BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 
1570. Riley, C. V.—Continued. 
The gooseberry span-worm —Continued. 
sect single-brooded, 5—How it spreads, 5—A native species, 5— 
Its past history, 5—It prefers the gooseberry to the currant, 6— 
The moth is closely imitated by one which greatly differs struct¬ 
urally, 6—Parasites, 6—Remedies, 7—Other currant span- 
worms, 7. 
The imported currant-worm, Nematus ribesii . 
Belongs to the “ false-caterpillars,” 7—The different specific names 
it has received, 7—An imported species, 8—Its introduction and 
spread, 8—Independently imported at several eastern points, 9— 
Its natural history, 9—How the eggs are laid, 10—Nature and 
habits of the worm, 11—Characters of the parent flies, 12—Pre¬ 
ventive measures, 13—Remedies, 13—White hellebore the best, 
13—How best used, 14-15—The worm is not poisonous, 16—Nat¬ 
ural enemies, 17—It furnishes a forcible example of arrenotoky, 
or the power of producing male offspring without impregnation, 
18—Results of parthenogenesis in different insects, 18—It also 
furnishes an interesting instance of defunctionation of special 
parts, 19—The saw of the female imperfect compared with others, 
20—Evolutionary bearings of this fact, 21—Descriptive, 21— 
Variation in the antenure and wing veins, 22. 
The native currant-worm, Pristiphora grossularioe . 
Wherein it differs from the imported species, 23—Its habits, 24— 
Where the eggs are laid, 25—How the winter is passed, 25—Its 
occurrence in Missouri, 26—Remedies, 26—Descriptive, 26. 
The strawberry-worm, Harpiphorus maculatus .-.. 
Also a false-caterpillar, 27—It has a wide range, 27—How the eggs 
are deposited, 28—Character 'and habits of the worm, 28—Reme¬ 
dies, 28—Descriptive, 28. 
Abbot’s white pine-worm, Lopliyrus abbotii . 
Destructive power of the insects of its genus in Germany, 29— 
Evergreens which it prefers, 30—Habits and characters of the 
worm, 30—Variation in the anteume, 30—Characters of the per¬ 
fect flies, 30-31—How the eggs are laid, 31—Natural enemies, 
31—Remedies, 32—Descriptive, 32. 
Le Conte’s pine-worm, Lophyrus lecontei . 
A more general feeder than Abbot’s species, 32—The close resem¬ 
blance of the worms, 33—How they differ, 33—Descriptive, 33— 
Other species of the genus, 34. 
The Colorado potato-beetle, Doryphora 10 -lineata . 
Injury in the West in 1876, 34—Spread of the insect during the 
year, 34-35—Its great abundance on tbe Atlantic coast, 35—Rate 
at which it traveled since 1859, 37—An average of 88 miles a 
year, 37—How it traveled, 37; principally in the beetle state, 
and greatly assisted by man, 37—Its migrating habit, 38— 
Area invaded by it nearly 1,500,000 square miles, 38—Causes 
which limit its spread, 38—Will it reach the Pacific slope?, 39— 
How it affected the price of potatoes, 39—The modification it has 
undergone, 40—A mite parasite added to its natural enemies, 
41—Its introduction to Europe, 42—A living specimen found last 
summer in the Bremen dock-yards, 42—Could it live and multi¬ 
ply in Europe?, 43—Action taken by European governments to 
prevent its introduction, 44—Consideration of the Kearney ‘‘po- 
tatoqjest poison,” 45. 
13 ENT- 14 
