lofi CEYLON PEARL OYSTER REPORT. 



EXPLANATION OF PLATE. 



Halobates herdmmi, male, dorsal view, x 8. 

 female x 8. 



male, left feeler (terminal segments), x 20. 



,, female, right ,, x 20. 



,, male, apex of shin, with tarsal segments. Upper aspect, x 40. 



>i )> ii Lower x 40. 



a, "file," b, "comb" of stridulating organ. 

 male, " file " of stridulating organ, x 250. 



"comb" x250. 



,, female, apex of shin, with tarsal segments. Lower aspect, x 40. 



a, " file," 6, " comb " of stridulating organ. 

 ,, female, " file " of stridulating organ, x 250. 



male, tip of proximal tarsal segment with distal segment of intermediate 



leg. x 40. 

 male, tip of shin with tarsal segment of hind leg. x 40. 



,, ,, dorsal view of " genital " segments, x 40. 



,, male, ventral view of abdomen, showing hinder edge of thoracic sternum 



and coxa of left hind leg. x 40. 

 ,, 15. male, 8th abdominal segment isolated and viewed obliquely from the 



ventral aspect, x 40. 



ii 16. ,, female, dorsal view of end of abdomen with extended ovipositor, x 40. 



< 17. lateral ,, ,, x 40. 



LS. ventral x 40. 



ii 19. ,, lateral view of retracted ovipositor, as seen after removal of the 



lateral sclerites of the 8th segment, x 40. 



In figs. 16 to 19: a, lateral sclerites of 8th abdominal segment; b, intersegmental membrane; c, genital 

 aperture ; c\ " hood " in front of ditto ; d, triangular, and il l , slender sclerites of 8th sternum ; e, anterior 

 gonapophyses ; e\ slender internal limb of ditto ; /, sclerite of 9th abdominal segment ; g, outer posterior 

 gonapophyses ; h, inner posterior gonapophyses ; i, membrane extending between gonapophyses ; j, 10th 

 abdominal segment ; To, anal segment. 



