72 
Psyche 
[March 
Text-figure 10. Stereopterum breve, n. sp. Drawing based on holotype. 
Family Stereopteridae Carpenter 
Stereopteridae Carpenter, 1950, p. 201. 
This family was established on a single species, Stereopterum 
rotundum Carpenter, from the Elmo limestone. Several additional 
specimens of this insect have subsequently been found as well as 
representatives of two other species, described below. In one of the 
latter ( S . breve, n. sp.) the prothorax is seen to be broad, with the 
pronotum extended laterally, but truncate anteriorly and posteriorly. 
Nothing further is known of the body structure in this family. 
The stereopterids were probably related to the Euryptilontidae, 
known from the Lower Permian of the USSR. The prothorax seems 
to be quite differently formed in these two groups and until the hind 
wings are known, it seems advisable to recognize the families as dis- 
tinct. 
