 °/, 6, 63°/, 2) or 2 (43°/, o, 33°3°/, 2); 
on the hind wings 2 (98°3°/, ¢, 99°/, 2 ). 
Epistoma (nasus) often entirely black, in some specimens margined and traversed 
with black, as stated by Selys !. 
The males from Purula have the superior appendages slightly more swollen at the 
base, and the median apical notch on 10 shallower than in individuals of the same sex 
from Atoyac and other places in Vera Cruz, but the difference is very slight. 
A female captured at Presidio, Vera Cruz, in July has a very marked milky patch at 
the tips of all the wings from the pterostigma outward. It may therefore belong to 
the race iphigenia, Selys, described from Bogota and Panama; but if so, I doubt its 
distinctness from MW. modestus. 
Abdomen, ¢ 65-70, 2? 62-68; hind wing, ¢ 2, 40-45 mm. 
BIOL. CENTR.-AMER., Neuropt., December 1901. ] 
