ABBREVIATIONS— Conhnwed 



rt, rectotendoii sn, supratentorint 



s, stipes so, salivos 



sa, subcardo sp, stipula 



sb, scrobe st, supratentoriiur 



sc, scape su, subgusta 



sg, subgalea td, tendon 



si, salivia tm, torma 



sm, submentum v vertex 



PLATE 1 



EXPLANATION OF FIGURES 



1 Blatta orientalis, dorsal aspect of head. 



2 Blatta orientalis, articulation of mandible. 



3 Mantis religiosa, male, dorsal aspect of head. 



4 Mantis religiosa, female, dorsal aspect of head. 



5 Gryllus pennsylvanicus, dorsal aspect of head. 



6 Stenopelmatus sp., dorsal aspect of head. 



7 Orchelimum vulgare, dorsal aspect of head. 



8 Diapheromera femorata, dorsal aspect of head. 



9 Mantis religiosa, female, lateral aspect of head. 



10 Melanoplus difTerentialis, dorsal aspect of head. 



11 Tettix arenosus, dorsal aspect of head. 



12 Anisolabis maritima, dorsal aspect of head. 



13 Blatta orientalis, lateral aspect of head. 



14 Gryllus pennsylvanicus, lateral aspect of head. 



15 Diapheromera femorata, lateral aspect of head. 



16 Diapheromera femorata, articulation of mandible. 



17 Anisolabis maritima, lateral aspect of head. 



18 Stenopelmatus sp., lateral aspect of head. 



19 Melanoplus differentialis, lateral aspect of head. 



20 Tettix arenosus, lateral aspect of head. 



21 Anisolabis maritima, lateral aspect of head, appendages removed. 



22 Orchelimum vulgare, lateral aspect of head. 



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