腹部细长；翅狭长而透明，弓脉位于第2条结前横脉以外，结后横脉10条或更多，四边室的前边大约为后边长度的1/2或更短；雄性上肛附器较长，下肛附器退化。

Abdomen slender and long. Wings narrow and hyaline, arculus beginning after the second antenodal, postnodals 10 or even more , the upper side of the quadrangle about half the length of the lower or even shorter . Male superior appendages moderately long but the inferiors reduced .