340 DRAGONFLIES OF NORTH AMERICA 
black except for the pale anterior lobe. Thorax with broad black middorsal and 
humeral stripes. Abdomen blue, the following black: a basal spot on one; an 
apical spot and ring on 2; at least the apical half of 3; 4-6 except an interrupted 
transverse basal ring on each; basal half to quarter of 7; all of the dorsum of 10. 
Superior appendages black, bifid, the upper arm much longer than the lower, 
without a tubercle. 
The female is like the male except that abdominal segments 7-8 have a 
black dorsal stripe reduced to a line on the basal three-fourths and suddenly 
widened at the apex. 9-10 with the dorsum entirely black. 
340. Enallagma semicirculare Selys 
Selys ’76, p. 517: Mtk. Cat. p. 61. 
Length 32 mm. Expanse 40 mm. Tropic 
This species is not as yet recorded from within the political boundaries of the 
United States, but it may be found along the United States-Mexican border or 
perhaps in tropical Florida. Color, blue and black. Abdomen blue, black as 
follows: a basal spot on the dorsum of 1; a transverse isolated anteapical streak 
or semicircular spot, connected, or not connected, by a “‘tail’’ with the apex of seg- 
ment 2; apical fifth or sixth of 3-4; usually the whole of 5-6 metallic green, except a 
narrow transverse basal ring; 7 almost entirely. 8—10 entirely blue. 
The female is unknown. 
341. Enallagma traviatum Selys 
Selys ’76, p. 521: Mtk. Cat. p. 62: Garm. 717, p. 557 and ’27, p. 81. 
Length 31 mm. Expanse 38 mm. Mass. to Fla. 
Color, pale blue and black. Male. Face pale. Postclypeus with the basal half 
black. Pale transverse frontal band narrow not reaching the basis of the an- 
tennae. Vertex, the antennae and the remainder of the frons, black. Pale post- 
ocular spots small, circular or triangular and entirely surrounded by the black 
of the head. Postocellar pale stripe is vestigial or more often entirely lacking. 
Dorsum of the prothorax black, with a spot on the anterior lobe, two reduced 
lateral spots and the sides of the middle lobe, and a spot or a line on the posterior 
lobe, pale. Thorax with a wide middorsal black stripe. Pale antehumeral stripe 
somewhat wider than the dark humeral, and cut off short at the caudal end, not 
reaching the wing basis. Third lateral suture with a black spot on the end 
followed for the remainder of the suture with a fine black line. A black spot on 
the upper end of the second lateral suture. Abdomen blue, black as follows: 
a basal spot and lateral apical streaks on 1; apical spot and ring on 2; apical 
third to fourth of 3-5; four-fifths of 6; all of 7; a lateral apical streak extending 
half way to the base of 8; none of 9; all the dorsum of 10. Superior appendages 
shorter than 10, bifid, the lower branch square and flap-like, the upper slender 
with the apices turned down. No tubercle present. Appendages resemble those 
of aspersum and culicinorum. 
Female. Similar to the male. The middorsal carina frequently brown. 
Abdomen with a basal dark spot on 1; 4-7 with narrow longitudinal dorsal stripes 
of black, widened suddenly near the caudal margins and narrowed to the meson 
on the cephalic margins; 8 blue with a narrow dorsal stripe on the basal half 
or more; 9-10 blue. 
