THE THORAX AISID ITS APPENDAGES. 



C 



Sc, 



61 



Fig 26 — Basal elements of winus of Hymenoptera : A, base of front wing of a sawHy 

 {'itucomia (lisnilur) showiim comparatively wnerali/.ed arransx-ment of veins and 

 axillaries; B, bases of anterior "veins of front wing of a horntail (,Sirea: ftavtcorms), 

 showing detachment of liase of snlicostai vein (.Sc) from its shaft; C, corresponding 

 view of anterior veins in front wing of a tarantnla killer [Prnsis sp.), showing com- 

 plete absence of shaft of subcosta, but presence of basal part (.S'c) fused with base of 

 radius (li) ; D, axillaries of anterior wing of honey bee worker; K. legula of worker; 

 F Ijase of anterior wing of worker showing absence of shaft of subcosta but presence 

 of scale (.s'c) derived from its base; (i. axillaries of Hind wing of worker, the fourth ab- 

 sent in bee • IT base of bind wing of worker, showing absence of costal and subcostal veins 

 and fusion of bases of subcosta iSr) and radius {/{) into large humeral mass; I attach- 

 ment of front wing to scutum (,S'i/0 and scutelliiin iSch) of mesotergum :-J, under view 

 of end of mesoscutellum {Sfl<) showing attachment of both first (/.la-) and fourth 

 axillaries (M-r) to posterior wing process (PiV/'), an unusual connection for first axillary. 



