1918] Crampton — Study of Terga and Wing Bases 11 



1914b. Crampton — On the Misuse of Terms, etc. Jour. N. Y. 

 Ent. Soc. 22, p. 248 — (Parategiila shown in Fig. 4). 



1916. Crampton — Phylogenetic Origin of the Wings, etc. Ibid., 

 24, p. 1^ — (Tergiim and wing base of Plecopteron figured) . 



1917. Pantel — A proposito de un Anisolabis alado. jNIem. 

 Real Acad. Ciencias y Artes, 14, p. 3 — (Numerous figures of 

 terga and wing bases of Dermaptera). 



1908. Snodgrass — A Comparative Study of the Thorax in Orth- 

 optera, Euplexoptera, and Coleoptera. Proc. Ent. Soc. 

 Wash., 9, p. 95 — (Terga and wing bases of Dermaptera and 

 Coleoptera figTired). 



1909. Snodgrass — The Thorax of Insects and the Articulation of 

 the Wings. Proc. U. S. Nat. Museum, 36, p. 511— (Terga 

 and wing bases of Plecoptera, Dermaptera, and Coleoptera 

 figured) . 



Abbreviations. 



(The subscripts 2 and 3 denote mesothoracic and metathoracic 

 structures respectively.) 

 a. . .Adanal process (adanale) sometimes a detached plate, but 



usually serving as a pivot for wing in movements of flight. 

 abd. First abdominal tergum. 



ac . . Alacrista, or alar ridges for holding elytra in place when at rest, 

 d . . . Myodiscus, or muscle disc, 

 m . . An alar ossicle, the medipterale. 

 np . . An alar ossicle, the notopterale. 



p . . . Chitinous area possibly homologous with the parategula. 

 pa. .Prealare, or prealar sclerite. 

 psc .Prescutum. 

 psl. . Postscutellum. 



pt . .Postplica, or posterior fold of tergal region, 

 ptg . Parategula ? 

 s . . . Spiracle. 



sa . . An alar ossicle, the basanale. 

 ss . . Scutal suture, 

 su . . Suralar process (suralare) serving as a pivot for movements of 



flight, 

 t . . . Region homologous with tegula ? 

 tg . . Tegula. 

 tr . .Transcutal suture. 



