382 PROCEEDINGS OF THE ACADEMY OF [May, 



surface of the leg (figs. 14, 18). Nos. 10 and 11 (figs. 13, 57), like Nos. 

 7 and 8, are paired, and they occur on the ventral surface at the 

 extreme distal end of the tibia. Xo. 10 lies mostly across the first 

 line of articulation (1. 1. a.) with its apex pointing toward the articu- 

 lation. Its shorter slits always face the anterior surface of the leg 

 and it invariably lies between this surface and organ No. 11. The 

 latter organ lies only slightly over the first line of articulation with 

 its apex directed from the articulation. Its shorter slits face the 

 anterior surface of the leg or exactly toward the apex of No. 10. 

 Organ No. 12 lies at the extreme distal end of the tibia on the dorsal 

 surface at the edge of the anterior side. It lies two-thirds across the 

 first line of articulation with its apex touching the second line of 

 articulation (2. 1. a.). Its shorter slits and greater concave side face 

 the anterior side of the leg (figs. 14, 45). Organ No. 13 found on 

 the posterior surface of the metatarsus covers most of the space at 

 the extreme distal end. The slits are transverse to the axis of the 

 leg and they extend around about 120 degrees of the joint. The 

 border is entirely absent. The shorter slits lie on the edge of the 

 dorsal surface (figs. 14, 10). 



The organs on the palps have a disposition similar to those of the 

 legs. Their shape is also similar but the number of their slits is 

 less. Organ No. 1 has only two slits instead of three (figs. 13, 27). 

 No. 2 lying on the ventral surface of the trochanter has only seven 

 slits as compared with 15 to IS found in the same organ on the legs 

 (figs. 13, 26). No. 3 is absent. No. 4 on the dorsal surface of the 

 trochanter has seven or eight slits and its shape is very similar to 

 that of No. 2 (fig. 14). Nos. 5 and 6 have seven slits instead of 

 eleven as on the legs (figs. 13, 14, 38). No. 7 is missing. The shape 

 of No. 8 is more like that of No. 7 of the legs, but its arrangement of 

 slits and disposition correspond to that of No. 8 of the legs. It has 

 only ten slits while on the legs there are twenty-one (figs. 13, 23). 

 No. 9 has the same number of slits as has that organ on the legs, and 

 it is as large as the same structure found on the second and third 

 pairs of legs, it never has any isolated slits (figs. 14, 17). All the 

 other organs on the palps are absent. 



On the anterior and on the ventral extreme distal surfaces of the 

 metatarsus of each leg, there is a single large slit. It may or may 

 not touch the line of articulation and its long axis is not quite parallel 

 with the axis of the leg (figs. 13a, 146, 31). On each the anterior and 

 dorsal surface of all the legs and palps there is a transverse single slit 

 near the distal end of the tarsus (figs. 13c, 14c/, 32a, b, c). On the 



