BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 243 
1736. Riley, C. V. — Continued. 
Introductory. 1 
Text of circular sent out by the commission, 1—History of the in¬ 
vestigation, 1—Need thereof, 2—Early work of To wnend Glover, 
Thomas Affleck, and D. L. Phares, 2—Special report ordered by 
Congress, 3—Character of the Bulletin, 3—Division of the cot- 
tou-belt in the southern or hibernating and the northern or 
non-hibernating portions, 4—Practical aim of the commission, 
4—Persons who have assisted, 4. 
1. Destructiveness of the worm . 7 
Losses occasioned by it...*. 7 
Increase of injury westward, 7—Least injury in northern portion 
of belt, 7—Tabular statement of loss for past 15 years, 8. 
2. Popular and scientific names for the insect.*_ 8 
Most desirable popular name, 8—Different technical names by 
which the insect has been known, 8—Earliest description of 
it, 8. 
3. Characters and stages of the insect. 9 
The egg. 9 
The worm always hatched from an egg, 9—Where the egg is laid, 
9— Number of eggs to a leaf, 10—All eggs perish during winter, 
10— Other eggs mistaken for those of Aletia, 10. 
The worm or larva. 10 
Character of newly-hatched worm, 10—Number of molts, 11— 
Variation in color, 11—Peculiar habits, 11—Flourishes on the 
cotton-plant only, 12. 
The chrysalis... 12 
Duration of chrysalis state, 13—It never transforms below ground, 
13—How it mhy be distinguished from other species, 13. 
The moth or imago. 13 
Distinguishing characters of the moths, 14—Sexual differences, 
14—Different habits at night and at day, 14—Fecundity, 15— 
It finds its natural food on the cotton-plant, 15—Fond of 
fruits, 15—Character of its tongue, 15. 
4. Time elapsing from one generation to another . 16 
It varies greatly, but averages about one month, 16. 
5. Time of year when the first worms appear . 16 
Prevailing opinions erroneous, 16—The worms hatch in April, 
16—First worms always in small numbers, 17—The third gen¬ 
eration usually called the first, 17. 
6. Condition of soil and plant connected with the appearance 
OF THE FIRST WORMS . 18 
The worms appear first on low, moist, and rich lands, 18—Few 
exceptions to the rule, 18—The plant must be well advanced 
and luxuriant, 18—Some shelter generally near, 19—Reoccur¬ 
rence year after year in the same spots, 19—Theory explaining 
first appearance under the circumstances observed, 19. 
7. Wet weather favors the development of the worms . 20 
Humid and hot atmosphere most favorable, 20—Heavy storms 
destroy, 20—Effect of dryness, 21—Indirect influences of wet 
weather, 21—It prevents the working of the worm’s natural 
enemies, 21. 
