One of two Nearctic species listed at Nearctica.com.
Males have a bright red abdomen that is essentially unmarked with black. On the dorsal surface of the thorax are two black marks shaped like the numeral "1."
Females are dull red to brownish yellow but otherwise like the males.
Not found in Canada. In the United States, this species is most common along the Atlantic and Gulf coastal plains. Its known localities stretch from Texas to Illinois, and from Delaware to Florida. Westfall and May indicate no records from Mexico or the Greater Antilles.
This species prefers to perch on Duckweed, and may also be found on other floating plants in ponds, lakes, and sluggish streams.
In Florida, found from March to November.(1)
Very similar to T. salvum (which is also listed as T. salva). The easiest way to separate these two species is by range, since T. salvum is southwestern and T. byersi southeastern.