250 



THE STUDY OF INSECTS. 



mines. In some of the blotch mines the epidermis of one 

 side of the leaf is thrown into a fold by the growth of the 

 leaf ; these are tcntiform mines. 



In addition to peculiarities in shape many mines are 

 marked by characteristic lines or spots composed of the 

 droppings of the larva. 



The following species will serve to illustrate the habits 

 of these remarkable insects. 



The White-blotch Oak-leaf Miner, Lithocolletis hamadrya- 

 dclla (Lith-o-col-le'tis ha-mad-ry-a-del'la). This little miner 

 infests the leaves of many different species of oak, and some- 





FIG. 298. Lithocolletis hamadryadella: a, mine; , young larva; c, full-grown, flat-form 

 larva; </, head of same, enlarged; e, antenna of same, enlarged; /, round-form larva 

 from above; g, same from below; h, head of same, enlarged; /, antenna of same, en- 

 larged; A, maxilla and palpus of same, enlarged; /, labium, labial palpi, and spinnerets 

 of same; ;, pupa; , side view of pupal crest; a, front view of same; y, cocoon; Q, 

 moth. (From the Author's Report for 1879.) 



times it is extremely abundant. We have seen trees infested 

 so badlv that there were on an average four or five mines in 



' O 



each leaf. Figure 298 represents a leaf from such a tree. The 

 mine is a whitish, blotch mine in the upper side of the leaf. 



