59 



the true Psychids, but is a separate culmifiation. On the other 

 hand Melasina appears to be on the line of developeraent of the 

 true Psychids, despite its winged $. The intermediate stages, at 

 about the level of Fumea are unknown to me. 



We hâve still much to learn on thèse matters. The mutations- 

 theory probably has some hght to throw on some difficult détails, 

 such as where, for example, a particular form appears to hâve 

 equally descended from two others, though in fact it can only bave 

 descended from one of them. The relationship to the other being, 

 probably, that they are both the resuit of similar mutations at 

 différent heights on the main stem. 



The true Psychidœ are a tolerably definite group, and no one can 

 be blamed for pinning his affections to them and discarding ail 

 their relatives. It remains true, however, that the micro-psychids 

 and the Tineœ related to them form with the true Psychids, a stirps 

 of common origin, separate from any other division of the 

 Lepidoptera. 



