191o] Ilelico psyche Molannidce and Leptoceridce 73 



It is interesting to note that there are some other characters 

 not found in the Sericostomatidae which Hehcopsyche shares 

 with genera of other familes. Thus it has the costal hooks on 

 the hind wings which are found well developed only in the 

 Leptoceridae, Molannid®, and the Macronematinse (Hydro- 

 psychidae) . I find also that //. borealis has the peculiar fenes- 

 trated terga in the posterior abdominal segments heretofore 

 found only in certain species of Oecetis — a genus of Leptoceridae. 



Taken altogether the facts presented do not do more than 

 emphasize the isolated position of the Helicopsychinas and sug- 

 gest that this subfamily may be regarded as an early offshoot 

 from the Leptocerid stem which in the condition of the palpi 

 has diverged from the typical form in the same way as have 

 the Sericostomatidce. 



