THE 



f ra^tkal ©ttt^m^togfei 



A MONTHLY BULLETIN, 



Published by the Entomological Society of Philadelphia, for the dissemination of valuable 

 knowledge among Agriculturists and Horticulturists. 



Vol. II, No. 3. 



DECEMBER, 1866. 



Whole No. 15. 



®k practical (Kntomobgijjt. 



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PHILADELPHIA, DECEMBER, 1856. 



THE OLD-FASHIONED POTATO BUGS. 



As the New or Colorado Potato Bug has been 

 repeatedly confounded throughout the country with 

 the different Potato Bugs, that have for time imme- 

 morial infested the Potato throughout the United 

 States, I propose in this article to give a short ac- 

 count, illustrated by figures, of these last. The 

 farmer can then see at a glance what kind of an 

 enemy he has got to fight ; and every soldier knows, 

 that to be well acquainted with the physique and 

 morale of your enemy is a battle half gained. 



The annexed figure represents the Three-lined 

 Leaf-Beetle {Lema trilineata) considerably mag- 

 nified, the hair-line showing its natural length. 

 One character by which this insect 

 may be easily distinguished from the 

 common Cucumber-beetle (Diabrotica 

 vittatd)* which it otherwise strongly ^ 

 resembles at first sight, is the remark- 

 able pinching in of the sides of the ' 

 thorax, so as to make quite a lady-like Colors, cream- 

 waist there, or what naturalists call a '=°''"' * '''*'=''• 

 "constriction." It is also, on the average, a some- 

 what larger insect, and difl'ers in other less obvious 

 respects. 



The larva of this insect may be distinguished 

 from all other larvae, that feed on potato leaves, by 

 its habit of covering itself with its own dung; in 

 which respect it agrees with the Tortoise-beetles 

 (^Cassida) — for example, the Gold-bug (^Cassida 

 2>aUida') which feeds on the Morning Glory and 

 also on the Sweet Potato, and the two-striped Tor- 

 toise-beetle ( C. hivittata') which likewise feeds on the 

 Sweet Potato in southern latitudes. There is an- 



*Figured in the Practical Entomologist, I, p. 110. fig. 2. 



