LARVA OF TANYPUS MACULATUS. 87 



EXPLANATION OF PLATE YIII. 



Fig. 1. — Stylaria paludosa, showing incipient division of the body at x 



,, 2. — Portion of the body, shoAving the constriction more advanced ; 

 the new setce, and the formation of new proboscis and eye. 



,, 3. — Head of new worm just detached, showing imperfect mouth. 



,, 4. — Head of original worm, showing mouth fully formed. 



, , 5. — Blood-corpuscles. 



,, 6. — Hooked seta. 



7. — Larva of Tanypus maculatus : — sg, salivary glands ; c, crop ; 

 p, iDroventriculus ; v, ventriculus, or stomach ; bt, biliary 

 tubes ; i, intestine. 



8. — Head of larva: — cia, antennae; Z, labium ; m, muscles; t, 

 trachea. 



9. — Eggs of Tanypus maculatus. 



10. — Anal foot. 



11. — Nervous chain from young larva. 



12. — Hooklet of anal foot. 



13. — Egg, front view. 



14. — Ditto, side view. 



15. — Ditto, more advanced, showing alimentary canal (a), and 

 segmentation of body. 



16. — Young larva, a day old. 



17. — Pyriform cells attached to maxilla. 



18. — Thoracic segments of worm, shewing — sg, the salivary 

 glands, and dd, the imaginal discs. 



19. — Root of antennae, with muscle and sac attached. 



20. — Mouth-organs, etc. : — aa, antennae ; imn, mandibles ; mW, 

 maxillae. 



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