236 , Leaf-Miner. 
edge of the blistered portion from which the parenchyma has been 
eaten, and next the latter. ' 
A remedy for these miners is rather hard to suggest. Perhaps an 
arsenical spray about the time the leaf-buds begin to swell would 
kill the newly-hatched larvee when they begin to enter the leaves. 
Birds and chickens seem to destroy many of them after they 
have left the leaves and descended to the ground. On May 4, 
what were supposed to be pupz were found in the earth under a 
cottonwood tree, and blackbirds were reported digging them out 
and eating them. : 
It is quite certain that this miner is lepidopterous, and it will prob- 
ably be found to belong to the 7zmeide. It seems also that there 
is usually but one brood annually, and perhaps the pup remains 
in the earth until the following spring. ° 
Below is given a description of the larva: 
Full-grown larva of leaf-miner on Populus fremonti: Elongate, creamy 
whitish, with six pale brownish true legs. Twelve segments beside the head, 
legs 5-jointed, terminal joint small, conical. Head pale tawny brownish or 
testaceous, with a median posterior ventral brownish marking; mouth parts 
darker distally. First segment (next head) with a large oblong brownish 
marking situated in the middle, which covers about one-half of the dorsum 
of segment and is divided in the middle longitudinally by a faint median 
whitish line or suture, and also transversely through the middle by a suture 
which, however, does not show as a whitish line. A median pair of brown 
dots on dorsum of second segment. Venter of first segment with a large 
brown marking in middle, venter of second and third segments with a much 
smaller brown spot, and venter of fourth with a still smaller brown dot. 
Fifth to eleventh segments each with rudiments of a pair of pro-legs, appear- 
ing as very small buds on ventral surface defined anteriorly by a pale brown- 
ish usually semilunar marking. Anal tubercle brown or blackish, except 
terminal and dorsal surfaces which are whitish. Head fully three-fourths 
width of first (next) segment; second and third segments widest and also 
shorter than the other segments which are all of a nearly uniform length, ex- 
cept sometimes the fourth which is not quite so long. Segments four to 
_ twelve often exhibit (in alcoholic specimens) a continuous longitudinal me- 
dian furrow on the dorsal surface. 
In some specimens the dorsal markings of the first and second segments 
have disappeared, or are absent, and the legs have nearly lost their pale 
brownish color. 
Length, about 9 mm.; width of second and third segments, 2 mm.; average 
width of following segments, 1.5 mm. ; 
Described from alcoholic specimens. 
