322 Habits of the Greenhouse White Fit/ 



in the male, situate in the second, third, fourth and fifth abdominal 

 segments. The meal has a peculiar structure, being in the form of 

 spirals or parts of spirals, as if it had been forced through small 

 openings (Fig. 43). In thin sections (Fig. 44), taken through the 

 region of these wax glands, there is seen a single layer of secreting cells 

 with large nuclei, and containing vacuoles from which the wax has 

 been dissolved during preparation. There are also numerous granules 

 which are more numerous towards the exterior. The overlying chitin 

 at first appears to consist of a series of imbricated plates, which effect, 

 however, is due to the presence of small pores, thus giving the chitin 

 that striated appearance. 



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Fig. 43. Wax threads. Fig. 44. Section through wax glands. 



[In order to determine with certainty the structure of the chitin, 

 special precautions as to lighting, to prevent error from reflection or 

 aberration, were found to be necessary, because of the high magni- 

 fication required.] 



Antennae (Fig. 45). Each antenna consists of two broad segments 

 at the base and five longer and more slender ones. They are placed 

 just in front of the eyes, and show pseudo-segmentation. On each 

 of the third, fifth and seventh segments, situated on their distal ends 

 and on the dorsal (anterior) side, is a circular pit fringed by setae. 

 These are probably olfactory organs. The seventh segment terminates 

 in a fine point. The length of the antenna is 0-36 mm. in the male, 

 and 0-32 mm. in the female. 



