226 THE CANADIAN ENTOMOLOGIST. 



the larva obtains the materials it uses. Apparently it drops just about 

 enough into the packet for the object in view, for it is certain that the 

 grains are usually expelled wherever the larva happens to be, and fall to 

 the ground. After the end of the perch is sufficiently strengthened and 

 there is no further need of the grains, the packet is dropped behind and 

 neglected. 



The larvse of Arthemis hatch in from seven to nine days, undergo two 

 moults, and construct, each for itself, cases or hybernacula of leaves in 

 which to pass the winter. As the weather in spring becomes settled and 

 warm, they emerge from their cases, feed a few days sparingly, and pass 

 the third moult, soon to be followed by the fourth and last, and must 

 change to chrysalids from ist to 15th June. 



The larvae of Disippus. however, mostly pass three moults before they 

 make their cases (at Coalburgh, W. Va., though perhaps but two towards 

 the northern limit of the species), and two moults in the spring. But 

 occasionally a larva is found constructing its case and taking possession 

 after the second moult. Whether these individuals pass more than two 

 moults in the spring, I am not yet able to say. Both species cut out the 

 patterns of the cases as follows : First eating a narrow canal for one 

 quarter inch, the width of the head, obliquely outward from the stem at 

 base ; next a canal of same length on the side of the leaf, about three 

 fifths the distance to the apex, perpendicular to the edge ; then turning 

 this at a right angle in the direction of the first canal and cutting for a 

 little distance ; then crossing to the other half of the leaf and cutting 

 similar canals ; after which the extremity of the leaf was cut off by an 

 incision from the bend in the second canal directed obliquely forward to 

 the midrib, first on one side, then on the other ; next the first and second 

 canals on one side were joined, then on the other side, and there remained 

 of the leaf but a small fiddle-shaped piece, lying almost equally on either 

 side the rib. Before and during the time this work was progressing, the 

 larva had taken intervals of rest from the cutting, and had occupied itself 

 in weaving threads from the branch to the stem, and along the upper side 

 of the leaf, thus coating with silk what was to be the inside of the case. 

 Finally, beginning at the base, it drew the edges partly together for a little 

 distance, leaving an open space between of about one tenth inch, and 

 held them in position by single threads ; then proceeded to weave a thick 

 permanent covering to this gap ; which dune, it worked back, drawing the 

 edges as before, and weaving, till at length the case was complete. As it 



