8o H. J. VAN CLEAVE 



Explanation of Plate 5. 



Outlines of all figures were drawn from stained mounts in damar with the aid of a 

 camera-lucida. Each of the lines indicating relative magnification has the value of 0,05 mm., 

 except those accompanying figures i and 5 and these have the value of 0,5 mm. 



Rhadinorhynchiis selkirki sp. n. 



Fig. I. Young female showing general body form and arrangement of the body spines. 



Fig. 2. Side view of a single body spine from posterior region of spined area. 



Fig. 3. Profile of a portion of a single longitudinal row of hooks from near the mid region 

 of dorsal surface of proboscis. 



Fig. 4. Profile of hooks from ventral surface of proboscis, individual hooks directly corres- 

 ponding in location to those shown in fig. 4. 



Tegorhynchus brevis gen. et sp. n. 



Fig. 5. Surface view of posterior extremity of gravid female. 



Fig. 6. Profile of hooks from ventral surface of base of proboscis showing the charateristic 



hyaline membrane in which the hooks are embedded. 

 Fig. 7. Profile of hooks from near middle of dorsal surface of proboscis. 

 Fig. 8. Side view of two spines' from near anterior extremity of body proper. 

 Fig. 9. Surface view of a single body spine showing cuticular elevation produced by the spine. 



