EXPLANATION OF PLATE. 



Fig. I. — Imago ^ , Pyropsyche tnoncaiinella, rather over twice natural size ; 

 the large specimen figured is 22"5 mm. in expanse. 



Fig. 2. — Neuration of fore-wing of P. moncaimella from camera drawing. 



Fig. 3. — Neuration of hind wing of P. tnoncaiinella from camera drawing. 



Figs. 4 and 5. — Neuration of fore-wings of P. fnoncaunella from camera draw- 

 ings, from two specimens in which a missing vein is partially 

 represented ; Fig. 4 would indicate that the missing vein is 

 vein 5. 



Fig. 6. — A similar example from hind wing, the reappearing vein is probably 

 vein 3. 



Fig. 7. — Fore-wing of Phalacropterix muscclla for comparison, there is prac- 

 tically no portion of 16 between its union with la and its 

 bifurcation, this is, however, represented in some specimens 

 (i« arising from 16, as shown in figure, is a slip in copying). 



Fig. 8. — Hind wing of a variation of neuration in P. muscella. lb is usually 

 simple ; in this specimen it branches not only as in P. moncau- 

 nella, but a second time. On the other side of the same 

 specimen it branches much as in tnoncaiinella. These variations 

 found in a few specimens illustrate the plasticity of the neuration 

 in Psychids. [The wing form in P. angustella (which is hardly 

 congeneric with — atra, H.ey\. = pliiin i/era, Ochs.) is nearest to 

 P. moncaunella of any Oreopsychid, but the neuration is less 

 close than that of P. muscella. It would possibly result from 

 the plasticity referred to that a sufficiency of specimens would 

 bridge over the differences.] 



Fig. 9. — Newly-hatched larva x 13 diam. 



Fig. 10. — Fullgrown larva $ x rather more than 2. 



Fig. II. — Case of J x about |. 



Fig. 12. — Case of cJ x |, pupa-case protruding. 



Figs. 13 and 14. — Two cases ? x about 5. 



Fig. 15. — Male pupa x 3. The dorsal ridges are perhaps a little exaggerated. 



Fig. 16. — Male pupa, abdominal segnu nts 6, 7, 8, 9, and 10 more magnified 

 to show the mounting of dorsal armature on ridges. The re- 

 versed hooks of the inti rsegmental membrane are hardly large 

 enough to show even with this magnification. The ridges end 

 in a point instead of fading out, as shown. 



Fig. 17. — Female pupa X 3. 



Fig. 18. — Skin cast by $ larva on changing to pupa (from camera sketch). 

 The specimen is unusually perfect, and satisfactory for one 

 obtained in this way. The head is crushed, and the ventral 

 aspects of 8th, 9th, and loth abdominal segments are obscure, 

 and there is a fold (on each side unfortunately) which makes 

 the lower lateral plate of the second thoracic doubtful ; for the 

 rest, the sketch gives all the tubercles of the larva, but to make 

 them at all visible, the very minute secondary ones at anterior 

 borders of segments and against spiracles are a little exag- 

 gerated. 



