NO. 6 GRASSHOPPER ABDOMEN SNODGRASS 87 



Prcx, precoxal pleural sclerite. sr, sternal ridge. 



PvS, perivisceral sinus. Stn, primitive sternum. 

 Py, pylorus. 



T, tergum. 



Rect, rectum. id, dorsal transverse muscles. 



Tm, tympanum. 



S, definitive sternum. tr, tergal ridge. 



sa, external pit of sternal apophysis. tz% ventral transverse muscles. 

 SCls, sense cells. 



Sco, scolops (sense rod). J'eut, ventriculus. 



SI, sternellum. I'H, lateral internal ventral muscles. 



SO, sense organ. rim. median internal ventral muscles. 



Sp, spiracle. I 'i valvula. 



Sphr, spermatophore. vl, ventral lobe of aedeagus. 



spn, external pit of sternal spina. Vlf, valvifer. 



Spr, spermathecal aperture. VNC, ventral nerve cord. 



sps, spermatophore sac of endophallus. VS, ventral sinus. 

 Spt, spermatheca. 



SpfD. spermathecal duct. IVP, pleural wing process. 



REFERENCES 

 Ander, K. 



1934. t)ber die Gattung Cylindracheta und ihre systematische Stellung. 

 Archiv Zool. K. Svenska Vetenskapsakad., vol. 26 A, no. 21, 16 pp., 

 13 pis. 

 Blatchley, W. S. 



1920. Orthoptera of Northeastern America. Indianapolis. 

 BOLDYREV, B. T. 



1929. Spermatophore fertilization in the migratory locust (Locusta migra- 

 toria L.). Reports on Applied Entomology (Russian), vol. 4, pp. 

 189-218, 18 figs. 

 Brues, C. T., and Melander, A. L. 



1932. Classification of insects. Bull. Mus. Comp. Zool.. vol. 73, 669 pp., 

 1 121 figs. 

 Cholodo\v.skv, N. 



1 910. t)ber die Spermatophoren, besonders bei den Insekten. Trav. Soc. 

 Imp. Naturl. St. P'ctersbourg, vol. 41, pp. 128, 129. 

 Chopard. L. 



1920. Recherches sur la conformation et le developpement des derniers 

 segments abdominaux chez les Orthopteres. Rennes. 

 Fedorov, S. M. 



1927. Studies in the copulation and oviposition of Anacridium aegyptium 

 L. Trans. Ent. Soc. London, vol. 75, pp. 53-6i. pls. 5-8. 

 Ford, Norma 



1923. A comparative study of the abdominal musculature of orthopteroid 

 insects. Trans. Roy. Canadian Inst., vol. 14, pp. 207-319, pis. 7-23. 



GlARDINA, A. 



1901. Funzionamento deU'arniatura genitale femminile e considerazioni in- 

 torno alle ooteche degli Acridii. Giorn. Sci. Nat. Econ. Palermo, 

 vol. 23, pp. 54-61. 8 figs. 



