Fo.tsom. — Development Anurida. 
PLATE 6. 
30. Transverse slightly oblique section of head at Stage 8.  X 480. 
. Dorsal aspect of left mandible of adult. > 150. 
. Dorsal aspect of anterior extremity of adult right mandible. X 480. 
. Dorsal aspect of skeletal structure of internal mouth-parts in situ. XX 160. 
. Dorsal aspect of head of left maxilla in adult. Xx 480. 
. Surface view of finished labrum. > 150. 
. Head of adult insect viewed from the left side. X 150. 
