IO2 P. W. WHITING AND ANNA R. WHITING. 



them hastily as over any other object such as cloth, cotton, 

 paper, etc. Females, on the other hand, have very definite 

 types of reactions towards caterpillars. If a female is touched 

 by a moving caterpillar a defensive reaction occurs. She backs 

 away with abdomen bent downward and forward and with 

 sting extended in a threatening attitude. She then approaches 

 cautiously and if the caterpillar moves draws back again. If 

 the caterpillar remains active she may desist, turn about and 

 move away. A similar threatening or defensive response may 

 be called forth occasionally by other moving objects. If the 

 caterpillar is quiet the female will sting it causing it to squirm 

 violently. The wasp retreats to a safe distance until the cater- 

 pillar comes to rest. She approaches again, and again stings the 

 caterpillar which is now unable to react, for its muscles are 

 paralyzed. The reactions of a female wasp toward a paralyzed 

 caterpillar consist in carefully inspecting it with the antennae, 

 penetrating it with the sting, and feeding from the puncture that 

 she has made. 



Oviposition normally follows some time after feeding. Ovi- 

 positing reactions begin with antennal inspection. After a 

 favorable spot is selected, usually between the caterpillar and 

 the glass, the abdomen is extended with sting withdrawn and 

 eggs are laid. The wasp may remain in this ovipositing position 

 for many minutes. 



Injury to antennae, unless very extreme, does not prevent 

 normal reactions toward caterpillars. 



Freak 247. Along with several males and females reared at 

 room temperature in a vial of stock 13 recently derived from 

 crosses of L. stock 5 and I. stock there was found (January 15, 

 1924) an orange-eyed gynandromorph with normal wings and 

 male head, twenty-four joints in each antenna. Abdomen was 

 of normal female type except that first right sternite was male. 

 Ovaries and poison sac were normal and seminal receptacle 

 contained sperm. 



Tests for reactions extended over four days. The gynandro- 

 morph kicked off males attempting to mate, bending its abdomen 

 down slightly to avoid them. It gave positive mating response 

 towards males, flipping wings and running after them but not 



