3O4 C. II. TURNER. 



victim is dragged partly or wholly beneath the soil, and the 

 juices imbibed through the hollow mandibles. Later the dried 

 carcass is tossed away. 



6. The ant-lion may be considered positively geotactic, posi- 

 tively thigmo tactic and negatively photo tactic; with the res- 

 ervation that all of its movements cannot be explained as 

 tropisms in the Loebian sense. 



7. It is impossible for the ant-lion to move forward; but, in its 

 backward movements, it can move in straight lines or curves, 

 and can scale vertical surfaces that are not too smooth. The 

 hind legs assist in producing this backward movement, and the 

 other legs brace the body. 



8. Sometimes it avoids water and at others it backs into it. 



9. If the spherical cocoon of this insect is near the surface of 

 the ground, the chrysalis comes only part of the way out and the 

 imago emerges from its back. If the cocoon is at a slightly 

 greater depth, the chrysalis comes entirely out of the cocoon and 

 part of the way out of the ground. If the cocoon is at a greater 

 depth, the chrysalis emerges entirely from the cocoon and 

 perishes on the way to the surface of the ground. 



10. Rough handling or dropping from a slight elevation will 

 usually cause an ant-lion to letisimulate. The length of a feint 

 and the position of the longest feint in a series of successive feints 

 varies in different individuals and in the same individual at 

 different times. 



1 1 . There is no obvious relation between the temperature, the 

 strength of the stimulus, or fasting and the duration of a letisimu- 

 lation. 



12. If the relative durations of the successive feints of a long 

 series of letisimulations are plotted, the curve will have two or 

 more crests. 



13. In the ant-lion all letisimulation poses are not death at- 

 titudes. The ant-lion has no characteristic death-feigning 

 posture. It is to be grouped with those insects in which the 

 letisumation pose varies with the attitude of the individual 

 at the time when the stimulating shock is received. 



14. Although pinching a leg and, sometimes, even blowing on 

 the body, will usually cause a letisimulating ant-lion to come out 



