1905 ENTOMOLOGICAL SOCIETY. 57 



Tiie larvaB of the Leopard moth are borers. The species has found its 

 way to New York. 



In Canada a very common and mischievous pest is the Forest-tree tent 

 caterpillar (Clisiocampa disstria). This also flourishes more abundantly some 

 years than others. In 1899 it and its congener, ClisiocaTupa Americana, were 

 so abundant in the Counties of Drummond and Shefford that they stripped 

 the second growth trees bare. Hordes of them crossing the railway brought 

 the train to a standstill, the rails having become slippery with crushed larvse. 



The larva of C. disstria (the Forest tent caterpillar) can readily be a^'s- 

 tinguished from that of C. Americana (the Orchard Tent caterpillar). It has 

 a blue head, and a row of silvery spots down the back (Fig. 18), while the 

 other has a black head and a continuous dorsal line (Fig. 19). I consider C. 

 disstria the worst of the leaf-eating foes of our hardwood trees. 



The larvae of Orgyia antiqua and Orgyia leucostigma are handsome but 

 mischievous. They are beautifully tufted .along the back. (Fig. 4.) Those 

 of the latter species may be known by their red heads. Both kinds feed upon 

 a variety of forest trees. 



The males of these species are called "Vapourers" because of" their- jaunty 

 flight. They skip hither and thither, as Wood says, "like Ccelebs in search of 

 a wife." The females, on the other hand, are most exemplary in their be- 

 haviour. St. Paul, if he had been an entomologist, would have admired them 

 greatly — they "go not from house to house," they stay at home and mind 

 their own affairs. They remain upon the cocoons, from which they crept. There 

 they await their mates; there they lay their eggs; and there they die. But 

 we must not give them too much credit for their domestic virtues. They are 

 aided by the force of circumstances in conducting themselves well — they have 

 only rudimentary wings. (Fig. 7.) 



There are a number of large moths, the larvae of which under peculiar 

 circumstances might become injurious to forest trees. Their very size makes 

 them formidable. (Fig. 20.) The larvae of the Hawk-moths, Sphinx chersis 

 and Sphinx kalmice, feed upon the ash, though I frequently find them on the 

 lilac. This is not surprising, for both the lilac and the ash belong to the same 

 family of plants, the Oleaceae, of which the olive tree is the type. 



The larva of Ellema coniferarum feeds upon the pine. I wish the species 

 were a little more common, for I have only met with one specimen in many 

 years. 



The larvae of Ceratojnia amyntor feed upon the elm. They have four 

 prominent horns on their shoulders; and Harris on this account gave them the 

 name of Quadricomis. There are peculiarities in the form and habits of this 

 species that are well worth notice. 



It will be remembered that the leaves of the elm on the under side are 

 strongly and regularly ribbed, and that they are often curled over on one side 

 in a roll. The Amyntor caterpillars are of the same color as the leaf, and 

 along the sides have seven oblique, raised, rough lines. They lie extended 

 along the edge of the leaf, and in. that position very closely resemble the roll 

 of the leaves near them. Nor is this all. In the autumn the leaves of the 

 elm become rusty brown in colour, and that the resemblance to the leaves may 

 be maintained, the caterpillars become of the same hue. They afford in this 

 a rmarkable instance of what is called Mimetic Analogy. 



The ^arva of that stately mo+h, Triptogon modesta, feeds upon the pop- 

 lar, and that of Cressonia juglandis upon the black walnut, the butternut and 

 the hirkory. 



Upon a variety of forest trees, the larvae of those magnificent Saturn- 

 ians, Attacus cecropia (the largest of our moths), and Telea polyphemus are 



