762 'bulletin united states geological survey. 



ifEUEOPTERA. 

 Family Phrtganid^. 



Fhryganea operta. — A single well-preserved specimen with its reverse; 

 tbe wings are doubled beneath the body, and unfortunately are overlaid 

 by the larva skin of a Dipterous insect, obliterating all the important 

 parts of the neuration. The portion that remains resembles that of 

 Ooera, but it is impossible to determine with any certainty, while the 

 structure of the autenngB is more as in Phryganea proper. The head is 

 detached from the body, and faint traces of the antennae are preserved, 

 but detached; a single pair of spurs show at the end of the tibise, and 

 the spines of the under edge of the same tibite are alternately long and 

 short. The abdomen is very well preserved on a side view. Length of 

 body S""™; (portion of) antennae 7"""; tarsi 3.5™'"; wings 10™™. Chagrin 

 Yalley. 



