320 PROCEEDINGS OF THE ACADEMY OF [May, 



Fig. 29. — Evagrus, ventral view of abdomen shortly after reversion; the 

 dotted line in the upper portion of the figure indicates where the cephalo- 

 thorax had been broken off and a part of the abdomen removed. 



Figs. 30-32. — Evagrus, ventral views of abdomina of successive later stages, 

 fig. 32 of an embryo of 19 days (just hatching). 



Fig. 33. — Filistata, ventral view of abdomen of embryo shortly after rever- 

 sion. 



Fig. 34. — Filistata, ventral view of cribellum of adult female, balsam mount. 



Fig. 35. — Dictyna volupis, ventral view of cribellum and tracheal vestibulum 

 of adult female, balsam mount. 



Fig. 36. — Hyptiotes cavatus, ventral view of cribellum of adult female, balsam 

 mount. 



