712 THE PANORPOID COMPLEX, Hi., 



to indicate, by a broken line, a probable origin for these two 

 Orders from the main stem of the Complex a little before the 

 point represented by Belm,ontia. The earliest forms must ob- 

 viously have been of Megalopterous appearance, the Planipennia 

 being a specialisation from the very base of the old Corydalid 

 stem. 



The construction of a Phylogenetic Diagram has been under- 

 taken in this Part, because the only available evidence, in the 

 case of the Fossil Orders, is that of the venation. The lines of 

 descent of the other Orders may have to be modified, when we 

 have considered the evidence which .a study of other parts may 

 bring forward. But, on the other hand, that study will gain 

 much in interest, now that Ave have the results founded upon 

 the wing-venation set out clearly before us. 



Appendix A. 



Note on the Wing-Coupling Apparatus of the Micropterygidae 



{sens. lot.). 



In a short paper in the Entomological News, (26), and also 

 in Part i. of this work (24), I described the wing-coupling 

 apparatus of this group of insects. I now call attention to a 

 correction which I have made in this description, in my paper 

 on these insects recently published (27) . The original descrip- 

 tion of the jugal lobe is true for the Micropterygidae (sens. 

 str.) and for the Mnesarchaeidae, but not for the Eriocraniidae, 

 in which the jugal lobe is of the same type as in the Trichop- 

 terous Bhyacophila. 



Appendix B. (Text-fig. 16, corrected). 



Note on the occurrence of the retinacula in the Lepidoptera 



Heteroneura. 



I am indebted to Dr. A. J. Turner, F.E.S., of Brisbane, for 

 some valuable criticisms of the results contained in Part i. of 

 this research, so far as they concern the structure of the retina- 

 cula in the Heteroneurous Lepidoptera. Dr. Turner points out 

 that the male retinaculum, which I termed radial, is in reality 

 subcostal. The error is mine, and I gladly accept the correction. 

 He also points out that the female retinaculum does not actually 

 spring from the cubitus, but from a position below it, and sug- 

 gests that it be termed the subdorsal retinaculum. This is also 

 correct, and the terminology which he suggests for the two 



