Plate XXXI Y 



Hi/popngia of Chironomus spp. 



Fig. 1. C. Ulinoensi.s, one side. 



Fig. 2. C. nigroviifaius, one side. 



Fig. 3. C. nigricans, inferior process. 



Fig. 4. C. pallidus, one side. 



Fig. 5. C. ohscuratus, one side. 



Fig. 6. C". indisfincfus, superior process. 



Fig. 7. C. indistinct us, inferior process. 



Fig. 8. C. modestus, one side, a, inferior process. 



Fig. 9. C. ahortivus, one side. 



Fig. 10. C. f}iscico7'nis, one side. 



Fig. 11. C. dimorphus, one side. 



Fig. 12. C. dimo?'2)lius, superior process 



Fig. 13. C. cras.sicaudiitiis, lateral view. 



Fig. 14. C. favus, one side. 



Fig. 15. C. ludteralis, one side. 



Fig. 16. C. fulvus, one side. 



Fig. 17. C. plinnosus, apical portion of lateral arm. 



Fig. 18. C. iihhreviatiis, one side and superior process. 



