THE NEPTICULIDES. 179 



Heinemann showed that there was a third or intermediate form, and 

 that one of the forms noticed by Herrich-Schaffer could easily be derived 

 from the other. He says : "In the more complicated form, the sub- 

 costal and sub-dorsal nervures are present ; both are forked between one- 

 tbird and one-fourth of the length of the wing and the anterior branch 

 of the sub-dorsal nervure, and the posterior branch of the sub-costal 

 nervure, as it turns first towards the inner margin and then towards the 

 costa, runs into the last-named after first emitting a branch to the inner 

 margin, and then parallel to this a branch to the apex, or to the 

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

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

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

 the latter meet. The anterior branch of the sub-costal nervure runs 

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

 branch of the sub-dorsal nervure 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 nervure, 

 which runs to the inner margin, or even unites with it. The dorsal 

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

 latter runs into the posterior branch of the sub-dorsal nervure. This 

 form of neuration has been observed in N. angulifasciella, N. agrimoniae, 

 N. argentipedella, N. arggropeza, N. turbidella, N. subbimaadella and 

 N. simplicella. 



" In N. tityrella (bamlella) and N. weaveri, the neuration differs, in that 

 the posterior branch of the sub-dorsal nervure is wanting, and this, there- 

 fore, runs quite simple from the base to the costa, intersecting the 

 posterior branch of the sub-costal nervure soon after the forking of 

 the latter, and hence the dorsal nervure remains separate and further 

 removed from the branches of the two main nervures, and terminates 

 in or near the inner margin at about three-fourths of the length of 

 the wing. In N. tiliae, N. anomalella, N. regiella, N. gratiosella, N. 

 xplendidissimella , N. plagicolella, N. betulicola, N. malella and N. sep- 

 tembrella, the sub-dorsal nervure is entirely wanting. The latter is 

 very fine and short in N. ruficapltella, N. salicis and N. myrtillella, and 

 terminates before it reaches the posterior branch of the sub-costal 

 nervure, so that in these species the cell is wanting. 



" Sometimes the sub-costal nervure forks again soon after the first 

 furcation, emitting a second branch to the costa, which corresponds 

 with the anterior branch of the sub-dorsal nervure in the more com- 

 plicated form, from the place where it intersects the posterior branch 

 of the sub-costal nervure and then proceeds to the costa. In other 

 words, in the more simple form the sub-dorsal nervure and its pos- 

 terior branch is entirely wanting, and the anterior branch is want- 

 ing from the point of intersection of the two intersecting branches 

 of the two nervures. Lastly, in the more simple form there is 

 also wanting one of the last three branches of the sub-costal 

 nervure which terminate near the apex of the wing ; the latter is 

 consequently represented as a nervure, which runs first parallel to 

 the costa, then turns sharply towards the inner margin, and at the 

 same time sends two parallel branches to the costa, and lastly is 



