PLATE XXVII. MlCROPHOTOGRAPHS. 



Fig. 23. Cross-section of head of subimago of male C. hageni. 



Fig. 24. Cross-section of a head of adult male C. hageni. 



Fig. 25. Cross-section of head of subimago of male C. calif ornica. 



Fig. 26. Cross-section of male adult of C. califomica. 



Fig. 27. Cross-section of part of large turban eye of an adult male C. hageni, 

 showing the connecting strands between the proximal and distal 

 retinula;. 



Fig. 28. Microphotograph of cross-section of head of an old nymph of .S. 

 corrupta, the adult of which was about to issue. The section 

 passes through the edge, only, of the pigmented part of the eye 

 which in its largest part was about equal to the upper large facetted 

 area as is shown by the size of the optic ganglion. 



Fig. 29. A few ommatidia from the dorsal eye of a female B. capitata. 



Fig. 30. Left dorsal and lateral eyes of a female B. capitata showing optic 

 ganglion also. Most of the cornea of the dorsal eye is torn away. 

 See Fig. 29. 



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