THE TRUMPK'I' LEAF-MINER OF THE APPLE. 



25 



are greenish yellow in color and soniewhal Iraiii^luceiil. In some 

 lights they are irriclescent, as are the empty egg shells. One or two 

 days previous to hatching they become comparatively conspicuous, 

 the embryo being central and the whitish margin shoAving plainly 

 against the dark color of the leaf. The empty shells are white and 

 mark the beginning of the mine. The average size (based on meas- 

 urements of five eggs) is 0.34 nun. hy 0.54 nnn. The eggs are at- 

 tached closely to the leaf, usually in furrows along a veinlet, but 

 occur more or less nromiscuously. This stage has not ])reviously been 

 described. 



The larva. — The larva (fig. 9, c) upon liatcnmg measures about 

 0.7 mm. in length. The head is brownish, the rest of the body whit- 

 ish, except cervical and anal shields, which are dusky. Full-grown 

 larva" will average 5 mm. in length by 1 mm. in width across che 

 third thoracic segment. The head is about 0.5 mm. wide, retractile, 

 bilobed. brownish or even black in color. The general color of the 

 body is light green, ex- 

 cept cervical and anal 

 shields, which are 

 brownish. The body is 

 fiat, with the segments 

 very distinct, and taper- 

 ing caudad from the sec- 

 ond or third segment, 

 the hist three segments 

 I'ounder and nai'rower 

 than the preceding. 

 Thoracic segments with 

 three long seta' on each side; succeeding segments with two seta^ on 

 each side varying considerably in length; at caudal end there are 

 numerous shorter curved seta*. Thoracic legs absent. Abdominal 

 and anal legs marked by five pairs of crochets (see fig. 9, c, d). 



Tlit' pupa.—^\\e pupa is rather variable in size, the average of five 

 being 3.35 nun. by 0.95 nun. The color when first formed is rather 

 uniforndy pea green, later becoming much darker, varying witli age. 

 The general color of the thoracic region and head is dark brown to 

 blackish. The abdomen is dark green, yellowish caudad: the caudal 

 niai-gin of tlic rather distin.ct segments is brown. Leg and wing 

 sheaths free: lip of tliird pair of legs reaching to cephalic border of 

 third segment from last. Tlie antennal sheatlis i-each the ceplialic 

 margin of the fifth segment from last. The spiracles are on slight 

 conical elevations, and on each side of abdomen, ventrad of spiracles, 

 is a row of long slender seta>. a pair to each segment. Cremaster of 

 two stout short projections, slightly curved at tip. Head obtusely 



9.— Trumpet k-af-miner of the iiprle y Tisriir 

 Uella): Adult, larva, pupa, details. 



'nlifo- 



