236 L eaf-Min er . 



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 larvae 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 pupae 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 Tineidcc. It seems also that there 

 is usually but one brood annually, and perhaps the pupae remains 

 in the earth until the following spring. 



Below is given a description of the larva: 



Fvill-grown larva of leaf-miuer ou Popvlus fremonti: Elongate, creamy 

 whitish, with six pale brownish true legs. Twelve segments beside the head, 

 legs 5- jointed, terminal joint small, conical. Head j)ale 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 sviture 

 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 jiair of jiro-legs, ai^pear- 

 ing as very small buds on ventral surface defined anteriorlj^ by a pale brown- 

 ish usually semihinar marking. Anal tubercle brown or blackish, except 

 terminal and dorsal surfaces which are whitish. Head fiilly 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 siDecimens) 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. 



