294 DRAGONFLIES OF NORTH AMERICA 
Male.—Color pale gray or brown and black. Face pale with a black spot at 
the base of the labrum and another and larger one at the base of the postclypeus. 
Pale transverse frontal band wide, reaching to the basis of the antennae and 
interdigitating with the black of the vertex on either side of the median ocellus. 
Top of head black except for spots on either side of the lateral ocelli, a pale post- 
ocellar stripe, and obscure pale postocular spots. Dorsum of the prothorax black 
except for a stripe on the anterior lobe, a pair of large lateral spots on the median 
lobe, and the sides of the posterior lobe which are pale. Sides of the median lobe 
pale. Thorax (fig. 289) predominantly black with wide middorsal and humeral 
dark stripes, which are twice as wide as the pale antehumeral stripe. A black 
line on the caudal end of the second lateral suture and another covering the third 
lateral suture. Abdomen predominantly blue, black as follows: a basal spot on 
the dorsum of 1; two small preapical spots and a fine preapical ring on 2; apical 
third or less of segments 3-6; apical five-sixths of 7; none of 8-9, sides inferiorly 
of 10. 
Female.—Head and thorax as in the male. Abdomen with the dorsum of 
4-7 and 9-10 brown or black except for narrow interrupted basal rings on 4-7. 
Sides of 1-5 as in the male, 6-10 mostly black. Segment 8 blue on the dorsum. 
279. Argia emma Kennedy 
Kndy. ’15, p. 271. 
Length 35-37 mm. Expanse 46-54 mm. Wash. 
Male.—Labrum, clypeus, frons, vertex, postocular area and occiput, rich 
violet. Genae lighter almost pinkish. Antennae black. A black line connecting 
each antennae with the median ocellus. A black T-spot extending forward from 
the median ocellus. The ocellar area black with large pale spots. Postocular 
area narrowly edged with black posteriorly. Prothorax pale the median lobe 
with two heavy median and two fine lateral longitudinal stripes of black, the 
emna fumipennis 
stripes joined by a fine brown transverse line across the anterior and posterior 
border of the middle lobe. Thorax predominantly pale. The dark middorsal 
stripe very narrow, not a fourth as wide as the pale antehumeral stripe. Humeral 
suture black as follows: a rectangular black spot below its anterior end from 
which a broad line extends dorsal to its middle point, where it tapers to a third 
of its previous width, extending thus narrowed to the dorsal fourth where it 
abruptly widens for the remainder of the extent of the suture. A black spot 
on the caudal end of the third lateral suture followed by a black line, also a short 
black line on the second lateral suture. Abdomen. Segment 1 pale violet with 
the sides and sternum brown overlaid with pruinose. Segments 2-7 violet, black 
as follows: 2, with a large lateral spot and narrow apical ring; 3-6 with a narrow 
line along the ventral edge of the plurite connected with an apical ring occupying 
