402 The University Science Bulletin. 



PLATE XLII. 



Fig. 3. Side view of May-fly nymph, showing the chironomid pupa under 

 the wing pads. 



Fig. 4. Young larva of T. equitans under the wing pads of the nymph. 

 Fig. 5. Full-grown larva on the nymph. 

 Fig. 6. Pupa on the nymph. 



