they terminate abruptly. Legs pale yellow. Interior surface of 

 abdomen also pale yellow. 



LarvirTB of this fly kept in confinement, pupated during the first 

 part of August, and the flies emerged between the fifteenth and 

 twenty-fifth of September. During this period the larva; were ob- 

 served among the lice in the fields, a fact which indicates several 

 broods during the summer. The only flies obtained were accident- 

 ally destroyed, and their species can not therefore be definitely de- 

 termined. The larvse creep like leeches, and when they have seized 

 a plant louse, raise the anterior part of their bodies so as to pre- 

 vent the struggles of the prey freeing it from their grasp. A Euro- 

 pean species is said to devour as many as one hundred plant lice 

 in an hour. I have watched our species on several occasions, 

 and even when hungry they did not finish one louse in less than 

 five minutes, and three or four lice at one time seemed to satisfy 

 them. Generally but one or two larvae occur in a colony of lice. 



The Smaller Two- Spotted Lady Bug {Hyperasjyis signata, Oliv.) — 

 This lady bug has a reputation as a destroyer of the destructive 

 bark louse of the maple trees. It occasionally occurs also among 

 the herds of corn plant lice in the corn fields. 



The Plain Lady Bug {Cydoneda sanguinea, Linn.) — The adult of 

 this lady bug is also found among colonies of lice. It is less com- 

 mon as a rule than the following species, but in some fields in the 

 south part of the State which we visited, it was the more abundant 

 of the two. 



The Spotted Lady Bug (Megllla maculata, DeG.) — This lady bug is 

 common in all its stages upon corn and destroys great numbers of 

 lice. In the autumn and winter great numbers of the adults, some- 

 times thousands in a heap, may be found under boards at the edges 

 of the corn fields. 



Two other lady bugs, Hlppodamia glaclaUs and Coccinella 9-notata 

 have been observed in the fields but neither occur in sufficient 

 numbers to be of any great service. 



The Lace-winged Fly {Chrysopa sp.)— The larvae of one or more 

 species of these flies are frequently seen devouring the aphides, and 

 occasionally are locally abundant in the fields. 



Artificial Eemedibs. 



Of artificial remedies but little can be said. The corn fields are 

 so large that an application of any of the insecticides which can be 

 used successfully for smaller crops would be impracticable. The 

 parasites and predaceous insects may be depended upon to prevent 

 any general increase in the numbers, and where local outbreaks 

 occur, more than one season's serious damage can probably be 

 avoided by burning off old fields in the fall as soon as the corn is 

 busked, and to some extent also by planting on ground which has 

 not been in corn. For garden corn the use of a solution of kerosene 

 emulsion thrown upon the corn from a garden engine carried on a 

 cart would be sufficient to destroy the lice. 



