THE TRACHEATION OF WINGS 



33 



for only a short distance. It would seem that the tracheae to the wings are 

 almost at the point of being separated from those of the legs, in this form. 



The longitudinal trachea {d. It) is well developed yet it does not seem to 

 be in any wa}- connected with the wing tracheas. 



The basal connections of the wing trachecB of Antheraa roylei, Order Lepidop- 

 tera. — Three pupse of the Lepidoptera were dissected, Aclias luna, Samia 

 cecropcea, and Anthercea roylei. Any of the three might have been used 

 equally well for the conditions of the tracheae are the same in all of them. 

 In the micsothorax (Fig. 21) there seems to have been no modification from 

 the typical condition, but in the metathorax the cubito-anal trachea (cu-a) 



Fig. 21. — The basal connections of the wing trachese of Anthercea. Side view. 



and the posterior stem of the leg trachea {ps) are just separate from each 

 other at their bases. 



The dorsal longitudinal trachea id. It) is present but has no connection 

 with the wing tracheae. The metathoracic spiracle is absent but is repre- 

 sented by the trunk of the rudimentary spiracle (r. sp-i) with which the 

 tracheae have retained their typical relationships. 



The thoracic tracheas of Anthercea perni have been described and figured 

 by Enderlein {Zoologische Jahrhucher, 1902; vi.). 



This author figures trachese to the mesothoracic leg as a single stem 

 arising from the spiracular trunk of the mesothorax and the leg trachea of 

 the metathorax as also single and arising from the costo-radial trachea of 

 the mesothorax. The conditions of the tracheae seem to be so constant in 

 representatives of this order which have been studied that it would seem 

 very improbable that there should be such a great difference between two 

 members of the same genus as Enderlein's figure would indicate. 



