82 The American Naturalist. [January, 
appear chiefly in July and later, emerging, however, as early as June, 
and belated individuals as late as October. June and July are there- 
fore the worst months for the moths over the principal peach districts. 
The egg is deposited on the bark, usually at or near the surface of the 
ground, although rarely it may be placed well up on the trunk or in 
the crotches of the larger branches. The egg is very minute, not ex- 
ceeding 0.2 mm. in length, oval, yellowish-brown in color, and irreg- 
ularly ornamented with hexagonal sculpturing. The young larva on 
hatching is very active, and immediately burrows into the bark, usually 
entering at cracks, Having worked its way to the sapwood, usually 
near or below the surface of the ground, it feeds steadily through the 
balance of the summer and well into the fall, constantly enlarging its 
excavation, and causing the exudation of the gum intermixed with ex- 
erement and fragments of bark, which is so characteristic of its pres- 
ence. It remains dormant in the larval state du ring winter and resumes 
feeding again the following spring, reaching full growth in the central 
districts by the middle of June. It transforms to chrysalis within an 
elongate, cocoon-like cell constructed of its own frass and particles of 
bark attached with gum and threads of silk. The moths emerge very 
shortly after the chrysalis state is assumed, usually only a few days 
intervening. The males appear a few days earlier than the females.— 
C. L. MARLATT, Cireular No. 17, Dept. of Agriculture. 
Smith’s Economic Entomology.—Professor J. B. Smith has 
written and the Lippincott Company has published a valuable and read- 
able book of nearly 500 pages with abundant illustrations. Its full 
title “ Economie Entomology for the Farmer and Fruit-grower and for 
Use as a Text-book in Agricultural Schools and Colleges” indicates its 
scope and purpose. Itis divided into three parts the first devoted to 
the structure and classification of insects; the second to the classifica- 
tion and life-histories of insects, and the third to insecticides, prevent- 
ives and machinery. Hight chapters are devoted to the first part, nine 
to the second and five to the third. The book is an admirable resumé 
of the present status of economic entomology, and will prove especially 
helpful in those agricultural colleges where the course in entomology . 
is too short for the use of Comstock’s excellent manual.—C. M. W. 
Oceanic Migration ofa Dragon -fly.—Robert McLachlan‘ records 
the taking of many specimens of the Dragon-fly Pantala flavescens F. 
on the P. and O. Steamer “ Victoria” in the ocean 290 miles from ` 
* Ent. Monthly Magazine, VII, 254. 
