ON PSYCHOPTEBA PALUDOSA. 77 



EXPLANATION OF PLATE IX. 



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Fig. 1. — Larva of Psychoptera paludosa, slightly magnified (Lyonet). 

 The inflated tracheae extend from A. to B. 



2. — Respiratory tail of larva, more highly magnified. B. C. , pen- 

 ultimate segments; 1). I)., styliform appendages; E.^ 

 convoluted tracheae ; F. F., muscles (Lyonet). 



3. — Pupa, slightly magnified, showing the respiratory filament 

 arising from the thorax, and the folded wings and legs 

 (Lyonet). 



4. — The perfect insect, natural size (Lyonet). 



5. —Head of the larva, from beneath, mx. , maxillae ; mx}). , 

 maxillary palpi ; Ir. , labrum. 



,, 6. — Portion of one of the main tracheae, showing two segmental 

 swellincfs, 



7. — Section of ditto, across x x. a. a., longitudinal furrows. 



8. — A few of the spiral fibres of tracheae, showing the thinning- 

 out of the fibres at a. a., and the thickened sides of the coil. 



9. — Portion of the alimentary canal, extending from the proven- 

 triculus to the anus. 2^-5 ^^^^ proventriculus ; c, its Ci«ca ; 

 s., the stomach; si., the small intestine; IL, large intes- 

 tine, or colon. 



9a. — Section of proventriculus, showing intus-susception of oeso- 

 phagus. 



10. — Caeca of proventriculus. 



11. — Limbs of pupa, seen through thoracic integument of larva. 

 I. I. I. , legs ; IV. w. , wings. 



12. — Head and thorax of pupa, seen from the side. /. , base of 

 respiratory filament ; / , its aborted fellow ; a. , antennae ; 

 lb., labium; (p., labial palp; I. I., legs; tv., wing; /i. , 

 haltere. 



13. — Central portion of respiratory filament, with bladder-like 

 elevations. 



13a. — Portion near the extremity. 



14. — One of the elevations from the central portion of the fila- 

 ment, side view, v., horny ring; c. c, external coils; 

 t., trachea. 



15. — Ditto from terminal portion, m., membranous continuation 

 of external wall ; f. , fibres of trachea. 



16. — Terminal toothed crown of filament. m., membranous 

 external wall. 



17. — Aborted filament, showing at x the constricted extremity of 

 the trachea. 





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