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 tentiform mi?ies . 
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 - 
della (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 ha t?i a dryadella: a, mine; b y young larva; Cy full-grown, flat-form 
larva; d , head of same, enlarged; e, antenna of same, enlarged; y, round-form larva 
from above; same from below; h, head of same, enlarged; antenna of same, en¬ 
larged; k y maxilla and palpus of same, enlarged; /, labium, labial palpi, and spinnerets 
of same; w, pupa; n, side view of pupal crest; o t 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 badly that there were on an average four or five mines in 
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. 
