I 7 8 



Chapter XVI 

 THE HABITS OF ANOPHELINES 



Seasonal Prevalence. We have already shewn how 

 selective the Anophelinae are in their choice of breeding 

 grounds ; consequently, if at any time, e.g., the dry 

 season, a suitable breeding-ground does not exist, a 

 particular species or genus of the Anophelinae may be 

 absent. 



Thus we found in Nagpur (India, C.P.), during 

 the dry season, in those places where shallow puddles 

 had dried up, Mym. rossi was rare, but it abounded 

 wherever puddles still remained. Where weedy lakes 

 existed, Nyss. fuliginosus was common, elsewhere rare. 

 Now these conditions are directly dependent on the 

 rainy season, and where vast areas of weedy swamp are 

 formed during the rains, then M. nigerrimus prevailed, 

 tp disappear when the swamps dried up. In temperate 

 climes, the temperature is, no doubt, an important 

 factor, the onset of the cold weather causing a general 

 hibernation. 



THE HIBERNATION OF ANOPHELINES 



I. Hibernation of the Adult Insects. Annett 

 and Button describe the finding of A. maculi'pennis 

 during the winter in England in cellars, lumber- 

 rooms, and other cold places, but not in stables where 

 the temperature is higher. 



They observed that only females are found, and 

 that these are always fertilized, and have the sper- 

 matheca filled with'spermatozoa. 



The adults of A. bifurcatus do not hibernate, 

 or only rarely. 



