BY R. J. TILLYARD. 101 



Curtis, for the genus Micropteryx, by a considerable number of 

 authors, amongst whom we may mention Packard, Chapman, 

 and Meyrick in their earlier works, as well as Sharp in the 

 " Cambridge Natural History," following these. The name 

 Micropteryx was then applied wrongly to Eriocrania, by those 

 who used Eriocephala for Micropteryx itself. One has, therefore, 

 always to bear in mind, that, in works where the names Erio- 

 cephala and Micropteryx are used to contrast these two very dis- 

 tinct generic types, Eriocephala should be correctly Micropteryx, 

 and Micropteryx correctly Eriocrania. 



The subdivision of the family Micropterygidcr into two separate 

 families, Eriocephalidce and Micropterygidae, corresponding with 

 the two subfamilies Micro pterygium and Eriocraniince as defined 

 by Meyrick, was first proposed by Chapman in 1894(1); this 

 arrangement was followed by Sharp in 1909(8), though not by 

 Meyrick in 1S95(6). In this latter year, Packard (7) emphasised 

 the primitive condition of the mouth-parts in Micropteryx (which 

 he called Eriocephala) by his division of the Order Lepidoptera 

 into two Suborders, Lepidoptera Laciniata (or Protolepidoptera), 

 containing only Micropteryx, and Lepidoptera Haustellata, con- 

 taining all the rest, including Eriocrania (which he calls Micro- 

 pteryx). He further emphasises the difference between Erio- 

 crania and the remainder of the Lepidoptera Haustellata, by 

 dividing this Suborder into two series, of which the first, or 

 Pakeolepidoptera, contains only the Eriocrauiida', while the 

 second, <>r Neolepidoptera, contains all the rest. 



Tn 1917, Chapman (2), as already stated, raised the genus 

 Micropteryx to ordinal rank, with the title Zeugloptera, on the 

 characters mentioned by Packard, together with the new char- 

 acter emphasised by him, that the female of this genus possesses 

 only a single terminal genital opening in the tenth abdominal 

 segment, whereas all other Lepidoptera possess only nine seg- 

 ments in the female, and have two genital openings, one in the 

 eighth segment for pairing, and a terminal one for oviposition. 

 He says : - " It remains difficult to suggest that Micropteryx has 

 any lepidopterous character except the possession of scales. The 

 neuration is also, perhaps, primd facie, lepidopterous; but both 



