About Aciagrion occidentale Laidlaw, 1919
This species is a long, slender damselfly. Males have a black marking within blue coloring on the eighth segment of the abdomen. The thorax is black, marked with lateral azure blue stripes. The abdomen is extremely slender: the dorsal surface of segments 1 through 7 is black, and the lateral sides are light blue. Segment 8 is blue with a narrow triangular black dorsal spot, while segment 8 is entirely blue. Segment 10 is black on its dorsum and blue on its sides. Females are similar to males, but differ in the coloration of their last three abdominal segments. In females, segment 8 has a broad black mark on the dorsum, segment 9 has a small basal dorsal spot, and segment 10 is entirely blue. This damselfly flies close to the ground, and is found in shrub-dominated wetlands. Despite its delicate build, it migrates by rising high into the air and using its lightweight to take advantage of air currents.
