120 ELEMENTARY LESSONS ON INSECTS 



5. Collect some mosquitoes — no trouble to find them on 

 a warm evening. 



6. Collect mosquito larvae with a dip net from tempor- 

 ary pools. 



7. Collect midges from some of the cloudlike swarms 

 that appear above the marshes at nightfall. Larvae (Fig. 

 8B) of some of them (easily recognizable when alive by 

 their figure-of-8 swimming) will usually be collected along 

 with mosquito larvae. 



8. Collect some craneflies with a net as, on approach, 

 they rise from the vegetation of the low meadow. 



9. Collect some big cranefly larvae from leaf-drifts in 

 a wood-land stream. Hold a screen in the water below the 

 obstruction. Disturb the accumulated leaves, dislodge 

 the larvae driven down by the current, and they will lodge 

 on the screen. Lift it and pick them off. 



10. Prepare slide mounts of the wings and antennae of the 

 flies studied. 



11. Prepare slide mounts of the mouthparts and spiracles 

 of a maggot. 



12. Prepare slide mounts of some of the smaller larvae of 

 mosquitoes and midges. 



13. If dried specimens are to be used for study, give them 

 an overnight stay in the relaxing jar. 



14. Pin and mount and label for the collection a variety 

 of representative Diptera. 



15. Home problems on crop pests (see p. 174). 



16. Routine (see p. 204). 



