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XI. On the Genus Imma, Walk. ( = Tortricomorpha, Feld.) 

 By E. Meyrick, B.A., F.R.S. 



[Read May 2iid, 1906.] 



The interesting genus, which is the subject of the present 

 paper, has been the object of so much misapprehension and 

 redescription, that it seemed worth wliile to clear up the 

 generic synonymy, give a classified list of the described 

 species, and describe the additional material which I 

 possess, so as to bring the whole up to date. This I have 

 done to the best of my knowledge, but authors have found 

 the species so puzzling, and have referred them to such 

 unexpected quarters, that I can hardly hope not to have 

 overlooked some. I should be glad to be informed of any 

 omitted. The authorities of the British Museum have also 

 submitted to me their unworked material, containing many 

 interesting forms. 



The true location of the genus is unquestionably amongst 

 the Plutellidfe. There is a group of this family in which 

 the cilia of the hind-wings are commonly (though not 

 invariably) relatively shorter in proportion to the breadth 

 of the hind-wings than in any other Tineina, and the 

 antennae are also short ; and it is to this group that Imma 

 belongs. The group is more especially characteristic of 

 the Indo-Malayan region, but Brachodes {Atychia) and 

 SimaetJds are familiar European exponents. Recent writers 

 have usually admitted the genus to belong to the Tineina, 

 but have referred it to the Gelechiadm or Xylorydidie, from 

 both of which it is immediately separated by the posterior 

 tibiae being smooth above, whilst in those families they are 

 clothed with long hairs ; moreover, as explained below, the 

 forms with veins 7 and 8 of the fore-wings separate are 

 generically inseparable from those with 7 and 8 stalked, 

 and the former would be wholly inadmissible into either of 

 these families as now understood. Further the labial 

 palpi are quite different from the slender acute sickle- 

 shaped type which is characteristic of those families and 



TRANS. ENT. SOC. LOND. 1906. — PART II. (SEPT.) 



