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Fig. 36. 2. stage. Pharyngeal skeleton, ^^/i. 



- 37. - - Anterior spiracles, ^^^/i. The letters as 



in fig. 15. 



- 38. 3. - Anterior spiracles, ^^^/i. The letters as 



in fig. 15. 



- 39. - - Posterior spiracles, ^^'i. sa. as in fig. 18. 



Ocyptera hrassicaria F. 

 Fig. 40. 1. stage. Pharyngeal skeleton, '-^"/i. The letters as 

 in fig. 11. 



- 41. 2. - Pharyngeal skeleton, ^^^/i. 



- 42. - - Posterior spiracles, -^^/i. The letters as 



in fig. 15. 



- 43. 3. - Pharyngeal skeleton. '^'Vi. 



Undetermined parasite in Lithobius sp. 

 Fig. 44. 3. stage. Anterior spiracles. 



- 45. - - Posterior spiracles. **^^'i. 



Fl. III. 



Ptychomyia selecta Meig. 

 Fig. 46. 1. stage. Part of the armature of spines with single 

 large spines. ^^*'/i. 



- 47. - - The eggshell (æ) and the chitinous funnel 



surrounding the hole (ih) through which 

 the parasite has penetrated. *^/i. 



- 48. 2. - Spines on the hind margin of a segment 



pointing forwards (a) and spines on the 

 fiont margin of the following pointing 

 backwards (b) ^^^l\. 



- 49. 3. - Posterior spiracles; a. normal with 3 respi- 



ratory areas, b. abnormal with only 2 areas. 

 *^^/i. sa. as in fig. 18. 



Bactromyia aurulenta Meig. 

 Fig. 50. 3. stage. Part of the armature of spines from the 

 last segment, -^^/i. 



