Fig. 1. 



Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 8. 

 Fig. 9. 

 Fig. 10. 

 Fig. 11. 



Egg of Biwtis posticatus. 

 Embryo, 2 days. 

 Embryo, 4 days. 

 Embryo, 9 days. 

 Head region, embryo, 5 days. 

 Clypeo-labrum, 8 days. 

 Labrum, 10 days, ventral aspect. 

 Labrum, 11 days, ventral aspect. 

 Right mandible, 6yi days. 

 Right mandible, 7 l / 2 days. 

 Right mandible, 9 days. 



Left mandible, 11 days. 

 Hypopharynx, 11 days. 

 Left 1st maxilla, 6 days. 

 Left 1st maxilla, dVz days. 

 Left 1st maxilla, 8 days. 

 Left 1st maxilla, 11 days. 

 Left 2nd maxilla, 6J4 days. 

 Left 2nd maxilla, 7 days. 

 Labium, 9 days. 

 Labium, 11 days. 



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