NEUROPTERA. 301 
on the inner margin at one-third of the appendage-length is a moderately acute, backwardly-directed 
tooth, following which the inner margin is slightly convex and finely denticulated to about two-thirds of 
the appendage-length, the convex part terminating without any excision, but gradually curving to form 
the terminal third of the appendage, which ends in a rounded tip. In profile view the superiors are 
nearly straight in the basal two-thirds, curved somewhat downward in the terminal third with a rounded 
tip; the inferior margin presents three convexities, which are greatest at the extreme base, at one-third 
length and almost at the apex, and two concavities, which are at their maxima at one-fifth and at three- 
fourths length. 
Inferior appendages one-half (Costa Rican 3), or one-third (Bogota 3), as long as the superiors, even in the 
Costa Rican ¢ not reaching to the level of the hind end of the denticulated part of the inner margin of 
the superiors ; in dorsal view curved toward each other in their apical half; in profile view constantly 
decreasing in thickness from base to apex, this decrease much more marked in the proximal half, apical 
half (Costa Rican ¢), or third (Bogota ¢), curved upward, rather slender. 
Legs black, tibiee superiorly with a pale green stripe, inner surfaces of femora pale in the proximal half 
of each. 
Wings very faintly yellowish, pterostigma almost black, its bounding-veins concolorous; 13-15 postcubitals 
on the front wings, 11-14 on the hind. 
©. Unknown. 
Dimensions, g¢.— Abdomen 36°5-37°5, hind wing 25°5-26-5, costal edge of stigma of front wing 
1:6-1°8 mm. 
Hab. Costa Rica, Camino de La Palma between Guadalupe and El Alto (Biolley, 
coll. Kahl: 1 3 ).—Coxomstia, Sta. Fé de Bogota (Lindig, 1863, MC. Z.: 1 3). 
Dedicated to Mr. Samuel Henshaw, Curator of the Museum of Comparative Zoology, 
Cambridge, Mass., whose kindly aid it has been a frequent pleasure to acknowledge in 
the course of this work. 
Resembles ZL. simplex, but is larger, more robust (width of head and of thorax 
4-7 and 3 mm. respectively, in simplex 4°5 and 2°5 mm. respectively), mesepimeral 
black stripe wider (:3--4 mm. in simplex), inferior appendages relatively shorter 
(in simplex three-fourths as long as the superiors and reaching to the hind end of 
the denticulated part of the inner margin of the superiors). 
Lestes sigma (p. 49). 
3. The Brownsville example has the distal two-thirds of the pterostigma distinctly yellow; one of those 
from Altamira has the distal fourth of the same of a paler brown than the remaining three-fourths. 
The basal tooth of the superior appendages is more rounded in the Altamira specimens, which are 
entirely pruinose on thorax and, in one, also at base and apex of abdomen; 10-11 postcubitals on the 
front wings. 
9 (hitherto unknown). Differs from the description of the d on p. 49 as follows :—Thorax possibly pale 
green in life, antehumeral spot, mesepimeral stripe, spot on inferior edge of metepimeron and adjoining 
part of metasternum black, the mesepimeral stripe about three times wider in its upper than in its lower 
half. Tarsi obscure, but not black. Abdominal segments 3-7 obscure, luteous in great part, with some 
ill-defined black, 8-10 pruinose ; only the distal tip of pterostigma yellowish. 
Dimensions.—Abdomen, ¢ 34:5~35, 2 32; hind wing, g 22-23, 2 22 mm. 
To the localities given, add:—Unitep Srares, Rocks Ranch [1 2 | near Brownsville 
(1 3] (Schaeffer, Mus. Brooklyn Inst.) in Texas.—Mexico, Altamira in Tamaulipas 
(Hoag, coll. P. P. C.: 2 3). 
Taken at Rocks Ranch April 16, at Brownsville in June, at Altamira July 19, 
1903. | 
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