128 THE WINGS OF ORTHOPTERA 



The costal trachea. — The data regarding the costal trachea in the salta- 

 torial Orthoptera is as inconclusive as is that regarding the costal trachea in 

 the Blattidas. In none of the Orthoptera that we exainined was a distinct 

 separate costal trachea found. Frequently, as in the acridid nymph (Fig. 

 i2i) and in that of Conocephaliis (Fig. 122), there is a prominent branch of 

 the subcostal trachea of the fore wing that simulates a costal trachea ; but a 

 study of a series of forms led us to believe that this is merely an overgrown 



Fig. 121. — Wings of an acridid nymph (After C. & N.). 



branch of the subcostal trachea; in the hind wing of Conocephalus (Fig. 

 122) there are two such branches. 



Handlirsch ('06-08) copies this figure of the tracheation of the wings 

 of Conocephalus and labels this prominent branch of the subcostal trachea 

 in the fore wing as the costal trachea ; and he labels the corresponding vein 

 in an adult wing the costa. This is probably the basis for his conclusion 

 that in the saltatorial Orthoptera the costa is remote from the margin of 

 the wing. 



The subcostal trachea. — In the forms studied the subcostal trachea was 

 well-developed and in some of them extended nearly to the tip of the wing 

 (Fig. 121 and 122). In some cases it gives off many branches towards the 

 margin of the wing (Fig. 122); in others it is nearly or quite simple (Fig. 

 123), but in no case is there a division into two branches that clearly corre- 

 spond to the Sci and Sc2 of the hypothetical primitive wing. 



