150 THE CANADIAN ENTOMOLOGIST. 



Alar ex, 2 lines or less. I have made some other observations on it 

 in its various stages, vol. 3, ante p. 223. As there stated, it mines the- 

 leaves not only of the Apple, in which Dr. Clemens found it, but also 

 those of the Haw ( Cratcegiis)^ Pear (Fyrus), Wild Cherry (Primus 

 seroti?ia), and since then I have found it mining the leaves of the Quince 

 (Cydonia). All of these trees (except, perhaps, the Wild Cherry) are so 

 nearly related that it is not surprising to find in the leaves of any one of" 

 them any larva which mines the leaves of another, and the Wild Cherry 

 is such a favorite food with the larvae of Lepidoptera, that it is not 

 surprising to find any larva feeding on it which is not exclusively attached 

 to some single species. Thus an Or?nx, which mines Apple leaves, also 

 mines those of the Wild Cherry. Tischeria vialifoliella Clem., and 

 Lithocolletis cratcEgdla also both mine the leaves of all the above named- 

 trees except, perhaps, the Pear and the Quince. The fact that A. 

 splendoriferclla mines the leaves of the trees named, affords no presumption 

 then that it is a general feeder, or that it mines the leaves of any tree 

 not closely allied to the Haw. 



I make these suggestions because Mr, Stainton, in the preface to his 

 very valuable addition of the writings of Dr. Clemens (for publishing 

 which he has the hearty thanks of every student of the American Micros),, 

 states that he has bred from Aspen leaves, from Oregon, a species which 

 it would be very hard to distinguish from A. splendoriferella. But because 

 of the difterence in the food plants, Mr. Stainton (rightly, I think) 

 considers it a different species. If the vignette upon the title page of 

 Mr. Stainton's edition, above named, is, as I suppose, intended to 

 represent the mined Aspen leaf, I think it establishes the specific character 

 of the Aspen species. The hole left in the Aspen (judging from the 

 vignette) is very nearly an ellipse. That made by A. splendoriferella is 

 much wider in proportion to its length, being nearly as wide as long, and 

 the case is almost angulated at the sides. The mines of the Micro- 

 Lepidoptera, and the larval cases of the case-bearing species, and the 

 modes of pupation, and forms and colors of their cocoons and pupa cases, 

 have specific characters as distinct as the galls made by the Cynipidcc. 

 The color of a pupa case, cut from a leaf, depends, for instance, not only 

 on that of the leaf, but of the silk with which it is lined and the color of 

 the enclosed larva and pupa. But I have never been able to detect a 

 difference between the pupa cases of A. splendoriferella from any of the 

 leaves mined by it, as above stated. See remarks under the next, 

 species. 



