'84 
Psyche 
[June 
Orthoptera (Saltatoria and Grylloblattids) 
Dermaptera 
Cheleutoptera (Phasmids) 
Superorder Panplecoptera (Plecopteroid insects) 
Orders Protoplatyptera Hadentomoidea — fossil) 
Platyptera (Embiids) 
Plecoptera 
The Plecopteroid and Orthopteroid insects were descended 
from Protort hopteroid forebears which arose from the Proto- 
blattoid ancestors of the Isopteroid insects, so that the ancestral 
types in the common Protorthopteran-Protoblattid stem gave 
rise to the lines of descent of the Isopteroid, Orthoptero d, and 
Plecopteroid insects which comprise the Orthopteroid nsects in 
the broad sense of the term The Palaeorthoptera such as Synar- 
moqe, serve to connect the common Protorthopteran-Protoblattid 
stem with the Palaeodictyoptera, wh’ch are very like the ancestral- 
types giving rise to the winged insects in general. 
Literature referred to in this paper. 
Crampton, G. C. 
1915. Thoracic Sclerites and Affinities of Grylloblatta. Ent. 
News, 26, p. 337. 
1917. Antennae o Grylloblatta and Embiids. Canadian Ent., 
1917, p. 213. 
1917. Ovipositor of Grylloblatta and Related Insects. Jour. 
New York Ent. Soc., 25, p. 225. 
1917. Lateral Head and Prothoracic Regions in Grylloblatta 
and Related Insects. Ent. News, 28, p. 398. 
1922. Evolution of Insects Indicated by the Venation. Can- 
adian Ent., 1922, p 206. 
1923. Maxillae of Grylloblatta and Related Insects. Jour. New 
York Ent. Soc., 31, p. 77. 
1924. Phylogeny and Interrelationships of Insects. Jour. Ent. 
Zool., 16, p. 33. 1926. Sclerites of Grylloblatta and 
Other Insects. Trans. American Ent. Soc., 61. 
Imms, A. D. 
1925. Textbook of Entomo’ogy. 
