APPENDIX 



EXPLANATION OF SYMBOLS USED IN THE 

 ANATOMICAL ILLUSTRATIONS 



Since nearly all of the illustrations of anatomical parts are 

 from the work of Snodgrass it may be best to give the list 

 of symbols and alphabetical lettering prepared by him and 

 given on pp. 141-147 of his paper. These will aid in iden- 

 tifying parts which are labeled in the illustrations, used in 

 this book to illustrate certain portions only. 



1. SYMBOLS 



• 

 A, anal vein; lA, first anal, SA, second anal, etc. 



AcGl, accessory gland of male reproductive organs. 



AGl, acid gland of sting, opening into poison sac {PsnSc). 



AGID, duct of acid gland of sting. 



An, anus. 



ANP, anterior wing process of notum. 



ANR, anterior marginal ridge of notum. 



Ant, antenna. 



AntL, antennal lobe of brain. 



AntNv, antennal nerve. 

 Ao, aorta. 



Ap, apodeme, any internal chitinous process of body-waU. 



Aph, anterior phragma of any tergum, prephragma. 



Ax, ' the axiUaries or articular sclerites of the wing base, 



designated individually as lAx, 2Ax, SAx, and 4Ax. 

 ax, accessory axillary sclerites of irregular occurrence in 



connection with the principal axiUaries {Ax). 

 AxC, axillary cord, or hgament-like thickening of posterior 



edge of basal membrane of wing, attached to posterior 



angle of scutellum. 

 AxM, axillary membrane, the thin membrane of wing base, 



containing the axillary sclerites and forming in some 



cases the lobes called alulae. 

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