Neuration of the Wings of American Tineina. 195 



in part), and in such cases, when Dr. Clemens has not given figures of 

 the neuration, I have given them in the following "Illustrations" for 

 the purpose of establishing the identity of the genera. 



I have also met with many new generic t3^pes, illustrations of the 

 neuration of which are here first given. In some cases I have given 

 illustrations of the neuration of more than one species belonging to a 

 genus, even when illustrations of that of other species of the same 

 genus have already been given by Mr. Stainton or Dr. Clemens, for the 

 purpose of showing the differences in the neuration of species at pre- 

 sent referred to the same genus. 



Entomologists differ as to the value of the neuration of insects for 

 the purpose of classification. The value differs no doubt in different 

 orders, or even in families of the same order. In the Tineina I have 

 derived more aid from it than from any other single character, though 

 of course the tout ensemble of a species must be considered in rightly 

 determining its systematic location, and it is frequently necessar}', or 

 at least best, to know its entire history. Among the Tineina it some- 

 times happens that two allied species of a genus have the same neura- 

 tion, though usually slight differences may be observed even between 

 closely allied species-; and minute differences (such as the point at 

 which a vein bifurcates) may be detected even between different speci- 

 mens of the same species. The neuration is, however, chiefl}^ valuable 

 in determining generic and family relationship of species. No species 

 of the family Exajoatidfe, Sta., has yet been observed in this country. 

 Among Tineidoi there are several species that I can not refer to any of 

 the European genera that are known to me. The neuration of Hypo- 

 iiomeutidce is sufficiently illustrated in Ins. Brit., \. 3. Pluteloptera 

 is our only new genus of Plutellidce. It was to be expected that in so 

 comprehensive a familj^ as the OelechidoR, many new generic forms would 

 be found in this country'. Some that I have made the types of new 

 genera, as e. g., Cirrha platanella, CEseis bianulella, Eido alhapalpella 

 and Glance pectenaloeella, will by many no doubt be referred to 

 Gelechia, a confused assemblage of species whicli can hardly be con- 

 sidered a genus. I give no figure of the neuration of an}'^ species of 

 Argyresthidce, because we have no new genus belonging to that family. 

 Of the familjr Gracilariidoi, I give illustrations of four species of Gra- 

 cilaria, not because they differ essentially from any of the species of 

 that genus already known, but simply to show what differences obtain 

 in the neuration of the several species, and to establish the fact that I 

 have elsewhere asserted that Parectopa of Clemens is Gracilaria, in 

 part. No new genera of Coleophoridoi have been discovered in this 



