PLATE V. 
Fig. 19. Maxilla of adult male. Note the broad, flat lacinal teeth.. 
These act as scrapers in removing the pitch and sticky frass from the 
mandibles while burrowing. Magnified 125 dia. 
Fig. 20. Three brood-burrows which show modification in the manner 
of placing egg-niches due to the egg galleries running closely parallel. 
Gallaries a, b, ¢ show typical arrangement, while d, e, f, g, h and i 
show modifications. This is discussed on page 51. Magnified 2 dia. 
Fig. 21. Portion of a brood-burrow showing striking difference in the 
spacing of the egg-niches at different stages of the egg gallery. Magni- 
fied 2 dia. 
Fig. 22. Dorsal view of adult male. Magnified 50 dia. 
