Species petechialis (Muttkowski, 1911) [Tetragoneuria]
This southern species has a relatively slender abdomen. Some individuals have a distinct row of brown spots on the antenodal crossveins in the hindwing, extending out to the nodus. These individuals are easy to identify. In others, these spots may not be as prominent. The slender abdomen is slightly constricted behind the 3rd segment in males. The male cerci are slightly divergent and lack sharp angulation downward, when viewed latera lly. The female caudal appendages are approximately 2 mm long.
Total length: 41-43 mm; abdomen: 30-34 mm; hindwing: 27-31mm.
This species is nearly identical to Stripe-winged Baskettail (E. costalis ) and is considered by some to be a form of that species. The clear-winged individuals may not be reliably distinguished from Stripe-winged Baskettail in the field. Differences with other species are given in the similar species accounts under that species.
Lakes, ponds and slow reaches of streams and rivers.
This species flies later in the year than the other species. It may be common along forest edges or in more open areas, where both clear and spotted-winged forms may be found.
Colorado, Kansas, New Mexico, Oklahoma and Texas.