334 DRAGONFLIES OF NORTH AMERICA 
posterior legs. Abdomen pale, segments 1-8 inclusive with the dorsum entirely 
metallic black, except for narrow basal rings on 3-6. Segment 9 entirely pale 
except for a transverse apical line of black. Segment 10 entirely black on the 
dorsum. Superior appendages black, bifid, shorter than 10. No tubercle present. 
The upper arm sbort, subtriangular; the lower, oval and semirotated under the 
upper, so that a line drawn through its long axis would meet a similar line drawn 
through the upper arm at an acute angle. Otherwise similar to E. exsulans. 
Female is similar to the female of E. exsulans. 
329. Enallagma pallidum Root 
Root ’23, p. 202: Byers ’27, p. 389. 
Length 32-36 mm. Expanse 38-44 mm. Md. and Fla. 
A large, delicate, pale gray-blue, and black species, resembling Teleallagma 
daeckii in coloration and appearance, and Enallagma antennatum in nymph and 
some adult structural features. 
Male. Face pale. A black mid-basal dot on the labrum. Postclypeus pale 
with a dark basal line and two lateral dark stripes or spots. Frons entirely pale, 
except for a dark spot anterior to the median ocellus. Antennae mostly pale or 
with tips light brown. Vertex black, the following pale: a small pair of spots 
anterior to the lateral ocelli, a large lateral spot at the side of each lateral ocellus, 
and a posterior spot between the ocelli. Postocular pale spots very large, angu- 
late, narrowly separated from the pale of the rear of the head, joined or narrowly 
separated from the wide postocellar pale stripe. Prothorax entirely pale except 
for three longitudinal and two transverse stripes on the middle lobe, formed by 
the enlarged median and lateral pale spots so common on the prothorax of 
Enallagma. Thorax with the humeral and middorsal dark stripes very much 
reduced and often light brown in color. A short basal black streak on the second 
and third lateral sutures. Abdomen with the dorsum of 1-7 almost entirely dark 
brown or black. 8-10 entirely blue. Superior appendages widely bifid, the upper 
arm broad, the lower narrow, in profile view. Similar to EL. antennatum. 
Female similar to the male. Humeral stripe ill defined, a brown line the 
entire length of the third lateral suture. The anterior two-thirds of abdominal 
segment 8 has a wide dorsal black stripe. There is a narrow transverse basal 
brown stripe on 9. 
330. Enallagma antennatum Say 
Say ’39, p. 39: Mtk. Cat. p. 54: Garm. ’17, p. 521. 
Syn: fischeri Klct. 
Length 34 mm. Expanse 42 mm. N. Y. and Pa. to Iowa 
This was the first known North American species. Color blue or greenish- 
yellow and black. Found, not commonly, on standing aquatic vegetation and 
seldom goes far from waters edge. Head black above, buff below. Postclypeus 
black, with the pale transverse frontal band above it orange. Pale postocular 
spots narrowly cuneiform and usually connected with each other by way of the 
pale postocellar stripe, seldom narrowly separated from it. Prothorax mainly 
black, with a transverse stripe across the posterior lobe and the sides pale. 
Thorax with wide middorsal and humeral black stripes and consequently very 
