43 



wards; between the teeth there begins a deep groove extending 

 obliquely upwards to the anal opening; the chitinous borders 

 (e) of this groove are dentate. The second ring is also chitinous; 

 the basal part (b) is broad, concave below; the piece terminates 

 in a narrower thin part, forked at the end with the rounded tips 

 turned downwards; these two black lobes may be seen without 

 removing the anal tufts; on the under side of the basal part 

 there is a deep groove (g) beginning just above the anus. 



By means of this apparatus the eggs are placed for the winter. 

 They are arranged one after another, varying in number from a 

 few to a hundred or more, in a tube formed by rolling over the 

 margin of a withered dry leaf of the food plant. It appears 

 that as the eggs are extruded and placed a little way back from 

 the- margin (about one-third the width), the same is then folded 

 over the eggs and firmly cemented down, thus forming and fill- 

 ing the tube. The eggs thus covered with the leaf and cement 

 appear to pass the winter under the snow, and more or less 

 under water, unharmed. 



I have not been so fortunate as to see the moth in the act of 

 oviposition, although a number were kept for many days with 

 Typha in an aquarium. I found, from time to time, many of the 

 eggs, but visits paid by day or by night failed to discover the 

 manner of the work. 



The eggs are white, obscurely ribbed, short, cylindrical; the 

 length equals .5 mm., and the width .875 mm. The shells are not 

 very firm, so they are sometimes deformed by the pressure of the 

 tightly drawn cover. 



Since the larva of this moth bores the same plant as N. typhce 

 of Europe, it seems appropriate to compare the two species. 

 The moths agree closely in size; typha; is slightly larger ( .J 40 mm. 

 2 48 mm., Guenee); the ground color differs and the veins are 

 not marked with white as in typhce; the discal dots are not so 

 plain on under side of hind wings, and much more distinct in 

 fore wings; the secondaries are concolorous, while in typhce they 

 are lighter than the primaries, with the outer third darker; the 

 first and second joints of the palpi of the latter are more heavily 



