THE CANADIAN ENTOMOLOGIST, 25 



australisella was by some mistake not published, and believing it to be the 

 same with dctermiiiatella ZelL, I determined not to publish it.) 



CE. constridella Zell. 



The size and ornamentation of this species, as described and figured 

 by Prof. Zeller, are so nearly identical with those of Thcisoa bifasciella 

 Cham., that I was at first convinced it was the same species, and can 

 now, after the most careful examination, only doubt whether they are the 

 same. T. bifasciella was described by me in the Can. Ent. for 1874, and 

 consequently, if they are the same, constridella is the specific name by 

 priority. But if they are the same, the reference of the species to CEco- 

 phora is certainly very wide of the mark. It is true the characters of the 

 head and appendages of bifasciella might do for those of an (Ecophora ; 

 and it was owing to these characters and the position of the insect in 

 repose that I separated it under the generic name Theisoa from Elachista, 

 to which it is, in my judgment, much more nearly allied than to (Ecophora. 

 The insect in repose sits, or rather stands, with the body elevated above 

 the surface on which it stands, with the wings horizontal and a little 

 separated or spread, and the head a little lower than the apex of the 

 wings. But the wings are too narrow and cilice too long for Qicophora ; 

 and the neuration is widely different. The neuration and form of the 

 hind wings is exactly that of Elachista obsciirella (Ins. Brit., v. j), except 

 that the subcostal vein is distinct throughout its entire course; and the 

 fore wings only differ from it by having the median subdivided into two 

 instead of three branches ; but one of these branches is furcate ; and the 

 second branch of the apical vein (the one going to the dorsal margin) is 

 absent in bifasciella. The cell is unclosed in the hind wings, and the 

 submedian vein of the fore wings is not furcate at the base. The neuration 

 is still nearer to that of Elachista p?'cematHrella Clem. Surely such an 

 insect as this can not with propriety be placed with (Ecophora I Prof. 

 Zeller says : " Fascia ante medium cinnamonea, exterins albido-7narginata" 

 &c., while I describe it loc. cit. as " basal third of primaries pale saffron 

 slightly suffused with fuscous," and " at the basal third of the primaries a 

 silver white fascia dark margined internally," &c. A reference to Prof. 

 Zellers figure shows that both descriptions mean the same thing. He 

 defines the color perhaps more correctly than I do. The color gradually 

 increases in density from the base backwards, and just before the fascia 

 suddenly becomes a little darker and ends in a narrow row of brown 



