48 LEPIDOPTERA. 



just before the apex. By the intersection of the branches of the 

 two main veins, a short middle cell is formed, included by the 

 two main veins, and their converging branches to the spot where 

 the latter meet. The anterior branch of the sub-costal vein 

 runs in a straight direction to about the middle of the costa ; 

 the posterior branch of the sub-dorsal vein first runs obliquely 

 towards the inner margin, curves beyond the middle of the 

 wing towards the apex, and terminates quite close to the 

 branch of the sub-costal vein, which runs to the inner margin 

 or even unites with it. The dorsal vein runs obliquely 

 towards the inner margin, is then curved forwards, and 

 beyond is parallel to the inner margin; beyond the middle 

 of the wing it approaches the posterior branch of the sub- 

 dorsal vein, and often runs into it quite in the same way as 

 the latter runs into the posterior branch of the sub-dorsal 

 vein. 



According to my observations this form occurs in Aiigu- 

 hjerella, Agrimonice^ Argentipedellaf Argyropeza^ Tur- 

 hulella, Suhhimaculella and Simplicella. The venation 

 differs in Tityrella and JVeaveri thus,— the posterior branch 

 of the sub-dorsal vein is wanting, and this, therefore, runs 

 quite simple from the base to the costa, intersecting the pos- 

 tei'ior branch of the sub-costal vein soon after the forking of 

 the latter ; and hence the dorsal vein remains separate and 

 further removed from the branches of the two main veins, 

 and terminates in or near the inner margin at about three- 

 fourths of the length of the wing. In the other species 

 which I have examined, viz., Tilice, Anomalella, Regiellay 

 Gratiosella, Splendidisshnellay Plagicolella, BetuUcola, 

 Blalella and Septenihrella, the sub-dorsal vein is entirely 

 wanting. It is true it occurs in liujicapitellaf Salicis and 

 3fi/rtilli, but is very fine and short, and it terminates before it 

 reaches the posterior branch of the sub-costal vein ; hence in 



