INSECTS INJURIOUS TO THE PINE. . 197 
space on the back between the spots on segments 5, 6, 7,and 8, is much wider than 
between the others. This is probably asexual difference, since those thus marked 
are shorter, thicker, and of a yellower white than those reg’ularly marked. After 
each change of skin the head is at first white like the rest of the body, with the usual 
eye-spots black. No markings while young. 
67, THE FIR SAW-FLY. 
Lophyrus abietis Harris. 
Defoliating the leaves of the fir, spruce, as well as the pitch-pine, larvie similar to 
the foregoing, the flies-appearing late in July and also early in May. (Harris.) 
The following account of the tir saw-fly is taken from Harris’s Treatise: 
“Hor some years past many of the fir trees, cultivated for ornament, in 
this vicinity, have been attacked by swarms of false-caterpillars, and, 
in some instances that have fallen under my notice, have been nearly 
stripped of their leaves every summer, and in consequence thereof have 
been checked in their growth, and now seem to be in a sickly condition. 
My specimens of this kind of saw-fly, which were raised from the cater- 
pillars in the summer of 1858, came out of their cocoons towards the 
end of July in the same year; but I have also found them on pines and 
firs early in May.” 
To this account Dr. Fitch makes the following comments: 
‘7 suspect Dr. Harris’s observations upon this species were not full, 
and that like the analogous saw-fly which we have noticed on the pine, 
No. 273, there are two generations of this species annually; for we are 
informed that the perfect insect appears in May, producing a crop of 
worms in June and July, from the cocoons of which the perfect insect 
come out the last of the latter month. But Dr. Harris supposes that 
most of these cocoons remain unhatched through all the hot weather of 
August and September and the winter succeeding, to give out the flies 
which appear in May. It is much more probable, however, that the 
flies all come out of their cocoons about the beginning of August, and 
like the species we have seen on,the pines, produce another brood of 
worms in autumn, which has escaped the notice of Dr. Harris; and it 
is these which lie in their cocoons through the winter and give out the 
flies which are met with in May.” . 
The male saw-fly is smaller than the female, with broadly pectinated antenne, and 
istinch in length; body black above and brown beneath, legs dirty leather-yellow 
color. 
The female is about three-tenths of an inch long; body yellowish brown above, 
with a short blackish stripe on each side of the middie of the thorax; body beneath 
and legs paler, of a dirty leather-yellow color: antenne short, tapering to a point 
consisting of 19 joints, and toothed on one side like a saw. (Harris.) 
68. Le CONTE’S SAW-FLY. 
Lophyrus Lecontei Fitch. 
Clusters of dirty yellowish, black-spotted false caterpillars onthe outer branches of 
ornamental pines and firs on lawus, stripping the leaves and disfiguring the shrubs. 
Dr. Fitch described under the above name this saw-fly, but did not 
rear it from the larva, though inferring that it was the parent of certain 
