114 _NEUROPTERA. 
[8. Enallagma basidens, sp. n. (Tab. V. fig. 16.) 
dg. Blue, with the following parts black: a transverse stripe at the base of the labrum, the greater part of the 
nasus, except the free margin, and sometimes a pair of small subcentral spots or a subcentral streak ; 
antenne, except the first joint, and the anterior surface of the second joint, vertex (there being a slender 
blue cuneiform postocular spot each side, the two connected by a blue occipital line), dorsum of the 
middle prothoracic lobe (on which is a median, and a right and a left crescentic spot, blue) ; the greater 
part of the thoracic dorsum, except the median carina, and an antehumeral stripe which are blue, the 
latter being about one-fourth as wide as the distance between the mid-dorsal and humeral sutures; a 
narrow mesepimeral stripe confluent below with the black humeral stripe, from which it is separated 
above by a blue stripe narrower than itself; this black mesepimeral stripe does not quite reach the base 
of the front wings, except in the Austin male, where it fuses with the upper end of the humeral stripe ; 
dorsum of segments 1-8 for their entire length, the black being wider at the base and before the apex 
on 2, on 3 having a hastate form which widens greatly in the apical sixth; a hastate spot on 4-6 
occupying the apical half to three-fourths on 4, half to three-fifths on 5 and 6; almost all the dorsum 
of 7, except a transverse, medially-interrupted, basal ring ; dorsum of 10, narrowed posteriorly ; venter of 
3-6 or 7; an external (supero-anterior) stripe on all the femora and on the proximal half of the first 
tibie. 
Hind margin of abdominal segment 10 with a pair of small submedian denticles. Superior appendages about 
three-fourths as long as segment 10, black, or pale with black tips; viewed from above, slightly curved 
throughout their length with the convexity outward, a small internal tooth at the apex; viewed in 
profile, upperside slightly convex, apex truncated almost at right angles thereto, underside in its 
proximal half with a rather slender tooth directed downward almost at right angles, yet slightly distally, 
the tooth not quite half as long as the entire appendage; just beyond this tooth the appendage is slightly 
constricted, in profile view, whence the lower margin descends somewhat to the apex which has thereby 
a greater vertical dimension than the base. Inferior appendages, viewed from below, feebly bilobed, the 
outer lobe longer and more slender, and, in profile view, reaching as far backward as the tooth of 
the superiors when these latter are fully extended. Most of these individuals, however, have retracted the 
superiors at death so that their tooth is not clearly visible and does not project as far backward as does 
the slender lobe of the inferiors. 
Pterostigma luteous, surmounting less than one cell, its anterior distal angle the most acute. 
9. Similar to the male, the blue replaced by yellow on the head and by pale green on the thorax ; some pale 
marks around the ocelli in some specimens; the pale antehumeral stripe about one-third as wide as the 
distance between the mid-dorsal and humeral sutures ; the narrow black mesepimeral stripe not confluent 
at either end with the black humeral stripe, not reaching either the base of the wings above nor the 
mesinfra-episternum below (in the Blanco Co. example confined to the lower half of the mesepimeron) ; 
segments 4-6 like 3 of the male, 7 as in the male, 8 with a mid-dorsal blackish band for its entire 
length, 9 with a pair of dorsal black spots in the basal half, the rest of 9 and all of 10 blue. No dark 
markings on the third legs. Appendages pale, straight, slender, as long as segment 10; apical ventral 
spine of segment 8 well developed; genital valves with the lower margin distinctly denticulated in the 
apical half, their palps not reaching as far back as the tips of the appendages. 
In both sexes the hind margin of the prothorax is entire, convex, somewhat flattened dorsally. 
Dimenstons.—Abdomen, g 18°5-19°5, 9 18°5; hind wing, ¢ 11-12°5, 9 12°5 mm. 
Hab. Unitep Statss, Austin [er coll. Banks: 1 3], Blanco Co. [Schaupp: 1 2 | 
(coll. P. P. C.), San Antonio (Schaupp: 1 ¢ ), Corpus Christi region? (S. F. Aaron, 
coll. A. N. S.: 3 3,2 2, one pair in cop.), all in Texas. 
The Austin and the San Antonio males are dated as having been captured in late 
October. ; . 
This species will no doubt be found in Tamaulipas and perhaps still farther south. 
See footnote, p. 102, for some further remarks upon it.] 
