LARVAL FORMS OF COLEOPTERA 



Plate 20 



Histeridae 



A. Platysoma sp. 



B. Saprinus estriatus Lee. 

 C. 



D. 



E. Teretrius sp. 



F. " " 



G. 

 H. 



I. Hololepta yucateea Mars, 

 J. 



K. Paromalus aeqiialis Say. 



L. Hister unieolor L. (Denmark) 



M. Hololepta yucateea 

 N. Hister unieolor 

 0. 



Q. " 



R. Hololepta yueateea 



Right mandible. Dorsal view. 



Right mandible. Dorsal view. 



Head. Dorsal view. 



Ventral mouthparts. Ventral 

 view. 



Tibia and tarsungulus. 



Ventral mouthparts. Ventral 

 view. 



Head. Dorsal view. 



Right mandible. Dorsal view. 



Larva. Dorsal view. 



Ventral mouthparts with mus- 

 cles (Diagram). 



Leg. 



Vertical longitudinal section of 

 spiracle, closing apparatus, 

 and the epidermal tissues 

 which form these parts in 

 the following larval stage. 

 (Notice the barrel shaped 

 layer of one of the tubes of 

 the next spiracle). 



Thorax. Ventral view. 



Closing apparatus of spiracle. 



Cross section of tubes of bi- 

 forous spiracle. 



Spiracle cut horizontally to 

 show the inner lumen of 

 tubes. 



Spiracle from above. 



Larva. Lateral view. 



12G 



