122 



[ June, 



The transverse nervule in the area I'adi- 

 alis not much further removed from 

 the end of radius than the nervule in 

 the area subcostalis. 



The outer nervule in the area discoidalis 

 is placed on the upper branch of the 

 first cubital fork on the base of the 

 second fork, or a little removed from it. 



The nervule limiting outwardly the cel- 

 lula postcubitalis intermedia lies a 

 little behind the inner nervule in the 

 area discoidalis (according to Low's 

 figure!). 



The fork of the sector radii in posterior 

 wings very short, a little shorter than 

 its distance from the anastomosis of 

 the transverse nervule in the area ra- 

 dialis (according to Low's figm-e!). 



The transverse nervules in the area sub- 

 costalis and radialis meet each other 

 almost at the same point. 



The outer nervule in the area discoidalis 

 runs into the sector radii very little 

 before the nervule in the area radialis, 

 and with its other end into the upper 

 branch of the second fork of the 

 cubitus. All the four nervules in the 

 outer series form therefore a line. 



The nervule limiting outwardly the cel- 

 lula postcubitalis intermedia forms 

 almost a line with the inner nervule 

 in the area discoidalis. 



The fork of the sector radii in posterior 

 wings long, more than two-thirds of 

 the length of its stalk, so that the 

 transverse nervule in the area radialis 

 runs into the first third of its upper 

 branch. The same nervule meets the 

 radius very little before the nervule 

 in the area subcostalis. 



Though the differences seem slight, they are very constant and 

 thorough. I supposed at first that Dr. Low had known the types of 

 "Wallengren, and considered perhaps his own examples as a variety 

 not deserving further mention ; but Mr. Wallengren was kind enough 

 to inform me that his types are in the Museum at Stockholm, and have 

 not even been seen by himself for 20 years. As Dr. Low does not 

 mention he had before him materials of this Museum, I must infer he 

 did not know the types, and was guided by the description only. I 

 am now convinced of the distinctness of Aleuropteryx {Coniopteryx) 

 lutea, Wallg., and the Aleuropteryx described by Low, which may, in. 

 honour of its worthy discoverer, bear the name of Lowii. Our Bohe- 

 mian specimens belong to the true A. lutea, Wallg. (the neuration of 

 which is represented in the figure here given), and were collected on 

 Ahies picea. The Aleur. Lowii lives on Pinus mugJius, Scop. 



Whether the specimens from Finland and Siberia belong to the 

 true Aleuropteryx lutea or not remains to be decided. 



Prague, Bohemia : 



April 29th^ 1894. 



