SUPERFAMILY TINEOIDEA 95 



The mines are more or less trumpet shaped, as the common 

 name implies, though the blotch portion is often oval or 

 irregular, and the basal half is often marked with transverse 

 crescents of white (due to intervening depositions of dark 

 colored frass), making them easily recognizable (see pi. 2, 

 figs. 2 and 3). They occur on the upper surface, involving 

 the palisade layer of leaf parenchyma. Generally they do 

 not cross the larger veins. 



The best description of the immature stages is that of 

 Quaintance (1907), from which we quote as follows: 



The egg. The eggs of Tischeria malifoliella are regularly ellip- 

 tical in outline, somewhat convex centrally, but flattened around 

 the margin, which area is more or less wrinkled. When first laid 

 they are greenish yellow in color and somewhat translucent. In 

 some lights they are irridescent, 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 

 showing plainly against the dark color of the leaf. The empty 

 shells are white and mark the beginning of the mine. The eggs 

 are attached closely to the leaf, usually in furrows along a veinlet, 

 but occur more or less promiscuously. 



The larva. The larva upon hatching measures about 0.7 mm. 

 in length. The head is brownish, the rest of the body whitish, 

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

 larvae will average 5 mm. in length by 1 mm. in width across the 

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

 tractile, bilobed, brownish or even black in color. The general 

 color of the body is light green, except cervical and anal shields, 

 which are brownish. The body is flat, with the segments very 

 distinct, and tapering caudad from the second or third segment, 

 the last three segments rounder and narrower then the preceding. 

 Thoracic segments with three long setae on each side; succeeding 

 segments with two setae on each side varying considerably in 

 length; at caudal end there are numerous shorter curved setae. 

 Thoracic legs absent. Abdominal and anal legs marked by five 

 pairs of crochets. 



