412 Mr. Latter on ihe secretion of Potassium Hydroxide* 
Plate IX. 
Fia. 9. — Dorsal view of part of head of imago of B. calhince : 
b, pointed boss. Actual size 3-47 mm. by 2" 17 mm. 
The corresponding portions of pupa and imago of 
B. lanestris are in all essentials similar to those of 
B. callunce, differing only in being smaller. 
Fig. 10. — Same view of head of pupa of L. testudo : &, pointed 
boss, 0'21 mm. long, 0*40 mm. broad at base. 
Fig. 11. — Front view of head of pupa of L. testudo : b, pointed 
boss. 
Fig. 12. — Dorsal view of head of imago of L. testudo : b, blunt 
boss, 016 mm. long, 0*40 mm. broad at base. 
Fig. 13. — Dorsal view of anterior part of head of H. presinana: 
a, antlia ; m/, muscle (?) fibres ; ^j, maxillary palp ; mw, 
mandible. 
Fig. 14. — Yentral view of same ; a, antlia ; maxillary palp ; 
§, spike formed by rim of eye. 
Fig. 15. — Series of scales from palp, showing transition from 
ordinary form to hair-like form : i, from mid-dorsal 
surface of palp ; ii and iii, from edge and side respec- 
tively ; iv, from ventral surface. 
