THE CANADIAN ENTOMOLOGIST. 223 



i. A, splendor if erella, Clem. Loc. tit. 



Lyonetia Saccate/la, Packard, Guide, p. 355, and plate 8, Jigs. 18, a a?id b. 



Dr. Clemens found this " perfect little gem," as Dr. Packard truly 

 calls it, mining the leaves of Haw trees (Crataegus) in August, and cutting 

 out its cases, preparatory to pupating, in the latter pari of August and in 

 September. He also found a similar larva mining the leaves of the Wild 

 Cherry tree (Primus serotina) at the same time, but was uncertain as to 

 the species. I have bred it from the mines, and find it to be this species. 

 I have also bred it from the leaves of the Sweet Scented Crab (Pyrus 

 coronaria), and from those of the Apple. At linden Grove Cemetery, at 

 this place, it occurs by the million. In that Cemetery (so called because 

 there are only two or three Linden saplings in it, I suppose), there are a 

 great many Wild Cherry trees, and in August, scarcely a leaf can be seen 

 without a mine, and, usually, from two to five or six in each ; and in 

 September, after they begin to descend, to pass under one of the trees is 

 like sticking one's head into a cobweb. A little later, the trees and fences 

 are plastered over with their little cases. 



Dr. Packard's account of his Lyonetia saccaiella is brief, as it must of 

 necessity be, in such a work as the " Guide," but I think there can be no 

 doubt that it is identical with this species, which was first described by 

 Dr. Clemens in the "Proceedings" loc. tit. I am led to this conclusion by 

 the following facts : — 



The species of Lyonetia are not case bearers, but leave their mines to 

 pupate on a nidus on the ground. The antennae in Lyonetia are about as 

 long as the wings, while Dr. Packard's figure represents them, as they are 

 in this species, about one half as long as the wings. The description of 

 the species by Dr. Packard is so accurate for this species (considering its 

 brevity), that it is not probable that two species belonging to different 

 genera, should resemble each other so closely ; and he found, at the same 

 time, upon the same food-plant, and with the extraordinary "mimicry" 

 carried so far, that one of the species, belonging to a genus in which 

 there are no other case bearers, assumes the case bearing habit in imitation 

 of the other. Such a case of mimicry would delight Messrs. Wallace & 

 Bates beyond measure. 



Dr. Packard evidently supposed that his species was a case bearer 

 throughout its larval existence. But the fact which he states, that the 

 case is made of the cuticle of leaves, shews that it has once been a miner. 

 He found it on the leaves of the Apple, in the latter part of August and in 



