59 



PERIPLANETA 



8. The 3rd post-oral pair of appendages or 2nd maxillae (labium and labial palps). Submentum ; 

 mentum ; bifid ligula ; paraglossse ; labial palp. 



[N.B. For preparations of insect mouth parts, the detached appendage should be boiled with potash to remove 

 attached muscles, dehydrated and mounted in Canada balsam.] 



9. One of the 2nd post-oral pair of appendages or ist maxillae. Cardo; stipes; palp; lacinia 

 galea. (Compare with 8 and with mandible and maxillae of Crayfish.) 



10. One of the mandibles. 



ii. Enlarged view of the two thoracic stigmata of one side placed between prothorax and meso- 

 thorax, and between mesothorax and metathorax. 



