JEarii/ Stages of Albulina -plieretcs. 405 



Plate XXVII. Fig. 21. Prothoracic plate of third stage larva. 



The left filiform (angular special) 

 hair is very distinct, the right one is 

 fainter, its base is 20 mm. (about 

 I inch) to the right, distinct enough 

 when seen, these show the area of the 

 plate, whose hairs are larger but 

 hardly more numerous than in 

 previous instar x 100. 

 22. Honey-gland third instar x 100. The 

 gland, hairs, lenticles and skin re- 

 ticulation are all very distinct. 



Plate XXVIII. Fig. 23. Honey-gland fourth instar x 100. 

 24. Honey-gland fiftii instar x 100. 



Plate XXIX. Fig. 25. Prothoracic plate fifth instar x 100. 



The bases of filiform hairs are 50 mm. 

 (2 inches) apart, hairs directed for- 

 wards. Small hairs with large stel- 

 late bases are numerous. 

 26. Shows character of hairs, a lenticle or 

 two, and especially the skin reticu- 

 lations and points in last instar 

 X 100. 



Plate XXX. Fig. 27. Spiracular region (left) of the sixth 



abdominal segment in last instar 

 X 100, shows lenticles numerous 

 near spiracle. 

 28. Fan area (eighth abdominal segment) 

 last instar x 100, half-way between 

 spiracle and other side of picture. 



Plate XXXI. Figs. 29 and 30. Spiracular regions of fourth 



abdominal segment, to show flat oval 

 plates in intersegmental membrane 

 in front, others occur across the 

 dorsum, fifth instar x 100. The 

 large dorsal intermediate area is not 

 shown, these plates represent muscular 

 attachment. 



Plate XXXII. Fig. 31. Head of larva in last instar x 100 



shows antennae, jaws, and some other 

 mouth parts x 100. 

 32. Left prolegs third abdominal segment 

 last instar x 100. 



Plate XXXIII. Fig. 33. Abdominal segments of pupa x 16. 



