240 CALIFORNIA ACADEMY OF SCIENCES [Pkoc. 4th Ser. 



Family SCENOPINIDiE 



Fig. 18. Scenopinus fenestralis Linnaeus 



The name "window flies" is often applied to the members 

 of this family because they are frequently found in houses 

 on the windows. The adults are small, slender, and rather 

 flattened; the wing membrane is smooth and there are two 

 veins from the discal cell. 



The larvae are closely allied to those of the Therevidae 

 and are predaceous. The larvae of Scenopinus fenestralis 

 are found in rotten wood and fungi, and under carpets in 

 houses, where they feed on the larvae of the "moths". 



231. Scenopinus fenestralis (Linn.) 

 Forest Grove, VIII-20 (Cole). 



