BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 209 



1570. EILEY, 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, Nematm ribesii 7 



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 iu the antennae and wing veins, 22. 



THE NATIVE CURRANT-WORM, Pristiphora grossularife 23 



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 27 



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, Lophyrus ablotil 29 



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 antennae, 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 32 



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 W-lineata 34 



Injury in the West iu 1876, 34 Spread of the insect during the 

 year, 34-35 Its great abundance on the 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- 

 tato-pest poison," 45. 



13 ENT 14 



