ENALLAGMA 323 
with its bright blue and black. Male. Face blue. Postclypeus black. Pale trans- 
verse frontal band reaching the basis of the antennae. Vertex, antennae and the 
remainder of the frons black. Pale postocular spots wide, cuneiform, and entirely 
surrounded by the black of the head. Pale postocellar stripe vestigial. Anterior 
and posterior lobes of the prothorax mostly pale. Middle lobe black on dorsum, 
with two lateral spots and sides pale. Thorax with the usual wide middorsal and 
humeral black stripes, and the pale antehumeral stripe. Remainder of the thorax 
pale. M, arising between the 4th and 5th postnodal cross veins in the fore wings, 
the 8rd and 4th in the hind. Abdomen blue, black as follows: a basal spot on 1; 
an apical ring and spot on 2; spots on the apical third to fourth of 3-5; half of 6; 
nearly all of 7; the dorsum of 10. 8-9 entirely blue. Superior appendages shorter 
than 10, simple, not bifid. The inferior appendages longer than the superiors. 
The female is colored a yellow-green and black. Head and thorax like the 
male. Abdomen with segments 1-10 black except the lateral surfaces and an 
apical ring on the first; lateral surfaces of 2-10, and interrupted basal rings on 
3-6 inclusive, which are pale blue or greenish. 
308. Enallagama boreale Selys 
Selys ’75, p. 242: Mtk. Cat. p. 55: Garm. 717, p. 525 and ’27, p. 65: Walk. ’24. 
pi l73: 
Syn: calverti Morse 
Length 33-35 mm. Expanse 42-46 mm. Northern U. S. and Canada to Pa. 

A common damselfly of the blue-black group. Male with the head buff below. 
Postclypeus black, except for the lateral margins. Pale transverse frontal band. 
Vertex, antennae and the remainder of the frons black. Postocular spots large 
and isolated, entirely surrounded by black. Prothorax mostly black, with the 
anterior lobe, two large lateral spots and the sides of the middle lobe, and the 
posterior margin of the hind lobe pale. Thorax with a wide middorsal black 
stripe (sometimes divided by a fine blue line), a wide antehumeral blue stripe, 
and a narrow black humeral stripe. A black basal spot on the third lateral suture 
extending usually only one-third to one-half the distance to the bases of the 
posterior legs, but occasionally being prolonged into a fine line that reaches the 
entire distance. M: arising between the 5th and 6th postnodal cross veins in the 
front wing, and between the 4th and 5th in the hind. Abdomen blue with the 
following black: a basal spot on 1; an apical spot and narrow ring on 2; an apical 
spot connected with an apical band on 3-4; apical third of 5; two-thirds of 6; 
five-sixths of 7; and all of the dorsum of 10. Superior appendages black, short, 
one-third as long as 10, blunt, and with no tubercle. 
Female similar to the male. Abdomen with the first segment as in male, 
2nd with the spot connected with the apical ring and a line on the meson to the 
