THE CANADIAN ENTOMOLOGIST. 39 



could always be obtained by using a sweeping-net among the common 

 fern. At the same time could be obtained in abundance upon the ferns 

 greenish larvae which I have no doubt were those of that species. These 

 larvae when full grown are about two-thirds of an inch long. The body is 

 finely transversely wrinkled ; bright green above and whitish below. The 

 head has a brow^i patch on vertex and behind the eyes, which is reduced 

 in some specimens to two dots on vertex and one behind each eye. By 

 the middle of June the species were numerous, including Tcnthredo ver- 

 ticalis, T. rufopccUiSi M. flavicoxce^Pacilostoma albosectus, this rare insect 

 being taken on 13th; and Tenthredo {?) delta, of which seven ^ were 

 taken on i6th. Hickories suffered considerably during the latter part of 

 the month from the larvae which I think to be those of Acordtdecera dor- 

 salis. They are one-third of an inch long. The body is whitish, with 

 green dorsal stripe, is slightly pubescent and has the lateral margins 

 dilated. The head is black and the thoracic feet are whitish. The ab- 

 dominal feet are very minute. On the 24th I found several colonies of 

 Ncmatus Erichsonii on larches not far from the line of the Canada 

 Atlantic Ry., along which route the fly appears to have reached Ottawa. 

 These I destroyed, with the exception of one brood, which I took home 

 and which commenced to spin their cocoons on 2nd July. Two or three 

 days later I found a few other broods of small larvae, and twigs bearing 

 eggs which were also destroyed. On subsequent visits I found no further 

 traces, and hope that I have checked the increase of the species in that 

 locality for another year. On the 27 th June I found cedars at Hull 

 greatly infested with the larvae of an undetermined saw-fly. I have mis- 

 laid a description of these larvae and have only the following brief note 

 of four specimens taken the previous August : " Yellowish green, with 

 darker undefined dorsal and lateral stripes ; black thoracic feet, eight pair 

 abdominal feet, head ferrugineous, length 15 m." It seems to be the 

 species mentioned by Packard on page 257 " Insects Injurious to Forest 

 and Shade Trees," as Lophyrus abietis, but the larvae differ somewhat in 

 color from those of that species taken upon spruce. I have always found 

 the larvae of Lophyrus abietis captured on spruce comparatively easy to 

 rear, but with those from the cedar I was unsuccessful. When placed in 

 the breeding-jar, they left their food and clustered upon the side, and 

 would only feed when the jar was wrapped up or placed in the dark, and 

 they gradually died before spinning their cocoons. The larvae of iV. 

 siim/aris, the locust saw-fly, were common during the summer. An imago 



