262 
Psyche 
[September 
Description of responses represented in figures d, e, f, g. 
Fig. d. Kicking with hind (jumping) legs , in an abdomen up- 
right posture. This has been observed less frequently than any other 
response shown on Plate 2 1 ; the wasp might or might not be kicked 
away at various distances from the cricket. Probability of subsequent 
attack is low and this is in sharp contrast with same response occurring 
in full hunting phase (see PL 22, fig. i). Intense grooming or other 
non-hunting activities are frequently performed by the “kicked wasp”. 
No graded series comparable to the one represented on figures 
a, b, c, has been recorded for response shown on figure d, the occur- 
rence of which is rather unpredictable. Therefore its position on the 
scale of intensities is more arbitrary and difficult to evaluate. Other 
intensity dependent parameters of the hunting phase have been used, 
especially the vigor of the attempts of the wasp to investigate the 
cricket. Apparent level of recruitment of responses of the cricket 
and relative violence of them appear to be intermediate between 
responses represented on figures a, b, c, which are less violent, and 
escape responses shown on figures f, g, which are more complete. 
Fig. e, f. Jumping away; Fig. g. Running away ( escape re- 
actions). These probably represent more complete mobilization of 
the cricket and are characteristically associated with more vigorous 
and sustained attacks of the wasps involving sudden “pouncing”. 
They have therefore been placed at the top of the intensity scale. 
Roeder gives a very precise analysis of “evasive reactions” in cock- 
roaches. 
Probability of subsequent pursuit is, however, still relatively low, 
which is in contrast with full hunting phase. Vigor of the attacks 
does not appear to be consistently different for running response 
versus jumping response, although suddenness of attack might favor 
the latter slightly. 
Interactions and responses typical of full hunting phase 
(represented on Plate 22). 
These almost invariably involve displacement and escape of the 
cricket (except response shown on fig. i). They are consistently 
associated with vigorous, sustained attacks and attempts at catching 
the crickets. Wasps seem to have reached an optimal level of re- 
sponsiveness to crickets and intensity of hunting reactions. Therefore 
these responses lack, in general, any predictable “gradation”. Inter- 
actions are represented on Plate 22 in function of possible orders of 
succession, indicated by broad arrows. Kinds of responses and orders 
of succession are often unpredictable. Solid lines with arrows indi- 
