CATALOGUE OF INSECTS. 537 



Aiits are the most intelligent among insects, and their habits are complicated, 

 forming a most interesting study. 



Where they infest houses they should be attracted to sponges dipped in sugar- 

 water and laid near where they run : when a sponge becomes filled with the 

 insects it should be thrown into boiling water and replaced by another. This 

 sort of warfare kept up for a few days so demoralizes the ants that owing to the 

 inexplicable disappearance of so many of their comrades they leave the house. 

 Fresh bones serve as well as sponges, and should be burnt as soon as they 

 become covered. 



When ants infest lawns they can be cleaned out by pouring bisulphide of 

 carbon into the main entrance or entrances. The heavy fumes follow the gal- 

 leries and kill larvae as well as adults : one application usually serving to destroy 

 the hill. Where a hill is large, with many openings, three or four holes can be 

 punched into it with a stick and the bisulphide poured into them — an ounce or 

 two in each. Then close the holes by stepping on them, or in any other way. 



Our collections are extremely incomplete. 



Family XLIV PONBRIDiE. 



There is only one segment in the peduncle between thorax and abdomen, the 

 space between the third and fourth segments is constricted, and the females are 

 furnished with a sting. The species are mostly rare. 



STIGMATOMMA Roger. 

 S. pallipes Hald. Gloucester, Westville, under bark, rare (Fox). 



SYSPHINCTA Roger. 

 S. pergandei Em. Pennsylvania (Ashm). 



PONERA Latr. 



P. coarctata Latr. Philadelphia, IV, 20, Camden and Gloucester Co. 



(Fox). 

 P. gilva Roger. Should occur in New Jersey. 

 P. pennsylvanica Buck. Pennsylvania (Ashm). 



DISCOTHYREA Roger. 

 D. testacea Roger. Should occur in New Jersey. 



PROCERATIUM Roger. 

 P. silaceum Rog. Pennsylvania (Ashm). 



