70 [NoVKAIIiKK 



ness, (retaining likewise the mined leaf and numbering it,) and the particu- 

 lars of its transformation to a pupa, numbering the description and the 

 vessel containing the leaf-miner. Two insects that are distinct, or sus- 

 pected to be distinct species, should never be placed in the same breeding 

 vessel. For the great majority of leaf-miners, a common tumbler or drink- 

 ing glass, the top of which is made level by grinding with emery on a 

 piece of sheet lead, covered with a piece of glass, and containing a little 

 white sand moistened with water, makes a very good breeding vessel. 



The leaf, or if a large one a portion of it, is stuck into the moistened 

 sand and this together with the humid air of the interior of the vessel 

 keeps it fresh. 



(Joleophora larvfB do not bear well confinement in humid air of the breed- 

 ing jar. To be successful in rearing the larvae, one must use a pot of moist- 

 ened sand, in which the food plant is placed, covered with a glass cylinder, 

 with fine gauze tied over the top; or the plant may be kept in water and 

 covered with a cylinder of glass. For this purpose old chimney tops to 

 lamps, answer very well. The larvae of this genus, taken in the fall of 

 the year hybernate in their cases until the following spring and " feed up" 

 on the first leaves that put forth. They must not, therefore, be kept in a 

 warmed room during the winter. The pupae of the fall brood of larvae 

 thrive much better, likewise, if not kept in a warmed room during the 

 cold months. The spring or early summer brood of larvae produce imagos 

 in a few weeks after entering the pupa state and hence it is much more 

 satisfactory to collect early in the year than during the latter part. 



F(»r convenience of reference, I append a table of months, designating 

 the species included in this paper and their food plants, and intended to 

 show when they should be looked for by the collector. 



I shall be glad to hear from any one who may find any of the larva and 

 is successful in rearing the imago. At the same time he might communi- 

 cate the fact to the Entomological Society for publication in their proceed- 

 ings, accompanied with a description of the imago and any observations 

 on its natural history he may deem interesting or important. In the course 

 of time, such a system would make the Journal an entomological necessity 

 and provide a pleasant and instructive channel of communication between 

 American entomologists. 



A CALENDAR SHOWING WHEN THE FOLLOWING LARV^ SHOULD 



BE SOUGHT. 



MAY. 



Coli'ophoni TillfrfDliclhi . Early to end. Leaves of Basswood, T. Anipr 



