Dec. ao, 1915 
Cherry and Hawthorn Sawfly Leaf Miner 
523 
The technical description of each of the larval stages follows: 
First instar. —Body translucent, white, shining; only slightly wrinkled, and with 
a green streak, due to alimentary tract, showing plainly in the abdominal segments. 
Prolegs appear as only slight elevations. 
Head is slightly brownish, being of dark color on the outer and posterior edges; 
mouth parts are reddish brown. The ventral side of the first thoracic segment has 
a pair of brownish gray marks, shaped roughly like a T, with the cross bar running 
longitudinally and the perpendicular reaching outward to a point just in front of 
the leg. A semicircular line of the same color occurs in front of the anus and is inter¬ 
rupted on the median line. 
Newly hatched larvae are about 1.2 mm. in length, and after feeding, the body 
grows, reaching a length of 2.3 mm. Width of head, 0.36 to 0.42 mm.; average, 0.39 
mm. 
Second instar. —All markings of body are more extensive than in preceding stage. 
Dorsal side with some specimens has a broad, faint, brownish gray, transverse band 
on the first thoracic and two spots on the second thoracic segment. The pair of marks 
on ventral side of first thoracic segment are shaped more like inverted V’s, and between 
them there is a large longitudinal band. The second and third segments have median 
oval spots. Bach proleg is marked by a narrow crescent on the anterior side. A 
semicircular mark on the last segment extends over half a circle and is not interrupted 
on the median line. 
Length, 2.6 to 3 mm. Width of head, 0.48 to 0.55 mm.; average, 0.52 mm. 
Third instar. —All markings are the same as in preceding stage, but are much 
fainter. Prolegs are more prominent; those on the first and penultimate abdominal 
segments are small. 
Length, 3.2 to 4.3 mm. Width of head, 0.63 to 0.73 mm.; average, 0.67 mm. 
Fourth instar. —The characteristic markings in preceding stages practically dis¬ 
appear in this instar. A ring of several rows of minute papillae surrounds the anus. 
These probably exist in the earlier instars and escape detection because of their 
small size. 
Length, 4.5 to 7.2 mm. Width of head, 0.8 to 0.9 mm.; average, 0.85 mm. 
Firth instar. —This is similar to fourth instar. There are no distinct color markings. 
Length, 6.5 to 7.5 mm. Width of head, 0.92 to 1.07 mm.; average, 1 mm. 
Sixth instar. —The body does not differ from that of preceding stage. The head 
assumes a vertical position. The four sutures on the dorsal side are very faint. The 
clypeus and labrum are shorter than in fifth instar. The mandibles protrude promi¬ 
nently and do not meet at the ends. The labium and maxillae project from beneath 
the head to beyond the tips of the mandibles. 
Length is same as in fifth instar or may be a trifle shorter. Width of head, 0.90 to 
1.05 mm.; average, 1 mm. 
PUPA 
Until color of adult begins to show, the pupa is white in all portions except the 
eyes, which are reddish. Length about 5 mm. 
adult 
“Body [of female] black, with the clypeus, labrum, malar space, the mandibles, 
the first segment of the antennae, the tegulae, a narrow margin to the pronotum, and 
the legs, for the most part, whitish. The prothorax, except the parts named, the 
cephalic part of the mesopleurae, and the pectus, rufous; the posterior femora more 
or less shaded with fuscous; the head smooth with antennal furrows interrupted on 
the middle of the face; the furrows surrounding the postocellar area deep and dis¬ 
tinct, the vertical furrows not reaching the occiput; the median ocellus placed on a 
flat depression; a pit above the antennal socket; the median fovea minute but dis- 
