This specimen (caught on cedar elm) is very similar to Peripsocus stagnivagus. The phallosome, visible through the abdominal wall is shaped like Fig. 725 (Mockford, 1993). The wing venation and pigmentation are almost identical except that the darker spots along M2 and M3 (Fig. 724) are not evident here. Mockford mentions that "This species is very close to an undescribed species in central Mexico and a second undescribed species in southern Mexico" (p. 215). In addition Mockford told me that males of P. stagnivagus are rare. So, all I can say for sure is that this specimen might be P. stagnivagus. I could send the specimen to him and see what he says.