5. Banks of irrigation ditches; these are numerous and 

 covered by grasses and other plants; three tubes placed under 

 bedding of dead vegetation among roots. 



6. Cattle sleeping places on north slopes of hills; lacking 

 vegetation, soil cracks, or stones, but with cattle dimg mixed 

 with loess dust; only place for females is powdered mixture of 

 loess and cow dung; three tubes placed here and one imder an 

 entire cake of cow dimg. 



Results: in tubes in cracks in soil in any situation lar- 

 vae hatched most qviickly (37 to 50 days). Among grass roots 

 in irrigated valleys and meadow steppes, larvae hatched in 68 

 or 69 days. Females in all other situations perished without 

 ovipositing. 



The microclimate of these niches was determined as follows; 



I 



- 874 - 



