418 



V/Zr WLHK 1\ ^ \UR\L1ST XTJ 



liaich; ihev were presumably destroyed hy y)arasites which failed 

 to mature or to emerge, for from the four non-parasitised egg 

 hatches 155 bug nymphs hatched from 15G eggs. In the case of 

 <«\(M-y parasitized pentatomid egg batch collected at Barstow, 

 'Fexas, or at Tlahualilo, Mexico, no nymphs hatched, showing 

 that in the majority of cases comi)lete destruction results when- 

 e\-er an egg batch of a host species is discovered by its tiny 

 enemies. Of 41 batches collected, 30 or SS% were parasitized 

 In Tilcnomus ashnuadi Tin-, probabh represents more dosely 



the individual eggs. Although the nuiltiplication of tlie host 

 species ap{)ears to be effectively checked by these beneficial insects 

 by midsunnner, the y)entatomid bugs affected have already had an 



