PROC. ENT. SOC. WASH., VOL. 23, NO. 1, JAN., 1921 



13 



Ge, gen a. 



Gl, salivary glands. 



h, tip of bar from second seta attaching to occipital margin of head. 



Hphy, hypopharynx. 



Lb, labium. 



Ib, base of detached labium. 



Lm, labrum. 



mb, neck membrane. 



Me/, muscle of salivary pump. 



Md, mandible. 



md, site of detached mandible. 



Mth, mouth. 



mth, external aperture of functional mouth channel. 



MX, maxilla. 



mx, stump of removed maxilla. 



o, ocelli. 



(E, oesophagus. 



IPAp, protractor apodeme of first seta. 



Pge, postgena. 



Phy, pharynx. 



phv, supplementary pharynx, or bulb-like anterior end of oesophagus. 



IPMcl, protractor muscle of first seta. 



2PMcl, protractor muscle of second seta. 



/A'.//), retractor apodeme of first seta. 



IRMcl, retractor muscles of first seta. 



2RMcl, retractor muscles of second seta. 



S\, sternum of prothorax. 



Sa/D, salivary duct. 



SalPmp, salivary pump. 



TI, tergum of prothorax. 



Ten, tentorium. 



ten, origin of anterior arm of tentorium. 



.v, point on Locustid head corresponding with location of setal pouches 

 of the cicada. 



BIBLIOGRAPHY. 



BORNER, CARI. (1904). Zur Systematic der Hexapoden. Zool. An?.. XXVII, 



1904, pp. 511-533, 4 figs. 

 BUGNION, E. and POPOFF, N. (1911). Les pieces buccales des Hemipteres. 



Arch. d. Zool. Exp. et Gen. 5c SSrie, VII, 1911, pp. 643-674, pis. XXV 



XXVII. 

 HEYMONS, RICHARD (1899). Beitrage zur Morphologic und Entwicklungs- 



geschichte der Rhynchoten. Nova Acta. Abth. d. Kaiserl. Leop.- 



Carol. Deutsch. Akad. d. Naturf., LXXIV, No. 3, 1899, pp. 351-44f>, 



pis. XV-XVII. 

 MECZNIKOV, ELIAS (1866). Embryologische Studien an Insekten. Zeit. f. 



wiss. Zool. XVI, pt. 4, 1866, pp. 437-478, pis. XXVIII XXXII. 



