346 Annals Entomological Society of America [Vol. VI,, 



except at the tip where subcosta diverges and the vein which 

 forms along this tip in the adult resembles a branch of the radial 

 vein. This condition is especially apparent in Stobcera (Fig. 

 46), Myyidus (Fig. 48), Dictyophara (Fig. 26) and Amphiscepa 

 (Fig. 6). In Scolops (Fig. 24), subcosta appears merely as 

 a weak trachea lying parallel with radius along its base. 



The Radius of the Hind Wing. 

 In nearly all cases radius of the hind wing is a single un- 

 branched trachea. In certain genera, however, such as Scolops 

 (Fig. 24), Dictyophara (Fig. 26) and Acanalonia (Fig. 2), radius 

 shows more or less tendency to branch near the tip. These 

 branches are rather variable as an examination of different 

 individuals of the same species clearly shows. Therefore I 

 have made no attempt to homologize these branches. 



The Medius of the Hind Wing. 

 A typical medius of the hind wing of Fulgoridae is two 

 branched, but frequently these branches show a decided 

 tendency to branch again before reaching the tip of the wing 

 pad. In Stobcera (Fig. 46) and Thionia (Fig. 28) medius is a 

 simple unbranched trachea which in Stobcera runs parallel with 

 cubitus for a considerable distance, the veins of the adult 

 coalescing at this point. 



The Cubitus of the Hind Wing. 

 In many genera cubitus of the hind wing occupies the 

 greatest area and bears somewhat the same relationship to the 

 other tracheae of the hind wing that medius bears to the other 

 tracheae of the fore wing. In Myndus (Fig. 48) and Phylloscelis 

 (Fig. 8), cubitus is unbranched. In Stobcera (Fig. 46), Thionia 

 (Fig. 28) and Scolops (Fig. 24) cubitus is typical. In the other 

 genera studied cubitus has two principal branches, each of 

 which bears one or more accessor}^ branches. 



The Anals of the Hind Wing. 

 The first anal of the hind wing bears the same relation 

 to cubitus that it does in the fore wing. The second anal 

 trachea is usually simple and unbranched, and lies parallel 

 with the first anal. The third anal trachea has been found 

 in all of the genera studied and is usually branched. Although 

 in some cases Thionia, Dictyophara and Scolops the third 

 anal trachea is three branched. 



