348 Annals Entomological Society of America [Vol. VI, 



the branches representing medius one, medius two and medius 

 three plus four. The hind wing is characterized by the great 

 development of cubitus, and the fact that in certain cases, 

 Amphiscepa (Fig. 16), radius and medius coalesce for a con- 

 siderable distance from the base of the wing. 



Sub-family Achilida. 

 The fore wings in this sub-family are characterized by the 

 fact that subcosta and radius are coalesced for a considerable 

 distance from the base, and the fact that there are usually 

 several cross veins between subcosta and the costal border 

 of the wing". Radius and medius offer no special characters 

 and cubitus is typically two branched, although there are 

 frequently accessory cross veins between cubitus two and the 

 anal border of the wing. 



Sub-family Dictyopharida. 



The chief characteristics of this sub-family are to be found 

 in the complete or all but complete coalescence of silbcosta and 

 radius. In Scolops (Fig. 29), they are completely coalesced. 

 In Dictyophara (Fig. 31), nearly completely coalesced, but in 

 Phylloscelis (Fig. 22), are not coalesced except for a short dis- 

 tance at the base. Medius is typically two branched, but 

 in Scolops (Fig. 29), there are several accessory branches. 

 In Scolops (Fig. 29), and Dictyophara (Fig. 31), cubitus is 

 typically two branched, but in Phylloscelis (Fig. 22), cubitus 

 bears several accessory branches. 



Sub-family Issida. 

 I have studied only a few genera in this sub-family. In 

 Thionia (Fig. 35), all of the branches of the principal veins 

 are reduced, medius alone being typically two branched. 

 All of the veins are connected by a number of cross veins. 

 In Bruchomorpha (Fig. 33), a study of the adult wing alone 

 seems to indicate a condition closely approximating the con- 

 dition found in the Delphacida, in which radius and medius 

 are coalesced for a considerable distance, radius diverging 

 strongly and coalescing with medius throughout the middle of 

 its course, and then diverging strongly toward the costal border 

 of the wing. In all of the Issida that I have examined second 

 and third anal are coalesced for nearly half of their course at 



