About Euphaea cardinalis (Fraser, 1924)
Euphaea cardinalis is a medium-sized damselfly species. Males of this species have a black head and pale grey eyes with a brown cap. Their thorax is black, marked with bright ochreous-red antehumeral and humeral stripes; the base of the thorax's lateral sides is red. All of the male's legs are red. Its wings are broader than those of Euphaea dispar. The fore-wings are transparent, with only a brown tint at the apices, and are roughly the same length as the abdomen. The hindwings are transparent, but the half of the wing closest to the apex is broadly black; this black wing area shows steely-blue reflections in certain lighting. In males, the abdomen is bright red up to segment 6; from the apical third of segment 6 to the final end segment, the abdomen is black, and the anal appendages are also black. Females are shorter and more robust than males; all the ochreous-red markings seen in males are replaced with yellow markings in females. All wings of adult females are transparent with a black tint. The female abdomen is black with yellow lateral stripes extending up to segment 6, and these yellow lateral stripes continue onto segment 7. Segment 8 has a narrow yellow apical annule, and segment 9 has a broad yellow apical annule, both covering the dorsal half. This species breeds in hill streams, and individuals are typically found perching on boulders and riparian vegetation alongside streams.
