EXPLANATION OF PLATE 17. 



Fig. 1. Helicostyla cincinniformis lubanensis Clench and Archer. Holotype 

 M. C. Z. no. 79166. 



Fig. 2. Helicostyla cincinniformis tritaeniata Mllf. 



Fig. 3. Helicostyla cincinniformis Sby. 



Fig. 4. Helicostyla cincinniformis ultima Clench and Archer. Holotype, 

 M. C. Z. no. 79169. 



Fig. 5. Helicostyla cincinniformis demesana Clench and Archer. Holo- 

 type, M. C. Z. no. 79171. 



Fig. 6. Leptopoma, kejong Clench and Archer. Holotype, M. C. Z. no. 

 47224. About l}4 X. 



Fig. 7. Cyclophorus reevei lubanicus Clench and Archer. Holotype (lower 

 figure), M. C. Z. no. 47221. About 1H X. 



