LAEVAL FORMS OF COLKOPTERA 



Plate 106 



Donaciidae 



A. Donacia sp. 

 B. 



D. Donacia marginata Hoppe 



(Denmark) 

 E. 



G. Plateumaris braccata Scop. 



(Denmark) 

 H. Donacia crassipes F. 



(Denmark) 



X ( ( (t 



J. 



K. Donacia marginata 

 L. Donacia marginata 



M. 



N. 



0. Donacia sp. 



p ti a 



q". " " 



Head. Lateral view. 

 Larva. Lateral view. 

 Head. Dorsal view. 



Labrnm, elypeus, epistoma. 



Tip of antenna. 



Right mandible. Dorsal view. 



Tip of maxilla. Dorsal view. 



Distal part of maxilla ; bl, blade ; 

 lac, lacinia ; sty, stylus. Dorsal 

 view. (Compare pi. Ill G; 

 bl = * ; sty = long seta ) . 



Lacinia with stylus, and galea 

 with blade. Ventral view. 



Maxillary stipes with palpus. 



Mala ; split open. 



Hook shaped eighth abdominal 

 spiracle; showing opened tubes 

 and atrium. 



Hook shaped eighth abdominal 

 spiracle ; intact. 



Longitudinal section of annular 

 fourth abdominal spiracle and 

 closing apparatus; ha, hard 

 fold of closing apparatus 

 ag-ainst which soft fold from 

 opposite wall of trachea is 

 pressed when the closing muscle 

 between the arms is contracted. 



Leg. 



Ventral mouthparts. 



Cross-section of hook of eighth 

 abdominal spiracle; bw, pro- 

 longation from body wall. 



Ventral mouthparts. Dorsal view. 



298 



